From owner-glowbugs@@shakti Tue May 6 02:23:32 1997 Received: by csres2.cropsci.ncsu.edu (5.61-AIX-1.2/1.0) from [155.229.53.48] with SMTP id AA108261 (for rdkeys, from owner-glowbugs@@shakti/owner-glowbugs@@shakti); Tue, 6 May 97 02:23:32 GMT Received: by shakti. (SMI-8.6/SMI-SVR4) id WAA00758; Mon, 5 May 1997 22:25:35 -0400 Date: Mon, 5 May 1997 22:25:35 -0400 Message-Id: <199705060225.WAA00758@shakti.> From: owner-glowbugs@@shakti (glowbugs) To: glowbugs-digest@www.atl.org Subject: glowbugs V1 #24 Sender: owner-glowbugs@@shakti Errors-To: owner-glowbugs@@shakti Precedence: bulk Status: O glowbugs Monday, May 5 1997 Volume 01 : Number 024 ---------------------------------------------------------------------- Date: Mon, 5 May 1997 01:59:48 +0000 >From: Sandy W5TVW Subject: FS/FT: Bendix connectors A lot of Bendix Military Bayonet connectors (all cable types with cable clamps) NOS in with gold-plated inserts (male or female pins) in seperate containers. each set sealed in poly bags. I have about 50 of each of the numbers below. If someone is interested in the whole lot, I'll include the special pin inserter and the pin crimping tool. These connectors cost around $6-10 back in the late 1970's! (each) Each is packed with a "Silver Saver" to prevent corrosion. Types I have: PTO1CE-18-32P (SR) 32-pin male PT06CE-18-32S (SR) 32-pin female PT01CE-14-19P (SR) 19-pin male PT06CE-14-19S (SR) 19-pin female Anyone interested in just a few, I'll sell them for $5 a set (male and mating female) If anyone is interested in the entire lot, I'll sell them for $200 and throw in the tooling. All prices exclusive of shipping costs. The tooling today is easily worth this. These are very nice connectors for someone needing some compact, very high quality, MIL-spec multiwire connectors. I am also open to trades for boat anchor Radio gear, test gear. Sandy W5TVW E. V. Sandy Blaize, W5TVW "Boat Anchors collected, restored, repaired, traded and used!" 417 Ridgewood Drive, Metairie, LA., 70001 ebjr@worldnet.att.net **Looking for: 860 tubes, WL-460 tubes** **Butternut HF2V antenna, G-R test gear.....................*** ------------------------------ Date: Mon, 5 May 1997 07:26:57 -0400 >From: BEN NOCK <106312.1035@compuserve.com> Subject: GRC109 and 123 set Somebody said this : >The British SAS had a version called the Mk-123 set that was housed in a >wooden case, had a built in straight key, put out about 10 watts and had >a tuneable RX from 2-18 mc (if I remember correctly). I bought one in the >UK about 15 years ago and very stupidly sold it. Well, in fact the 123 is supplied in a canvas case, runs about 20-30 watt depending on freq, and has questionable SAS connection. If anyone wants to read about it, see my article on the 123 in Radio Bygones, copies available from them. Ben G4BXD. ------------------------------ Date: Mon, 5 May 1997 10:27:10 -0700 (MST) >From: Jeff Duntemann Subject: A $3.99 power transformer Hi gang-- I ordered a power transformer (two of them, actually) from Burden's Surplus Center, which is NOT a hotbed of RF parts procurement. (Mostly, they sell hydraulic cylinders.) However, they offered this NOS military surplus transformer for $3.99 so I bought a couple. It was billed as 6.3V @ 3A and 315V @ 20ma. The transformer comes embedded in foam inside a cardboard box dated 1973. It's completely sealed in the usual military style, with 4 6-32 mounting bolts and solder lugs on the bottom. The inscription indicates that it's rated 20ma continuous at 315VDC, but it can supply 50ma at a duty cycle of 5 min/hour. I was hoping it was 315V CT, (which would make it ideal for small receiver projects) but when I tested it I found that the HV secondary is 600VCT. The center tap is internally grounded to the case--as is the center tap on the filament winding. 315VDC is about what you'd get out of it with a half-wave silicon diode rectifier, as my line voltage is 124V (!!!) and that 600VCT figure is probably a little high. I was thinking it would make a good supply for the 6T9er, but the 6T9 has a design maximum plate voltage of 275V. So what we need is a triode/pentode that can take 315-320V on the plates safely and put out about 6 watts or a little less. (The transformer can probably provide no more than 14-15W input.) Any suggestions? In any event, this is a mil-spec unused transformer for $4. A QRP gem. Here's the pointer: Burden's Suplus Center 1015 W. "O" Street PO Box 82209 Lincoln NE 68501-2209 1-800-488-3407 The transformer is Item # 15-1057. Their catalog is worth having, as it lists a lot of motors and isolation transformers. - --73-- - --Jeff Duntemann KG7JF Scottsdale, Arizona ------------------------------ Date: Mon, 05 May 1997 14:35:47 -0400 >From: John Levreault Subject: Re: A $3.99 power transformer At 10:27 AM 5/5/97 -0700, Jeff Duntemann wrote: > >I ordered a power transformer (etc, etc, etc) >I was hoping it was 315V CT, (which would make it ideal for small receiver >projects) but when I tested it I found that the HV secondary is 600VCT. >The center tap is internally grounded to the case--as is the center tap on >the filament winding. > >315VDC is about what you'd get out of it with a half-wave silicon diode >rectifier, as my line voltage is 124V (!!!) and that 600VCT figure is >probably a little high. I was thinking it would make a good supply for the >6T9er, but the 6T9 has a design maximum plate voltage of 275V. So what we >need is a triode/pentode that can take 315-320V on the plates safely and >put out about 6 watts or a little less. (The transformer can probably >provide no more than 14-15W input.) > >Any suggestions? > > Yes. You could use an LC filter after your rectifier. You will need something like 80 or 100H, though. However, a better idea would be to simply drop the extra voltage with a resistor. We're not talking much power here. To drop 40V at 20ma only requires 2Kohms at 0.8W. Use a 2 or 3W resistor to be on the safe side. Panasonic sells some nice (flameproof, take it from one who knows) metal oxides in 2 and 3W sizes for cheap. Use a full wave rectifier, too, since you've already got the secondary center tap grounded. If you're interested in the hollow variety, a 6X4 should do the trick. 73 de NB1I John Levreault ------------------------------ Date: Mon, 5 May 97 14:55:21 EDT >From: jkh@lexis-nexis.com (John Heck) Subject: Re: A $3.99 power transformer For anybody who needs a power transformer for 2.5 volt filament tubes I have the following: Stancor P-6003 Power Transformer New in Box 350-0-350 70 ma 2.5v C.T. 3 amp <============ NOTE 5v C.T. 9 amp This is a Horizontal Half Shell transformer with box and instruction sheet $20 plus postage FMA #9342 Power Transformer New In Box 325-0-325 50 ma 2.5v C.T. 1.75 amp <============ NOTE 5v C.T. 3 amp This is a horizontal Half Shell transformer in original cardbord wrapper with enough(silverfish got 'em) of the instruction sheet to read specs. $10 plus postage. Regards, John Heck, KC8ETS 1009 Donson Drive Dayton, Ohio 45429 (513)865-7036(work) jkh@lexis-nexis.com > At 10:27 AM 5/5/97 -0700, Jeff Duntemann wrote: > > > >I ordered a power transformer (etc, etc, etc) > >I was hoping it was 315V CT, (which would make it ideal for small receiver > >projects) but when I tested it I found that the HV secondary is 600VCT. > >The center tap is internally grounded to the case--as is the center tap on > >the filament winding. > > > >315VDC is about what you'd get out of it with a half-wave silicon diode > >rectifier, as my line voltage is 124V (!!!) and that 600VCT figure is > >probably a little high. I was thinking it would make a good supply for the > >6T9er, but the 6T9 has a design maximum plate voltage of 275V. So what we > >need is a triode/pentode that can take 315-320V on the plates safely and > >put out about 6 watts or a little less. (The transformer can probably > >provide no more than 14-15W input.) > > > >Any suggestions? > > > > ------------------------------ Date: Mon, 5 May 1997 14:16:31 -0500 (CDT) >From: Dave Subject: RE: 3.99 Power Transformer >In any event, this is a mil-spec unused transformer for $4. A QRP gem. >Here's the pointer: >Burden's Suplus Center >1015 W. "O" Street >PO Box 82209 >Lincoln NE 68501-2209 >1-800-488-3407 >The transformer is Item # 15-1057. Hey Jeff et al, Just called 'em up and ordered my 2 such power transformers! The guy who took the order, when told I had heard of them through a mailing list on the internet, said 'wow! another one!', so they must be getting flooded with calls for this choice little find! Sure seems like a useable unit, even if only for the filamant winding! Order fast before they're all gone Dave WB7AWK * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * And on the Seventh Day, God rested. Day Eight, thing One, He made 35EH5's, and He said: "Gee, these things are worthless. Yuk" * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * ------------------------------ Date: Mon, 5 May 1997 14:46:08 -0500 (CDT) >From: mjsilva@ix.netcom.com (michael silva) Subject: Re: A $3.99 power transformer Jeff wrote: >... I was thinking it would make a good supply for the >6T9er, but the 6T9 has a design maximum plate voltage of 275V. So >what we need is a triode/pentode that can take 315-320V on the plates >safely and put out about 6 watts or a little less. (The transformer >can probably provide no more than 14-15W input.) > >Any suggestions? Hey Jeff, our forebearers would have happily put 400 or more volts on it (once they stopped laughing at how it looks!). You can lower the output voltage by using a tube rectifier and/or a choke input filter. Of course, the rectifier is just being resistive, while the choke input will boost the current output in addition to dropping the voltage. Another approach to lowering the plate-cathode voltage is to divide the grid bias up between grid leak and cathode bias rather than relying solely on grid bias. In the '48 Handbook there's a two-tuber that does this. (This is the one I'm sending you, Matt) 73, Mike, KK6GM ------------------------------ Date: Mon, 5 May 1997 13:24:31 -0700 (MST) >From: Jeff Duntemann Subject: Re: A $3.99 power transformer At 02:46 PM 5/5/97 -0500, Jeff KG7JF wrote: > >>... I was thinking it would make a good supply for the >>6T9er, but the 6T9 has a design maximum plate voltage of 275V. So >>what we need is a triode/pentode that can take 315-320V on the plates >>safely and put out about 6 watts or a little less. (The transformer >>can probably provide no more than 14-15W input.) >> >>Any suggestions? > >Hey Jeff, our forebearers would have happily put 400 or more volts on >it (once they stopped laughing at how it looks!). You can lower the >output voltage by using a tube rectifier and/or a choke input filter. >Of course, the rectifier is just being resistive, while the choke input >will boost the current output in addition to dropping the voltage. >Another approach to lowering the plate-cathode voltage is to divide the >grid bias up between grid leak and cathode bias rather than relying >solely on grid bias. In the '48 Handbook there's a two-tuber that does >this. (This is the one I'm sending you, Matt) As usual, the group provides more than I asked for. What I meant was, Any suggestions on a tube that will do what a 6T9 will do but tolerate higher voltage. But I hadn't even thought about the effect of a choke-input filter. That will certainly work, as would putting in resistors or a tube rectifier. But since power is dissipated in any such scheme I wanted to avoid doing that, since the transformer sources too little to begin with, and I'd just as soon give all it can give to the oscillator/final to turn into radio waves. (Yes, I know half goes to heat anyway...) Thanks to all for the suggestions. Would still like to know of a 6T9-like tube that can take 350 volts or so. - --73-- - --Jeff Duntemann KG7JF Scottsdale, Arizona ------------------------------ Date: Mon, 5 May 1997 20:39:15 +0000 >From: Sandy W5TVW Subject: Info Needed: Solar CF Looking for a copy of an instruction manual for the Solar Electric Model CF "Exam-eter" capacitor analyzer. Something like a Sprague Tel-Ohmike. Anybody have any poop out there? 73, E. V. Sandy Blaize, W5TVW "Boat Anchors collected, restored, repaired, traded and used!" 417 Ridgewood Drive, Metairie, LA., 70001 ebjr@worldnet.att.net **Looking for: 860 tubes, WL-460 tubes** **Butternut HF2V antenna, G-R test gear.....................*** ------------------------------ Date: Mon, 5 May 1997 18:43:19 -0400 (EDT) >From: leeboo@ct.net (Leon Wiltsey) Subject: WTB Heath manuals Hi Gand in the past have seen posted addresses for suppliers of manuals for Heath kits. can anybidy supply me with this info? tnx 73 Thank the good LORD for all that you have!!! Leon B Wiltsey jr. (Lee) 4600 Lake Haven blvd... Sebring fl 33872............. 68yr old retired semi disabled senior (stroke got my balance and hand to eye coordination) formerly w4kcj & kp4ryb ( till I quite) dumb dumb NOW KF4RCL MUCH HAPPINESS play keyboard and sing music 1920's to 60' none of the 80'S- 90'S noise ------------------------------ Date: Mon, 5 May 1997 16:13:34 utc >From: wb0aaq@juno.com (FREDERICK I VAN ARTSDALEN) Subject: Re: AN/GRC109 Hi Gang, I'm curious and have an idea...........How many of us have an AN/GRC109 setup? Let me know....just say "I have one"...and I'll post my idea to the list in a couple days. You can say more....I don't care........just wanting to keep it simple for ya. 73 es real radios DO glow in the dark! Ike WB0AAQ wb0aaq@juno.com ------------------------------ Date: Mon, 5 May 1997 19:39:35 -0500 (CDT) >From: "Carol N. Wright" Subject: Re: WTB Heath manuals Hey Leon. Try http://www.w7fg.com Best 72/73 DE Matt, AE4JM ------------------------------ Date: Tue, 6 May 1997 01:29:17 +0000 >From: Sandy W5TVW Subject: BA NET: 40 mtrs Standing by on 7050 to try a portable setup out. Where did all the BA/GB bunch go? It's been very noisy here until the last coupla days! 73, E. V. Sandy Blaize, W5TVW "Boat Anchors collected, restored, repaired, traded and used!" 417 Ridgewood Drive, Metairie, LA., 70001 ebjr@worldnet.att.net **Looking for: 860 tubes, WL-460 tubes** **Butternut HF2V antenna, G-R test gear.....................*** ------------------------------ Date: Mon, 05 May 1997 21:53:24 -0800 >From: "catherine a dumar westelcom.com" Subject: Re: AN/GRC109 :CC: wb0aaq@juno.com :Hi Gang, :I'm curious and have an idea...........How many of us have an :AN/GRC109 :setup? Let me know....just say "I have one"...and I'll post my :idea to the :list in a couple days. :You can say more....I don't care........just wanting to keep it :simple for ya. :73 es real radios DO glow in the :dark! :Ike WB0AAQ :wb0aaq@juno.com I have one Charlie, KA2VCS (cjdumar@westelcom.com) Two can live as cheaply as one, for half as long. Net-Tamer V 1.09 Beta - Registered ------------------------------ Date: Mon, 5 May 1997 21:25:38 -0500 (CDT) >From: mjsilva@ix.netcom.com (michael silva) Subject: Transformer Ratings (was Re: A $3.99 power transformer) Prompted by the comments regarding expected output from a transformer I thought I'd pass along a nice summary, found in the current Hammond catalog: Half Wave, Cap. input filter Vpeak = 1.41 * Vsec Vavg = 0.9 * Vsec I D.C. = 0.28 * Isec Full Wave, Cap. input filter Vpeak = 0.71 * Vsec Vavg = 0.45 * Vsec I D.C. = 1.0 * Isec Full Wave, Choke input filter Vpeak = 0.45 * Vsec Vavg = 0.45 * Vsec I D.C. = 1.54 * Isec Bridge, Cap. input filter Vpeak = 1.41 * Vsec Vavg = 0.9 * Vsec I D.C. = 0.62 * Isec Bridge, Choke input filter Vpeak = 0.9 * Vsec Vavg = 0.9 * Vsec I D.C. = 0.94 * Isec where Vsec and Isec are the AC RMS ratings of the transformer secondary. The average values naturally depend somewhat on the filter constants, etc. While the voltage numbers are commonly found in handbooks I had not seen the current ratings listed before. With diodes less than 10c each it makes you never want to build another half-wave rectifier, doesn't it? 73, Mike, KK6GM ------------------------------ End of glowbugs V1 #24 **********************