From lee.stanford@eclipsys.com Tue Apr 22 19:32:43 1997 Received: by csres2.cropsci.ncsu.edu (5.61-AIX-1.2/1.0) from [192.41.32.161] with SMTP id AA117870 (for rdkeys, from lee.stanford@eclipsys.com/lee.stanford@eclipsys.com); Tue, 22 Apr 97 19:32:43 GMT Received: from smtp.eclipsnet.com ([199.250.158.26]) by eclipsys.com (8.8.5) id NAA09733; Tue, 22 Apr 1997 13:30:53 -0600 (MDT) From: lee.stanford@eclipsys.com X-Authentication-Warning: eclipsys.com: Host [199.250.158.26] claimed to be smtp.eclipsnet.com Received: from ccMail by smtp.eclipsnet.com (ccMail Link to SMTP R6.00.01) id AA861741192; Tue, 22 Apr 97 15:33:53 -0500 Message-Id: <9704228617.AA861741192@smtp.eclipsnet.com> X-Mailer: ccMail Link to SMTP R6.00.01 Date: Tue, 22 Apr 97 12:31:05 -0500 To: Subject: glowbugs digests 26 - 31 Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="simple boundary" Status: O --simple boundary Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Attached files glowbugs digests 26 through 31 --simple boundary Content-Type: text/plain; charset=US-ASCII; name="GLO-POR0.026" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="GLO-POR0.026" GLOWBUGS Digest 26 Topics covered in this issue include: 1) Re: GLOWBUGS by fgilmore@woodtech.com 2) Re: An open challenge.. by Bob Roehrig 3) ADDRESS CHANGE by HAMRLUND@aol.com 4) Re: An open challenge.. by hrsil@flinet.com (Henry Silvia) 5) Low voltage RX plans by johnmb@nando.net 6) Re: An open challenge.. by rdkeys@csemail.cropsci.ncsu.edu 7) Re: 40 and up by rdkeys@csemail.cropsci.ncsu.edu 8) Vernier Dials by Robert Norman 9) Glowbugging on 3535 and 1805 this week by rdkeys@csemail.cropsci.ncsu.edu 10) Re: 40 and up by rdkeys@csemail.cropsci.ncsu.edu 11) Re: An open challenge.. by steve@hi.com (Steve Byan) 12) Re: 40 and up by rdkeys@csemail.cropsci.ncsu.edu 13) Re: 1929 Transmitter by Raymond Sommers 14) Re: '45 Hartley rig from 1932 QST article by rdkeys@csemail.cropsci.ncsu.edu 15) Re: '45 Hartley rig from 1932 QST article by Bob Roehrig 16) Re: '45 Hartley rig from 1932 QST article by x90galbrait1@wmich.edu 17) Re: '45 Hartley rig ... by MICHAEL@ecs.umass.edu 18) Re: '45 Hartley rig from 1932 QST article by rdkeys@csemail.cropsci.ncsu.edu 19) My Hartley articles for your glowbugging enjoyment. by rdkeys@csemail.cropsci.ncsu.edu 20) Re: My Hartley articles for your glowbugging enjoyment. by rdkeys@csemail.cropsci.ncsu.edu 21) FTP Site on-the-air by Conard Murray ---------------------------------------------------------------------- Date: Tue, 21 Nov 1995 17:11:07 -0800 >From: fgilmore@woodtech.com To: broehrig@admin.aurora.edu, Subject: Re: GLOWBUGS Message-ID: <199511220111.AA26782@relay.interserv.com> On Sat, 18 Nov 1995, Bob Roehrig wrote: >On Fri, 17 Nov 1995, BOB LIESENFELD wrote: > >> Hi gang, >> Ok, I'm going to reveal a gapping hole in my knowledge about our >> friend the tube. >> Remember the old tube type car radios? I also remember hearing about >> "battery tubes." So, what ran the plates in these tubes? I can't >> believe that they ran on 12VDC, and can't remember hearing the buzz of >> a vibrator in the old Fairlane, so what gives? >> As a novice back in '69, I bought an old Gonset SW converter for a >> car radio at a hamfest. I asked the guy if he had the power supply for >> it. He said "there isn't one, it uses battery tubes." It was full of >> 12AU7s et al........ >> > >There were a series of tubes designed especially for use with 12 volt >plate supply. This was popular in the early 60's. A lot of the sets were >hybrids too. If I remember correctly most, if not all, of these sets >were hybrids - that is they used tubes in the RF/IF/DETECTOR stages and >the audio was solid state to develop the necessary power. There were >circuits using some of the more common tube types also, but most used >tubes specially designed for low voltage supply. My 1960 Rambler >American had such a radio. >73 de Bob, K9EUI > One of the twenty wonders of the world in the late 50's/early 60's was the Gonset Super Twelve converter. Truly a work of art. 12vdc only. Vast improvement on the earlier ones where you went in and robbed power from the car radio. Right up there was the Blaupunkt/Becker/Grundig/et all German SW converters which I still love and use. 12vdc only. And there was a one obscure, and I do mean obscure, Air Force survival radio that worked the same way. I was issued one in '68 or so throgh AF MARS but I dont know what happened to it or the model. It was in the 30-45 mhz range and the transmitter was very low power of course. Was obviously cold war vintage before the balloon went up in 'nam. Cute little rascal. Was always going to move it up to six and never got around to it. Probably somewhere it's being used that way now. Hi! 73, de Frank K0JPJ ex-W5PVX ...-.- ------------------------------ Date: Tue, 21 Nov 1995 19:21:57 -0600 (CST) >From: Bob Roehrig To: rdkeys@csemail.cropsci.ncsu.edu Cc: Multiple recipients of list Subject: Re: An open challenge.. Message-ID: On Tue, 21 Nov 1995 rdkeys@csemail.cropsci.ncsu.edu wrote: > > > > Why don't we also build a receiver of the period? > > > > A GOOD, regen circuit would be appropriate. Why not start with something > > reasonably simple at first and then go to a Reinartz circuit? I've been > > wanting to build a Reinartz for some time. > > Actually a Reinartz tuner is about as simple as could be made, and > traditionally had only a detector and one-step audio. Anything from > a type 19 to a 30 to a 76 to a 6J5 to a *SN7 to a 12AT7, etc would > work, as well as the original '01A's. See March, 1922 for the original > article and several followups about a year later. Well, fellow GB buffs, I dug out the march 1922 issue of QST and may try building the Reinartz tuner myself. However, there is one thing I would certainly do, and that is to add an RF choke in the detector plate (and add a bypass cap) to keep RF out of the audio circuit. I also noticed that there is no grid leak resistor. Gotta have one. If I build it, I plan to make my own rotary switches as shown in the photo. Should be fun - anyone have any ideas how to make the switch contacts - like maybe grinding down the heads of fairly large bolts? I found a pretty good circuit ( a little more modern ) for a "2-step" regen receiver in an old radio handbook. It is called an "autodyne" receiver and uses a 6J7 as the detector (Hartley type circuit) using a screen pot to control regen. The audio stage is a 6C5. Again, many other tube type could be used. This set looks like it would be a lot easier to build than the Reinartz and more suited to plug-in coils, since only 3 coil connections are necessary. Coil data is given for 80 thru 10 meters. The only thing I don't like about this circuit, as with many early sets, is that the headphone connection is directly in the plate circuit, requiring older, higher impedance phones. I would recommend using an output transformer of some kind. Anyway, if someone wants the article, send a SASE to me and I'll forward a copy - it should be a good one. 73 de K9EUI Bob Roehrig 314 S. Harrison St. Batavia, IL. 60510 ------------------------------ Date: Tue, 21 Nov 1995 20:48:14 -0500 >From: HAMRLUND@aol.com To: GLOWBUGS@theporch.com Subject: ADDRESS CHANGE Message-ID: <951121204812_113297739@mail04.mail.aol.com> Please take note on this address change: NEW ADDRESS IS: HAMMERLUND@USA.PIPELINE.COM ************************************************************** CONTACT: Robert Fowle.....HAMMERLUND@USA.PIPELINE.COM Ph.517-789-6721............................................... 1215 Winifred....Jackson, Mich. 49202-1946 | | ---|---|---> The HAMMARLUND Historian | | Historical Information -- Manuals -- Technical Material ************************************************************** I'm looking for anything by HAMMARLUND: literature --------> spec sheets, sales flyers, sales catalogs files ----------------> from: factory, service stations, authorized dealers manuals ---------> factory or military accessories ----> speakers, clocks, xtals, xtal boxes, anything face plates------> for sp-200/400/600 series' recievers ------------------------------ Date: Tue, 21 Nov 1995 21:10:13 -0500 >From: hrsil@flinet.com (Henry Silvia) To: glowbugs@theporch.com Subject: Re: An open challenge.. Message-ID: <199511220210.VAA08106@ns1.flinet.com> I for one would be very interested in participating in building the '29 trans units, however I have .001percent knowledge of tubes(I am reading here and learning though and I have actually touched the cathode on my ts520s). Second, sources and schematics are not readily avail. unfortunately I was born 30 years to late to accumulate any references. Soooooo, to make a long story short If any one has any building references or shems, pls get in contact with me so I can get on the bandwagon! Thanks, Henry ------------------------------ Date: Tue, 21 Nov 95 21:46:43 EST >From: johnmb@nando.net To: glowbugs@theporch.com Subject: Low voltage RX plans Message-ID: <9511220246.AA12406@merlin.nando.net> In "RADIO FOR THE MILLIONS" (a great book, published by BA-listmember Lindsay Publications... ISBN 1-55918-019-6) has several LV regennies... one using 6v6s at 1-3v on the plates, and another using 6v for a mini broadcast rx. Here's a 3 tube portable shortwave rig, with 2 stages of audio, running off of B voltages of +/-9 and A voltage of 1.5-4.5 volts, using 6sj7s. This is a fun book, with all construction articles taken from Popular Science, with such stuff as an early prototype boom box (a dual turntable portable phonograph that fits into a LARGE suitcase), pole lamp radios, teeny tiny (?!) book lamp/ radios, a home brew tube tester, twin pentode one tube receivers, and all manner of other things. Reprinted by Lindsay Publications, Bradley, IL 60915 (Orig pub, 1945) Best, /john wb5oau/4 ------------------------------ Date: Wed, 22 Nov 1995 00:34:04 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: broehrig@admin.aurora.edu Cc: rdkeys@csemail.cropsci.ncsu.edu (), glowbugs@theporch.com Subject: Re: An open challenge.. Message-ID: <9511220534.AA100898@csemail.cropsci.ncsu.edu> > > On Tue, 21 Nov 1995 rdkeys@csemail.cropsci.ncsu.edu wrote: > > > > > > Why don't we also build a receiver of the period? > > > > > > A GOOD, regen circuit would be appropriate. Why not start with something > > > reasonably simple at first and then go to a Reinartz circuit? I've been > > > wanting to build a Reinartz for some time. > > > > Actually a Reinartz tuner is about as simple as could be made, and > > traditionally had only a detector and one-step audio. Anything from > > a type 19 to a 30 to a 76 to a 6J5 to a *SN7 to a 12AT7, etc would > > work, as well as the original '01A's. See March, 1922 for the original > > article and several followups about a year later. > > Well, fellow GB buffs, I dug out the march 1922 issue of QST and may > try building the Reinartz tuner myself. However, there is one thing > I would certainly do, and that is to add an RF choke in the detector > plate (and add a bypass cap) to keep RF out of the audio circuit. > I also noticed that there is no grid leak resistor. Gotta have one. In that era, the phones represented sufficient choking to work fine. About 1925 or so the use of plate lead chokes and bypasses around the fone leads became standard on detector sets. Later Reinartz sets sometimes had a point marked X in the diagram where a choke could be inserted at the builders discretion. If you are using the typical '01A and cast bakelite socket of the era there is enough current leakage across the socket and the base of the tube to allow about 15-20 megs of false grid leak. Hence, a grid leak is not really required. Only when modern ``low loss'' insulation of the middle 20's and later is used, does that leakage go up to mebbee 100 megs and the use of a grid leak is more or less required at that point. If you have some victoreen 100-1000 meg ohm glass resistors laying around from old electrometers, you can use them in grid leaks and test where the cutoff is. Since I don't have a working saphire insulated vibrating reed electrometer around anymore I am not able to accurately check the typical grid leakage resistance in my sets --- (anyone have a spare Cary 3xx series vibrating reed electrometer with saphire insulated leakage testing head about?). > If I build it, I plan to make my own rotary switches as shown in the > photo. Should be fun - anyone have any ideas how to make the switch > contacts - like maybe grinding down the heads of fairly large bolts? Original switch points are a bit scarce to find these days. Ground down heads are appropriate. There was a hint in an early 20's Radio News or QST to use 22 calibre shell casings as switch points and solder into the casing for the connection. The casings were pushed into the 1/4 inch hard rubber panel drilled slightly undersized. > > I found a pretty good circuit ( a little more modern ) for a "2-step" > regen receiver in an old radio handbook. It is called an "autodyne" > receiver and uses a 6J7 as the detector (Hartley type circuit) using > a screen pot to control regen. The audio stage is a 6C5. Again, many > other tube type could be used. This set looks like it would be a lot > easier to build than the Reinartz and more suited to plug-in coils, > since only 3 coil connections are necessary. Coil data is given for > 80 thru 10 meters. The only thing I don't like about this circuit, > as with many early sets, is that the headphone connection is directly > in the plate circuit, requiring older, higher impedance phones. I > would recommend using an output transformer of some kind. This is a fine circuit, and common in several editions of the ARRL and E&E handbooks up until about 1955 or so (12th edition E&E Hbk.). Use a coupling transformer for headphones if the voltage is over 90 volts or else use impedance coupling through a 10 henry choke and about half to one microfarad coupling capacitor to the fones. 600 ohms or higher fones will work fine in that type of circuit. > Anyway, if someone wants the article, send a SASE to me and I'll > forward a copy - it should be a good one. > > 73 de K9EUI > > Bob Roehrig > 314 S. Harrison St. > Batavia, IL. 60510 > > Go for it! 73/ZUT DE NA4G/Bob ------------------------------ Date: Wed, 22 Nov 1995 00:57:17 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: cfm@tntech.edu (Conard Murray) Cc: rdkeys@csemail.cropsci.ncsu.edu (), glowbugs@theporch.com Subject: Re: 40 and up Message-ID: <9511220557.AA100936@csemail.cropsci.ncsu.edu> > > -- [ From: Conard Murray * EMC.Ver #2.5.02 ] -- > > OK...I figured just about anything would chirp on 40. I did see a neat two- > tube MOPA in a Sept 1925 QST. After listening to your FB sigs, I really > wondered why anyone would run XTAL control. I especially liked the note you > got by reducing the filter on the dynamotor a while back. TNX. A self-excited Hartley can have a good T9 note if care is taken. I don't recall that particular set. I will have to look it up. Look in the 1924 issues for Tom Rives MOPA set from the Signal School. > I did find a decent dyno....28 volts input gives 320 volts at 220 mA. Sounds like a winner. Just remember to keep the total plate capacitance on the dynamotor output down to mebbee 4 mfd or so so that chirp is faster than keying and hence of negligible bother. Some lag to prevent keying thumps (key klicks) is appropriate. Several Henrys of choke in series with the key lead is usually sufficient. Use the minimum necessary. A bit of capacitance up to a couple of mfd across the key lead will sometimes help. The early QST's of the 1925-1930 era always had key thump circuits here and there. Basically it just requires that chirp is so fast as to be negligible while on/off make/break times are rounded (lagged) sufficiently to keep key clicks to a minimum (a millisecond or two of lag is fine). > What sort of coils are you running on your 160 meter rig? Do you think #10 > copper will work ok? I hate to think of the tubing it would take for 160.... > maybe I could distill some white lightning in the tank coil... Anything from no. 14 and larger will work fine. I use mostly no. 14 black in the 500 foot roll for small sets up to 5 watts. Copper tubing is really not needed until powers go up above 5 watts. Going beyond 5 watts, use no. 6 and larger wire or 3/16 to 1/4 inch tubing. Going beyond 75-100 watts, use real plumbers pipe...(:+}}..... Whatever type of coil material is used, make sure the turns are solidly in place and not subject to vibration. Other things such as parts mounting, wire steadiness, power supply stability, etc., are more important at QRP powers. That holds for 160/80/40 meters. Power supply stability under load/noload keydown keyup is probably the most important thing. Grid biasing (feedback tap) is probably the second most important thing. Loose coupling is probably the third most important thing. Tank coil design and heaviness is probably the fourth most important thing. Wire dress and lead firmness is next. Tube selection and electrode stability within the glass envelope is next. Choice of capacitor is next. All else takes a back seat. For coil forms you can use either black plastic hardware store pvc (or whatever the black stuff is) of about 1/8 inch wall (the heavy size) and mebbee 2 inches in diameter or a little larger. Alternatively, use standard AlSiMag cast ceramic forms (1930 and later era). > 73 de Conard ws4s > 73/ZUT DE NA4G/Bob ------------------------------ Date: 21 Nov 1995 23:00:08 -0700 >From: Robert Norman To: Subject: Vernier Dials Message-ID: <"RZ5630 95/11/22 06:00:08.923338"@WACCVM.CORP.MOT.COM> Date: 11-21-95 23:00 >From: rz5630@waccvm.corp.mot.com (Robert Norman) To: glowbugs@theporch.com Subject: Vernier Dials I am looking for Vernier dials that could be used as "main tuning" dials for home made receivers. I would really like to find some Planetary Drives as well. I think there was a real fine Vernier Dial mechanism made in England that was popular in the early thirties and later I think the name was Eddystone. I have a nice 6 inch Millen dial but would like to have one with a greater ratio than the Millen has. It is a 5:1 ratio dial. If anyone can steer me in the right direction towards a nice vernier dial I would appreciate it very much. Thanks ahead of time. Bob ARS K7NWB rz5630@waccvm.corp.mot.com 602-413-4508 work 602-833-7786 home ------------------------------ Date: Wed, 22 Nov 1995 02:08:40 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: glowbugs@theporch.com Cc: rdkeys@csemail.cropsci.ncsu.edu () Subject: Glowbugging on 3535 and 1805 this week Message-ID: <9511220708.AA100306@csemail.cropsci.ncsu.edu> If anyone is interested in glowbugging over the next few days, I will try to be on each evening with the Hartley twins as follows...... QTR QRG RIG --------------- --------------- ------------------------------------- 0400Z nightly 3535khz '10 1929 Style Hartley at 2w 0500Z nightly 1805khz 6SN7 Glowbug 1932 George Grammer Style Hartley Rallye rig at 2w Anyone is welcome to join in and give a signal report and comments. Run whatever rig you can muster up, but special considerations will be held out for them thar firebottle Hartley style glowbugs about the ether.....(:+}}...... I will call on the half kw RMCA ET-8019A to establish the QSO and then change to the Hartley(s). I will call CQ GLOWBUGS DE NA4G K from about on the hour to about 5 minutes after, +- QRM. 73/ZUT DE NA4G/Bob ------------------------------ Date: Wed, 22 Nov 1995 10:58:32 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: cfm@tntech.edu (Conard Murray) Cc: rdkeys@csemail.cropsci.ncsu.edu (), glowbugs@theporch.com Subject: Re: 40 and up Message-ID: <9511221558.AA100519@csemail.cropsci.ncsu.edu> > > -- [ From: Conard Murray * EMC.Ver #2.5.02 ] -- > > Hi Bob...Thanks for all the info... I printed that one out for sure. Will > get started on something this weekend after the smoke clears from > Thanksgiving. I haven't used a regen in awhile... I have a National RBL in > my dad's attic (my old shack) that I used to monitor the marine band with... > besides that, I guess i haven't got much experience with regens. All the > rcvrs I have built with sandbox parts have been DC or simple supers. Do you > think a decent rig could be built along the lines of the small qrp sandboxes > ..? I am thinking of something like this... > > MO------PA------| > | X-------ANT > |------DET------| > | > Audio amp > | > headphones OH BOY! You have brought up a very interesting topic that I am sure will frag the heads off the young squirts on the block that think receivers called Direct Conversion are ``new technology''.....(:+}}..... The above design is quite workable, in fact. If the MO runs continuously (not really good for tubes larger than 5 watters but doable with them) then of course one can take an injection signal off of the MO to use as a ``heterodyne receiver''. For the young squirts amongst us, a heterodyne receiver was first used about 1907 using both buzzers and arcs to inject signals into a crystal detector. If my memory is correct, it was Valdemar Poulsen working with the ``singing arc'' that later became his regular arc converter (you know, that radio transmitter made from carbon arc lamp electrodes, etc running up to 100kw that became the basis for UCBerkeley's first cyclotron) that first discovered the heterodyne principle where a radio signal could be heterodyned to audio directly. Modern folks call that direct conversion. The proper terminology is ``heterodyne detection'' using ``external heterodyne oscillators'' or ``autodyne oscillators [read Armstrong's regernerator]. The principle works absolutely magnificently and can be amply demonstrated by taking either a crystal set or a regenerative detector just under the verge of oscillation and loosely coupling something like a BC-221 or LM freq meter to the antenna lead and letting the freq meter do the ``external heterodyne'' signal injection. The major problem of using the MO as the signal source for ``heterodyne'' detection is that it is necessary to slightly offset the MO so that an audio tone will result in the receiver audio output. That requires something like an FSK in reverse. Oftentimes the loading of the oscillator under keying will pull it sufficiently to allow the offset to occur automatically. If not, then you have to add a touch of FSK in some way to make things work properly. I used the BC-221 technique with the RAL regenerator at field day about 10 years ago to overcome adjacent fundamental overload problems from the silly sideband folks. It cleared the problem up very well. [FYI the ol BC-375 was the companion transmitter at the time.] For more info, look at Elmer Bucher's ``Practical Wireless Telegraphy'', 1917 edition, pages 278-281. Also see Mary Loomis' ``Radio Theory and Operating'', 1925, pages 334-338. Also there are Armstrong's original patent drawings and Lee DeForest's notebook drawings from 1912. I invite all glowbug folks to try it out! > These peanut tubes I have would be ideal for this sort of thing. I don't > remember seeing a tube version of a DC receiver. I can't think of any reason > that the DC scheme wouldn't work unless I would need more gain in the audio > stage that I could get from a single stage. Maybe I could use the PA as a RF > amp on rcv too....gee, next thing I know this rig will be a kwm-2! Works fine! > Have a good holiday! > 73 de Conard ws4s > > All else takes a back seat. Likewise, you and all the Glowbug folks do have a happy holiday and I will hope to QSO many of you over the next few days on 3535[0400Z] or 1805[0500Z]. 73/ZUT DE NA4G/Bob ------------------------------ Date: Wed, 22 Nov 1995 10:43:32 -0400 >From: steve@hi.com (Steve Byan) To: glowbugs@theporch.com Subject: Re: An open challenge.. Message-ID: >Original switch points are a bit scarce to find these days. If Modern Radio Labs is still in business, they will have switchpoints and levers. Don't have the address handy; if Bobbi is on Glowbugs, she might be able to supply it. Regards, -Steve Steve Byan internet: steve@hi.com Hitachi Computer Products (America), Inc. 1601 Trapelo Road phone: (617) 890-0444 Waltham, MA 02154 FAX: (617) 890-4998 ------------------------------ Date: Wed, 22 Nov 1995 11:12:35 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: cfm@tntech.edu (Conard Murray) Cc: rdkeys@csemail.cropsci.ncsu.edu (), glowbugs@theporch.com Subject: Re: 40 and up Message-ID: <9511221612.AA100557@csemail.cropsci.ncsu.edu> Continuing the ``external heterodyne detection'' receiver gambit..... See also Duncan and Drew, ``Radio Telegraphy and Telephony'', 1931, pages 364 through 366, for more details and tube circuits. Their circuit should be quite workable to simple MOPA rigs for signal injection. Bob/NA4G ------------------------------ Date: Wed, 22 Nov 1995 10:10:14 -0600 (CST) >From: Raymond Sommers To: rdkeys@csemail.cropsci.ncsu.edu Subject: Re: 1929 Transmitter Message-ID: The April 1976 issue of Ham Radio had an article by Bill Orr entitled 1929-1941 the golden years of amateur radio. It also described a simple transmitter using the type 45 tube. The original article about the transmitter was in the March 1932 issue of QST. I built one of these in 1977 and I think I made one contact with it. It tuned from 3.5 to 4.0 MHz but was a bit unstable being built on a breadboard and the tube socket was sort of springy and ... Any vibration or moving your hand over it caused a shift in frequency. I can't give any more details since I have not been active in over ten years until just recently and have to start learning all this stuff over again. Anyway the article may be more accessable in Ham Radio than in the old QST. _ _ __, _, _, _,_ _, | | |_) (_/ | |_/ / ` |/\| |_) / the | ,ittle | \ ilowatt \ , uster (Wisc.) ~ ~ ~ ' ~~~ ~ ~ from ~ Ray Sommers, WB9LKC (QRP) rsommers@worf.uwsp.edu ------------------------------ Date: Wed, 22 Nov 1995 12:07:08 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: owens@stout.atd.ucar.edu (Chip Owens) Cc: rdkeys@csemail.cropsci.ncsu.edu (), glowbugs@theporch.com Subject: Re: '45 Hartley rig from 1932 QST article Message-ID: <9511221707.AA100634@csemail.cropsci.ncsu.edu> > > Hi Bob, > > Can you recommend a substitute for the type 45 tube used > in the 1932 QST article mentioned in previous postings? > > I built that transmitter about ten years ago but set it > aside when I found that my only '45 was dead. I'd like to > find something that would just plug in the same socket in > place of the '45. This would be used until another '45 > can be located. I can't give you an exact sub for the 45 that would just drop in. I use the 6SN7 for low power work. The 801 or '10 is a good sub, but I don't remember right off if the plate and grid pins are reversed. If not, then just jack the filament voltage up to 6.0-7.5 vdc/vac and away you go. I could recommend a 24G or 3C24 as a pretty good sub. Along similar veins, any of the Heintz and Kaufmann, Taylor or Eimac small triodes such as the 35T or even as large as the 75T would work, as long as you were careful not to push the circuit too much and start heating and yooping up and down the band. On 160 meters, that really is not too much of a problem. STABLE POWER SUPPLIES is perhaps the number one concern at that QRG. I could recommend a 811 as a pretty good sub (just keep the voltage down so you don't run over mebee 10 watts or so.....(:+}}.....). In fact, I may try both the 24G and 811 in mine tonight if I get home in time to do some quick socket changes. I don't remember right off whether the grid on the 811 is set up as it is to the same pin as on the 45. Check before applying power. If things match up and the filament pins are assumed to be the biggie pins then the 24G can sub directly (but needs 6.0vdc/vac at 3.0amps) by just plugging in and clipleading to the grid and plate from the socket pins using short stiff clipleads. In the case of the 811, IF the grid matches the 45 grid, then just use one cliplead up to the platecap from the 45 socket plate pin, and use 6.0vdc/vac at 4.5 amps to run the filament. Anyone have a book handy to check the basing on the '45, 801, 24G, 811? > Some holiday QSO's with the breadboard rigs and low power on > 160m would be great fun. I've got a 3/8 wavelength inverted-L > with counterpoise that works passably on 160. On 3.5Mc it works > as a 3/4 wavelength antenna with an additional 20ft. or so of > wire that I add to the end. I'll listen on the Glowbug freq/time > to see if I can hear some activity out here in Colorado. > > '73, Chip Owens, NW0O > Boulder, CO > owens@stout.atd.ucar.edu > I have worked Colorado easily on 25 watts, so my guess is you should hear something. On 80, I worked as far as Dallas on 2 watts, so that should also be fine. I will establish the QRG with ``Big Bertha'' and then we can set about a' Hartleying for the season.....(:+}}..... Grt to hve yu abd fer da run...... 73/ZUT DE NA4G/Bob ------------------------------ Date: Wed, 22 Nov 1995 11:22:01 -0600 (CST) >From: Bob Roehrig To: rdkeys@csemail.cropsci.ncsu.edu Cc: Multiple recipients of list Subject: Re: '45 Hartley rig from 1932 QST article Message-ID: On Wed, 22 Nov 1995 rdkeys@csemail.cropsci.ncsu.edu wrote: > > Anyone have a book handy to check the basing on the '45, 801, 24G, 811? > The basing on the 45 and 801 are the same. The 811 is same except the plate is on the cap rather than pin 2. The 24G has the same filament pinout as all the others (1 & 4) but both grid and plate are caps. So you can plug any of them into the same socket, applying the correct filament voltage and making corrections for grid/plate. 73 de Bob, K9EUI ------------------------------ Date: Wed, 22 Nov 1995 12:32:26 -0500 (EST) >From: x90galbrait1@wmich.edu To: Bob Roehrig Cc: Multiple recipients of list Subject: Re: '45 Hartley rig from 1932 QST article Message-ID: On Wed, 22 Nov 1995, Bob Roehrig wrote: > On Wed, 22 Nov 1995 rdkeys@csemail.cropsci.ncsu.edu wrote: > > > > > Anyone have a book handy to check the basing on the '45, 801, 24G, 811? > > > > The basing on the 45 and 801 are the same. The 811 is same except the > plate is on the cap rather than pin 2. The 24G has the same filament > pinout as all the others (1 & 4) but both grid and plate are caps. > > So you can plug any of them into the same socket, applying the correct > filament voltage and making corrections for grid/plate. > > 73 de Bob, K9EUI Speaking of which, anybody got any 'spare' 10s or 45s (or 801s if they would work in the same circuit)?? This project would be fun if it could be done with those neat ol' triodes. I could trade for other bottles... 73, Chris KA8WFC ------------------------------ Date: Wed, 22 Nov 1995 12:49:02 -0500 >From: MICHAEL@ecs.umass.edu To: GLOWBUGS@THEPORCH.COM Subject: Re: '45 Hartley rig ... Message-ID: <01HXY0BHIA9C8ZE38F@ECS.UMASS.EDU> >Speaking of which, anybody got any 'spare' 10s or 45s (or 801s if they >would work in the same circuit)?? This project would be fun if it could >be done with those neat ol' triodes. I could trade for other bottles... Those 45s are going for 30-50 bucks a pop these days, Chris. The toob phreaks discovered them, though what they want with a tube with a 2 watt rated output is beyond me. Let's leave the remainder for those old Philco cathedrals, I say. Just my .02 for the day. John Michael michael@ecs.umass.edu ------------------------------ Date: Wed, 22 Nov 1995 13:30:07 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: x90galbrait1@wmich.edu Cc: glowbugs@theporch.com Subject: Re: '45 Hartley rig from 1932 QST article Message-ID: <9511221830.AA100948@csemail.cropsci.ncsu.edu> > On Wed, 22 Nov 1995, Bob Roehrig wrote: > > On Wed, 22 Nov 1995 rdkeys@csemail.cropsci.ncsu.edu wrote: > > > > > > Anyone have a book handy to check the basing on the '45, 801, 24G, 811? > > > > > The basing on the 45 and 801 are the same. The 811 is same except the > > plate is on the cap rather than pin 2. The 24G has the same filament > > pinout as all the others (1 & 4) but both grid and plate are caps. > > So you can plug any of them into the same socket, applying the correct > > filament voltage and making corrections for grid/plate. > > 73 de Bob, K9EUI > > Speaking of which, anybody got any 'spare' 10s or 45s (or 801s if they > would work in the same circuit)?? This project would be fun if it could > be done with those neat ol' triodes. I could trade for other bottles... > 73, Chris KA8WFC Go easy on the '10's and '45's folks for just playing unless you are relatively serious about the gambit. I would suggest alternate tubes for play use and keep your originals for show and tell. That is why I opted for the *SN7 over the 45 in my rehash of Grammer's 1932 work. It is as common as the fallen leaves this time o' year. The ol' 2A3/6A3 is also a dropin for the '10, as is the '01A. But these are also getting a bit scarce on the shelf stock. The 811 should make a fine sub for any of the triode Hartley style rigs, AND, since it is a plug and play for the standard '10 style triode (excepting the need for a short stiff jumper up to the plate cap on the 811), it will serve well, and is still being made in sufficient quantities to allow a lot of playing to be done. The 812's are also quite good and still relatively cheap. The 572's after pulling from service in linears can make great firebottles for Hartley use......, etc., even so far as the ol' BCST 833's (Right ON Steve Linscott with his 833A regenerator!). I am still working on getting the right set of parts to make a goodly panel style 833 rig based upon the classic RMCA ET-3628 marine rig [a rebuild of the earlier American Marconi P-8 2kw panel marine spark set]. Mebbee T.O.M. will find some stocking stuffers this December to complete the job.....(:+}}.... We can all dream, right? When T.O.M. brings the young squirt over to the shack fer a fine round o' elmerin', then pull the 811 and drop the '10 back in for show and tell.... making sure you use a nipple-headed globular ceramic based or brass based version (scarce as hen's teeth)..... Now, as to generic Hartleying, I still think the indirectly heated dual triodes are great playthings. Of the lot, the 6N7 is the best, but the 6SN7 series will do for most things. One might also try things like pulled 6DQ6's or 6146's and their brethren wired in triode fashion. Sounds like some great clone triodes for a' Hartleying. 73/ZUT DE NA4G/Bob ------------------------------ Date: Wed, 22 Nov 1995 15:57:02 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: glowbugs@theporch.com Cc: rdkeys@csemail.cropsci.ncsu.edu () Subject: My Hartley articles for your glowbugging enjoyment. Message-ID: <9511222057.AA101147@csemail.cropsci.ncsu.edu> I put up my rehacks of the 1932 and 1946 1 tube glowbugging rigs on the Glowbugs home archive machine --- 149.149.11.72. You are welcome to them. The files are gg*.* and bb*.*. 73/Bob ------------------------------ Date: Wed, 22 Nov 1995 16:01:34 -0500 (EST) >From: rdkeys@csemail.cropsci.ncsu.edu To: rdkeys@csemail.cropsci.ncsu.edu (rdkeys) Cc: rdkeys@csemail.cropsci.ncsu.edu (), glowbugs@theporch.com Subject: Re: My Hartley articles for your glowbugging enjoyment. Message-ID: <9511222101.AA101175@csemail.cropsci.ncsu.edu> > > I put up my rehacks of the 1932 and 1946 1 tube glowbugging rigs on > the Glowbugs home archive machine --- 149.149.11.72. You are > welcome to them. > > The files are gg*.* and bb*.*. > > 73/Bob Forgot to mention that they are postscript printer files for printing ONLY on postscript printers. For those that can't do that, I can send via sase with 4 units of postage for both articles. Bob ------------------------------ Date: Wed, 22 Nov 1995 16:40:54 -0500 >From: Conard Murray To: Multiple recipients of list Subject: FTP Site on-the-air Message-ID: <01HXY8FMGKXE9D8BBA@tntech.edu> -- [ From: Conard Murray * EMC.Ver #2.5.02 ] -- Hello all... I am making the FTP server on my machine here at work public for glowbug use . It is located at 149.149.11.72. Bob, NA4G, has already put some really nice stuff on there and I have added a few things too. Feel free to drop by and take what you want and leave a few things if you want. This is the FTP server that comes in WinQVT and it isn't too great, but the price is right. Y'all have a good Thanksgiving and get cracking on the Hartley rigs! 73 de Conard WS4S ------------------------------ End of GLOWBUGS Digest 26 ************************* --simple boundary Content-Type: text/plain; charset=US-ASCII; name="GLO-POR0.027" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="GLO-POR0.027" GLOWBUGS Digest 27 Topics covered in this issue include: 1) SX-28 WITH PM-23 FS by hammerlund@usa.pipeline.com (ROBERT FOWLE) ---------------------------------------------------------------------- Date: Wed, 22 Nov 1995 21:27:53 -0500 >From: hammerlund@usa.pipeline.com (ROBERT FOWLE) To: GLOWBUGS@THEPORCH.COM Subject: SX-28 WITH PM-23 FS Message-ID: <9511230227.AA09232@> Working, but chasis needs to be dusted, alignment appears to be close, but you may want to touch it up. also have the PM-23 speaker to go with it. also have copy of manual. Asking $250 + shipping -or- will consider R-390-A with top & bottom covers in trade, prefer EAC but, all considered. thank you -- ROBERT BENJAMIN FOWLE / the HAMMARLUND historian ------------------------------ End of GLOWBUGS Digest 27 *************************  --simple boundary Content-Type: text/plain; charset=US-ASCII; name="GLO-POR0.028" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="GLO-POR0.028" GLOWBUGS Digest 28 Topics covered in this issue include: 1) Re: An open challenge.. by mjsilva@ix.netcom.com (michael silva) 2) FTP Site on-the-air by ralph.hartwell@emachine.com (Ralph Hartwell) ---------------------------------------------------------------------- Date: Thu, 23 Nov 1995 22:43:53 -0800 >From: mjsilva@ix.netcom.com (michael silva) To: glowbugs@theporch.com Subject: Re: An open challenge.. Message-ID: <199511240643.WAA20547@ix11.ix.netcom.com> Steve Wilson wrote: > >I would think 1939 might be a better year. Not much of a selection >on available tubes from 1929. To me '1929' refers to the style of circuitry (regens and non-xtal transmitters) rather than the tubes used. My '1929' setup will be all octal tubes, since that's what I have. I do also plan to put together some '1939' gear, i.e. a superhet and a rock-bound MOPA transmitter. In fact, I've still got the IF transformers that I ordered in '72 as a high-school kid before other high-school pursuits (and I use the term advisedly) took precedence. I've been away a few days and I took along a recently-acquired 1931 handbook for my reading material. There is quite a lot of information in there - much more than I could digest in a couple of days. My general impression is that they really did have the fundamentals down by then, unlike, say, 10 years earlier. Some of that impression may be due to the more modern terminology, but not all. 73, Mike, KK6GM ------------------------------ Date: Fri, 24 Nov 1995 04:41:00 GMT >From: ralph.hartwell@emachine.com (Ralph Hartwell) To: glowbugs@theporch.com Subject: FTP Site on-the-air Message-ID: <9511240143424901@emachine.com> CM>-- [ From: Conard Murray * EMC.Ver #2.5.02 ] -- CM>I am making the FTP server on my machine here at work public for glowbug use CM>. It is located at 149.149.11.72. Bob, NA4G, has already put some really Conard, Is your site available by Email FTP? I know some folks don't have fill internet access, just message capability. If not, I have an Email FTP server here and I'd be happy to put up the archive files also. They would also be downloadable by regular BBS access through my board. Ralph W5JGV --- ~ QMPro 1.53 ~ Always remember, to copy a disk is not to Xerox it. ------------------------------ End of GLOWBUGS Digest 28 *************************  --simple boundary Content-Type: text/plain; charset=US-ASCII; name="GLO-POR0.029" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="GLO-POR0.029" GLOWBUGS Digest 29 Topics covered in this issue include: 1) 3A4 Receiver by k7yha@ix.netcom.com (Richard H. Arland ) 2) GB: AB4EL could provide WEB archives by nwqrp@scn.org (SCN User) 3) 1937 Hammarlund Short Wave Manual by "Tony Stalls (K4KYO)" 4) Another Water-Cooled 6L6 Story by "Tony Stalls (K4KYO)" 5) 1AD4 20 Meter Receiver by Chris Sieg ---------------------------------------------------------------------- Date: Fri, 24 Nov 1995 16:28:11 -0800 >From: k7yha@ix.netcom.com (Richard H. Arland ) To: glowbugs@theporch.com Subject: 3A4 Receiver Message-ID: <199511250028.QAA13907@ix10.ix.netcom.com> Well, gang, I finally got the thing assembled and working (?), sort of..... The regen action was not smooth and sensitivity was very low. Cud hear the big SW BCST stations but no ham activity. The 40 mtr band was very narrow compared to the 80 meter band (80 was at the low end of the tuning range of the cap). So, I removed about 4 turns from the main coil and added a tap at the grounded end (up 1 turn) to reduce loading effects of the antenna. Then IT happened: I lost the tube filaments. Checked the tube on a checker and it would not respond. Called Antique Radio Supply and they said since the tube was under $5 that they would send me a new one free and I did not have to return the bad tube! Now that is customer service! Awaiting the new 3A4 and will provide more info on how this puppy is playing as soon as I get the tube installed and find a spare minute to fire it up. 73 to all es hp u all had a gud T-day. rich K7YHA ------------------------------ Date: Fri, 24 Nov 1995 17:35:56 -0800 >From: nwqrp@scn.org (SCN User) To: shimshon@theporch.com, glowbugs@theporch.com Subject: GB: AB4EL could provide WEB archives Message-ID: <199511250135.RAA05849@scn.org> Glowbugs Gang and Steve, AB4EL: Thanks, Steve, for offering to archive the glowbugs list to an ftp site and provide WEB links to those archives. This will be an important service and I'm sure I speak for the rest of the glowbugs recipients when I say "TU". However, the final "GA" should be given by the list manager, who I kindly ask to write to Steve about this issue. His address is: shimshon@theporch.com . He can give you the latest information on how to subscribe and can pass along whatever archives may already exist. In fact, he may reveal that WEB access to the glowbugs archives may already exist. I don't know. I have all glowbugs messages except for 11/17/95, which I lost accidentally. By the way, when this gets going, I hope to put a link to the glowbugs archives on thenew Homepage of the NWQRP (see below). Ob GB: Just finished putting up new 80m dipole with my partner KC7MCW, Marcia. Now I will be ready when I finish my 2x 6AQ5 regen rx and 2E24 xtal tx this month. Wish me luck! --Brian, KV9X -- i NorthWest QRP Club __________ -=[scn]=- --0---/\-- )|( nwqrp@scn.org /^\^\/ ^^\ /_|_\ http://www.scn.org/IP/nwqrp/nwqrp.html --NW QRP-- ------------------------------ Date: Fri, 24 Nov 1995 23:36:57 -0500 (EST) >From: "Tony Stalls (K4KYO)" To: GLOWBUGS Subject: 1937 Hammarlund Short Wave Manual Message-ID: A while back, I bought a reprint of the 1937 Hammarlund Short Wave Manual from Antique Electronic Supply. It was everything I had hoped it would be and I thoroughly enjoyed reading the articles and considering trying the old projects. One article that was particualrly interesting was about a little one-tube (VT-30) breadboard receiver project called "A Boy Scout's S.W. Receiver". There was a photograph with the article of "Scout Robert Crocket of Pelham, New York" in his uniform and wearing his headphones, listening to his receiver. I was curious about the what ever became of Scout Crockett, so decided to look for him and found someone I thought might be him in the amateur databases, so I dropped a note off to him. I received a reply that said in part: "Many thanks for your letter, and indeed I am the same person that you noted in the Hammarlund short wave manual. Congratulations on your being able to track me down. "The article was first written up in an issue of Radio News. I had put this set together with the help of my father, who constructed the breadboard, and couldn't figure out why it didn't work. I took it to Larry Cockaday who was a neighbor and editor of the magazine. He promptly reversed the tickler coil winding, and solved the problem. "Soon after the foregoing saga I became a licensed ham (W2IMP), went to college, came out of WWII alive, and moved to the Boston area." And so on... More living history! Isn't it great?!!! 73, Tony K4KYO ------------------------------ Date: Sat, 25 Nov 1995 00:09:57 -0500 (EST) >From: "Tony Stalls (K4KYO)" To: GLOWBUGS Subject: Another Water-Cooled 6L6 Story Message-ID: W3HQG was telling me today about his having gotten his first ticket in the late 1930's and used a "pushed" metal 6L6 inverted in a glass of water to keep it cool. He said that it warmed up the water pretty quickly. Isn't it funny that I've heard several stories over the years about 6L6's having been inverted in water, but no other types. Why do you suppose that is? 73, Tony K4KYO ------------------------------ Date: Sat, 25 Nov 95 17:04:28 PST >From: Chris Sieg To: glowbugs@theporch.com Subject: 1AD4 20 Meter Receiver Message-ID: Hi folks, I spent the last week of evenings putting together a receiver based on the 1AD4 peanut tube. The design is a conventional superhet with a ladder type xtal filter. I didn't bother with a final audio stage since I have a Bogen push pull 6V6 job on the bench. The receiver went toge ther very easily using ugly style construction and a case made out of PC board stock. I didn't use any strange parts, everything is commomn junk box stuff. The performance is quite good, very sensiti ve and quiet. The 1AD4 seems to shine as a VFO because it doesn't generate much heat, the drift at turn on is very minor. Anyway, if anyone is interrested I'd be happy to fax the schematic or send it for a SASE. 73's -Chris ------------------------------------- Name: Chris Sieg WA3LDI E-mail: c_sieg@mail.conknet.com (Chris Sieg) Date: 11/25/95 Time: 17:04:28 ------------------------------------- ------------------------------ End of GLOWBUGS Digest 29 *************************  --simple boundary Content-Type: text/plain; charset=US-ASCII; name="GLO-POR0.030" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="GLO-POR0.030" GLOWBUGS Digest 30 Topics covered in this issue include: 1) Making tube test sockets by mjsilva@ix.netcom.com (michael silva) 2) Tuning up the 3A4 Rcvr by EricNess@aol.com 3) GB: 80m QRP 2x5784WB 3.57Mc by lbbarley@southwind.net (Bruce Barley) 4) Re: Tuning up the 3A4 Rcvr by mjsilva@ix.netcom.com (michael silva) 5) RE 2X5784 Color Burst by Chris Sieg 6) Re: Tuning up the 3A4 Rcvr by Bob Roehrig ---------------------------------------------------------------------- Date: Sat, 25 Nov 1995 19:23:43 -0800 >From: mjsilva@ix.netcom.com (michael silva) To: glowbugs@theporch.com Subject: Making tube test sockets Message-ID: <199511260323.TAA14655@ix6.ix.netcom.com> Hi all, I tried an experiment I've been thinking about, and it worked out well enough that I thought I'd share it. I realized that I needed some tube sockets set up for prototyping, a-la the screw-terminal relay sockets, but more convenient. What I came up with is as follows: (1) Pick up a pair of 1/4" by 2.5" springs, and cut each one into 4 pieces. (2) On one end of each piece bend a loop out 180 degrees. On the other end bend a loop out 90 degrees. (It helps to hold the spring on a screwdriver while bending with needlenose). (3) Cut a 2-inch square of PCB material (single-sided OK). (4) Use a Dremel with cutting wheel to cut 4 lines through the center of the PCB, dividing the surface copper into 8 wedges (make the cuts wide enough to handle the expected voltages, and shallow enough not to weaken the PCB material). Also isolate the 4 corners and drill mounting holes there. (5) Bend out the pins of a PC-mount octal socket, center the socket on the PCB, and tack-solder just one pin to hold the socket in place. (6) At each pin, place the 180 degree loop under the pin (just to hold it), and solder pin and spring to PCB copper. That's it. Mount the socket to your breadboard of choice and attach wires to the springs by pushing on the 90 degree loop to open the spring and slip the wire between the turns. 73, Mike, KK6GM ------------------------------ Date: Sun, 26 Nov 1995 00:49:40 -0500 >From: EricNess@aol.com To: glowbugs@theporch.com Subject: Tuning up the 3A4 Rcvr Message-ID: <951126004939_34049102@emout05.mail.aol.com> The turkey day break has given me some time to work on improving the performance of the "Red Hot" 3A4 receiver. Although I'll never be 100 percent pleased with the performance, I think I've reached 90 percent. Since my last post, I've made a few more changes that make a big difference. First of all, I 've settled on a tickler of 5 turns. The 7 turns shown in the article is definitely too much. Secondly, I added a jumper directly from the frame of the tuning cap to the tuning coil to eliminate loss in the chassis. Finally, I increased the grid leak resistor to 4.7 Meg (50 pF cap). At this point, the only think I think I'll play with is the grid leak to see if I can improve the sound quality a bit on AM signals. So now I guess it's time to start thinking about my next project. Does anybody have a schematic for a high performance two or three bottle regen receiver with enough volume to drive a speaker? 73's, Eric WD6DGX ------------------------------ Date: Sun, 26 Nov 1995 00:26:29 -0600 >From: lbbarley@southwind.net (Bruce Barley) To: glowbugs@theporch.com Subject: GB: 80m QRP 2x5784WB 3.57Mc Message-ID: <199511260626.AAA20063@onyx.southwind.net> Well, Gang - A few postings ago, and before losing my hard drive in a most spectacular crash, I picked up a couple of 5784 pencil tubes from the guy in Millsboro,New Hampshire who was giving some away on the list. I still have his mailing address, but lost his name and I'net address in the crash. Anyway, he sent a schematic to use a couple of those tubes in a 80m rockbound QRP rig. I would probably have converted to a VFO circuit from my '65 Radio Amateur's Handbook I got for $4 {yes. $4.00 - NEW} back when I was in high school. But I just happened to have a really unusual 3.57 rock to put with those pencil tubes. It is labeled MIDLAND part# 1107576-1 {sound like an old Sears part#, anyone?) and looks to be dated August '68. What makes it so unique is that it is mounted in a 7-pin miniature glass tube housing (T5-1/2) about the size of a 6AL5. The crystal itself is a round wafer about .5 inch dia. by looks to be about .02 thick with silvered contacts- one on each side of the wafer- and gripped by two small ring-end (platinum?) wires bonded to riser posts. I worked on a lot of TV's back in the mid 70's, but never found a color burst crystal in a glass vacuum tube shell. Back in '68 and in the era of the round 22 inch sulphide CRT's it might not be totally out of the relm of the expected to find a crystal mounted this way, but this one is the only one I've ever seen like it. They did a lot of crazy things back then. {Remember the parallel 6LB6's running the old Motorola horiz output?) Now, to start with the power supply, first. I think I've got a transformer that will work. And 6X5 rectifier and an 0B2 regulator will look just great on a breadboard next to that crystal and those pencil tubes. Want to keep it all hollow state. These particular pencil tubes take over 100 V on the plate and screen grid with 6.3 volt indirectly heated cathodes. Plate is rated at 1.7W diss. and up to 5.2 ma. I could even get fancy, and drop a small meter circuit into the final. Peak the grid, dip the plate... Yeah. That's it. With my work schedule, I know it won't be just tomorrow, or the day after. But, I do want to get this built and on the air! Anyone else on the list get these tubes and actually have any plans for them? I'll post from time to time and let you know how it's going! '72 & '73's from Kansas - {Yes, Virginia. There is QRP even in Kansas.} Bruce - KB0PZD lbbarley@southwind.net ------------------------------ Date: Sat, 25 Nov 1995 22:56:52 -0800 >From: mjsilva@ix.netcom.com (michael silva) To: glowbugs@theporch.com Subject: Re: Tuning up the 3A4 Rcvr Message-ID: <199511260656.WAA27593@ix10.ix.netcom.com> Eric Ness wrote: <...> >So now I guess it's time to start thinking about my next project. >Does anybody have a schematic for a high performance two or three >bottle regen receiver with enough volume to drive a speaker? Eric, congrats on mastering your "red hot" project. And some people say you don't learn anything building from plans! The regen I'm going to tackle over the holidays is the two-tube rig that's in '40s E&E Radio Handbooks. I know somebody else on the list has also mentioned this set. It uses a 6J7 pentode detector followed by a 6J5 triode driving phones. You could try putting a 6SN7 (which is just a twin 6J5) in place of the 6J5 for two stages of audio, or do the same thing with one of the triode-pentode combinations. I can mail the schematic to you (or anybody else who'd like it) if you're interested. Just let me know. In fact, if anybody is interested, I have a duplicate copy of the 13th edition Radio Handbook (1951), which includes the above receiver and 700+ pages of other tube goodies. I'd sell it for what I paid for it -- $15, plus a buck or two shipping. Lots of fun reading! 73, Mike, KK6GM ------------------------------ Date: Sun, 26 Nov 95 10:42:17 PST >From: Chris Sieg To: glowbugs@theporch.com Subject: RE 2X5784 Color Burst Message-ID: Hi Bruce, Glad to see you received the tubes. I built a 8 tube receiver with the other st yle tubes that I have the 1AD4's. I plan to design a superhet with the 5784 next week some time. T he dual control aspect of the tube has some interesting possibilities. Any way, the 1AD4 receiver was designed for 20 meter CW and worked real well. The VFO was very stable and with a suitable buffer would make a good 80 meter VFO for the 5784 transmitter. Below is a schematic (aren't ASCII schematics a pain!!) for the VFO: 1 Meg B+ /\/\/\/\ | | | | || | | | || | T1| ___________|___||___| | | || | ||( | || |______ ||( T1 WOUND ON T50-2 CORE | .001 )||( PLATE WINDING 44 TURNS | )||( GRID WINDING 8 TURNS | )||( | ____)||( | | . ||( 10 Pf|| | | ||( __||___ OUT | __|__ |. | || | | | | | | || | .01|| | | | |___________|________________ | ____||__ 1| | | | | __|_ || | _____ | | | | | | | || | 1AD4 | | | | | | | | ------- 30pF | | ^ | | | __|__ __|/_ | | B+ ___/\/\/\/\_|_______2_------- _____ _____ 50 pF| | 10K | /| | |________________________4_------- | / | _____ _____ | | _____ 20 pF | | | | | 3|/\ |______| | ^ | |5 || | ___/_ 80 METER VF0 COVERS ABOUT | | || | _____ 100 pF 50 KHz WITH VALUES SHOWN __| |____||_______| / Variable NEEDS BUFFER AMP IF LOAD | ) || | / | IS UNSTABLE __|__ ) ||.01 | | DESIGN BY CHRIS SIEG 11/95 | | | ) |____________| | | | ) | )33uH __|__ )Low R | | | | | | | | | | FIL (+1.5)  The VFO will start with about 15 volts of B+ but I'm running the whole receiver o n +45. Hope you get your xmitter up soon. Maybe we should try a colorburst NET?? 73's -Chris ------------------------------------- Name: Chris Sieg WA3LDI E-mail: c_sieg@mail.conknet.com (Chris Sieg) Date: 11/26/95 Time: 10:42:17 ------------------------------------- ------------------------------ Date: Sun, 26 Nov 1995 10:04:31 -0600 (CST) >From: Bob Roehrig To: EricNess@aol.com Cc: Multiple recipients of list Subject: Re: Tuning up the 3A4 Rcvr Message-ID: On Sat, 25 Nov 1995 EricNess@aol.com wrote: > The turkey day break has given me some time to work on improving the > performance of the "Red Hot" 3A4 receiver. Although I'll never be 100 > percent pleased with the performance, I think I've reached 90 percent. > > So now I guess it's time to start thinking about my next project. Does > anybody have a schematic for a high performance two or three bottle regen > receiver with enough volume to drive a speaker? > Hi Eric & all. I am presently working on a 2 tube regen. I got to thinking about the 1T4 / 3V4 "Boy Scout" reciever I had in the 50's and thought I would try something similar. What I plan to use is a 6AU6 regen followed by a 6C4. It should have enough goo to drive a speaker. Could use a 6AK6 or 6AQ5 for audio (I can always change it, but like to use what I have the most of on hand). I have the chassis & front panel all done and with a little bit of luck, I'll have it done tonight. I'll let ya know how it works. 73 de Bob, K9EUI ------------------------------ End of GLOWBUGS Digest 30 *************************  --simple boundary Content-Type: text/plain; charset=US-ASCII; name="GLO-POR0.031" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename="GLO-POR0.031" GLOWBUGS Digest 31 Topics covered in this issue include: 1) ...'Crystal under Glass'... by lewise@bga.com (KA5T Larry Wise) 2) Freebie crystals. by john 3) Passive grid triodes by kellymed@tmxbris.mhs.oz.au (Murray Kelly) 4) Re: Another Water-Cooled 6L6 Story by Duncan Cadd 5) Re: Tuning up the 3A4 Rcvr by Bob Roehrig ---------------------------------------------------------------------- Date: Mon, 27 Nov 95 01:07:59 EST >From: lewise@bga.com (KA5T Larry Wise) To: glowbugs@theporch.com Subject: ...'Crystal under Glass'... Message-ID: <199511270112.TAA03814@zoom.bga.com> Gang: Bruce, KB0PZD, wrote of the crystal in the tube envelope; Well recently, after reading all the QRP, Boat Anchor, and Glowbugs list entries about building and stuff, I decided to inventory all the crystals that lay in my 'junque' box. After collecting items from at least three different places in the house and garage (distributed junque box???), I found in my hand one of those same little 6al5 glass envelopes as described by Bruce. There was a great glob of some hard glue on the envelope, and not much in the way of markings. I remember extricating this from a TV set way back in antiquity , (probably in the 1960s)... Anyway after cleaning the glue off with an Exacto (or is it X-Acto??) knife and nail polish remover, I had a nice clean envelope with some faint markings on it. Since I couldn't make out the markings I tried the old 'leave it in the freezer for a while trick'. It worked! Here is what I found on the envelope: 828 1107863-1 3579.545 11-61 Sure enough, when tested in the little battery operated CMOS inverters test circuit, there it was on 3579 +something. I agree with Bruce, it sure would look cute setting out on the breadboard with the tubes in a little GlowBug...... Gotta get crackin' on that... KA5T - Larry Wise - Georgetown, Texas - lewise@bga.com KA5T - Larry Wise - Georgetown, Texas - lewise@bga.com ------------------------------ Date: Sun, 26 Nov 95 20:13:50 EST >From: john To: glowbugs@theporch.com Subject: Freebie crystals. Message-ID: <9511270113.AA10240@merlin.nando.net> I just ran across some 7.15908 Mhz crystals... small wire leaded holder (like you'd see in an old CB or 2M rig... HC-??). If you want one or 2 for the price of a SASE, drop me a line. Don't know what they are good for, but the price is right! 73/john wb5oau/4 ------------------------------ Date: Mon, 27 Nov 95 11:26:06 AES >From: kellymed@tmxbris.mhs.oz.au (Murray Kelly) To: glowbugs@theporch.com Subject: Passive grid triodes Message-ID: <648@tmxbris.mhs.oz.au> Thanks to those who commented on the passive grid triode amplifiers. Duncan Cadd got me looking in my books again and sure enough I found it in the RSGB book. Thanks for the offer, too, of a circuit. It's probably pretty standard and I can adapt if I decide to go that way. Cheers. Murray Kelly. vk4aok. ------------------------------ Date: Mon, 27 Nov 1995 13:01:57 +0100 (MET) >From: Duncan Cadd To: glowbugs@theporch.com Cc: dcadd@luc.ac.be Subject: Re: Another Water-Cooled 6L6 Story Message-ID: <9511271201.AA28971@alpha.luc.ac.be> Greetings, Folks, from a dull but dry Diepenbeek in N.E. Belgium! Tony writes: > Isn't it funny that I've heard several stories over the years about 6L6's > having been inverted in water, but no other types. Why do you suppose > that is? > > 73, > Tony > K4KYO Er, uhhhmm, because they don't have a top cap, right ? 8-) Must try it with 833As sometime using a positive ground psu ;-} 73, Duncan ON9CHU / G0UTY G-QRP 8117 ------------------------------ Date: Mon, 27 Nov 1995 15:11:11 -0600 (CST) >From: Bob Roehrig To: EricNess@aol.com Cc: Multiple recipients of list Subject: Re: Tuning up the 3A4 Rcvr Message-ID: On Sat, 25 Nov 1995 EricNess@aol.com wrote: > The turkey day break has given me some time to work on improving the > performance of the "Red Hot" 3A4 receiver. Although I'll never be 100 > percent pleased with the performance, I think I've reached 90 percent. > > Since my last post, I've made a few more changes that make a big difference. > First of all, I 've settled on a tickler of 5 turns. The 7 turns shown in > the article is definitely too much. Secondly, I added a jumper directly from > the frame of the tuning cap to the tuning coil to eliminate loss in the > chassis. Finally, I increased the grid leak resistor to 4.7 Meg (50 pF cap). > At this point, the only think I think I'll play with is the grid leak to > see if I can improve the sound quality a bit on AM signals. > > So now I guess it's time to start thinking about my next project. Does > anybody have a schematic for a high performance two or three bottle regen > receiver with enough volume to drive a speaker? > > 73's, Eric WD6DGX Hi Eric...etc.. Well This weekend I threw together the 2 tube "Autodyne" receiver, using a 6AU6 detector & 6C4 audio amp. I had some "Silver Marshall" plug-in coils so I used those for a test. I used a tuning capacitor with 2 sections (365pf each) and had to parallel both sections to get below 800 kc. I suspect maybe this isn't a BC coil after all since it tunes from 700 kc to 2.6 Mc. Anyway I discovered the same thing as you - way too many turns on the tickler (there were 25 turns). With 7 turns it works much better although I lose regeneration on the low end. I suspect 10 turns would be right. On local stations, I can hear the audio with the cans on the table even though the output transformer I have in there has a 300 ohm output and I am using 2000 ohm phones. I'll probably change to using the output transformer as a choke and cap couple the phones to the plate for a better match. WWV at 2.5 Mc sounded pretty good last nite with my short 30 foot antenna. I use a 5.6 Meg grid resistor and a 75 pf cap. Decreasing the resistor to 1.2 Meg seemed to increase sensitivity a bit (brought it back into regen if it was near the edge to begin with) but that's all so will leave it. The screen grid regen pot gives pretty smooth control and it varies only slightly across the band. I am using an isolation xfmr for the plate supply which gives me about 135V for the audio stage and I use a resistor divider to get 70V for the detector. Next project is to wind some SW coils. I plan to make it both general coverage and ham band band spreaded. 73 de Bob, K9EUI ------------------------------ End of GLOWBUGS Digest 31 *************************  --simple boundary--