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1. [Amps] amp conversion filament quandry (score: 1): Author: gdaught6 at stanford.edu (gdaught6@stanford.edu); Date: Wed Jun 4 09:18:43 2003; Hi, I am converting an old Alpha-70V to use a 3CX1200Z7 instead of the teapot type 3CX1500V. The original filament transformer provides 5 volts at 30 amps. The 1200Z7 wants 6.3 volts at 25 amps. I'm; /archives//html/Amps/2003-06/msg00021.html (7,268 bytes)
2. [Amps] 4pr1000 heater voltage? (score: 1): Author: gdaught6 at Stanford.edu (gdaught6@Stanford.edu); Date: Wed May 7 08:21:35 2003; BAD GUESS!! It's more like 21 amperes! Yes. 73, George T. Daughters, K6GT; /archives//html/Amps/2003-05/msg00051.html (7,067 bytes)
3. [Amps] Arcing (score: 1): Author: gdaught6 at stanford.edu (gdaught6@stanford.edu); Date: Fri Mar 7 14:25:09 2003; It's really simple! Somebody already posted V=Ldi/dt and for those of us uncomfortable with calculus, in words it's "The voltage across an inductor is a product of the inductance and the rate of chan; /archives//html/Amps/2003-03/msg00311.html (8,260 bytes)
4. [Amps] 10 Meter RF envelope increaser (score: 1): Author: gdaught6 at stanford.edu (gdaught6@stanford.edu); Date: Thu Feb 6 19:51:53 2003; I'd add that that's pronounced "leaner" (or leeeener) by the CB'ers I've met. 73,; /archives//html/Amps/2003-02/msg00121.html (7,556 bytes)
5. [Amps] Filament transformer needed (score: 1): Author: gdaught6@Stanford.edu (gdaught6@Stanford.edu); Date: Sun, 13 Oct 2002 19:28:02 -0700; Not a good idea in general! Fewer volts is fine, but putting 220 on a 110 primary to double the output volts is asking for trouble... in the form of high temperatures, high primary currents, and blow; /archives//html/Amps/2002-10/msg00127.html (7,204 bytes)
6. [Amps] Question To the guru's (score: 1): Author: gdaught6@Stanford.edu (gdaught6@Stanford.edu); Date: Mon, 23 Sep 2002 16:19:59 -0700; I once read that an apostrophe is a punctuation mark which is a signal that the letter "s" is about to occur. 8>) 73,; /archives//html/Amps/2002-09/msg00219.html (7,282 bytes)
7. Re: [Amps] 3cx8ooA7 (score: 1): Author: gdaught6@stanford.edu; Date: Sat, 30 Aug 2003 11:58:18 -0700; I don't think an Alpha 76 uses 3cx800a7's, does it? In the PA-76 manual right in front of me, it's 8874's. And I think Svetlana makes a 3cx400a which is an equivalent, but since the change, I don't k; /archives//html/Amps/2003-08/msg00083.html (7,211 bytes)
8. Re: [Amps] Ameritron AL-572B (score: 1): Author: gdaught6@Stanford.edu; Date: Wed, 22 Oct 2003 08:44:37 -0700; < snip > Don't forget the 4x150a! A fellow at Eimac told me years ago that you could run them in the '250 applications, SO LONG AS YOU KEEP THEM COOL. Probably fine in G-G service, if you use the pro; /archives//html/Amps/2003-10/msg00210.html (7,947 bytes)
9. [Amps] ic-2kl question (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 29 Oct 2003 21:36:06 -0800; I have lent my icom ic2kl amplifier and power supply to a friend for sweepstakes. He says it doesn't have 10 meter capability, but I remember installing the factory-supplied mod kit for 10 meters. In; /archives//html/Amps/2003-10/msg00289.html (6,652 bytes)
10. Re: [Amps] AL-80B reversing its grid current (score: 1): Author: gdaught6@stanford.edu; Date: Sat, 08 Nov 2003 10:42:47 -0800; It sounds like a filament-to-ground short. I had an LK550 that did the same thing. It turned out that the tubes were all OK. There was an intermittent short between a filament choke lead and the chas; /archives//html/Amps/2003-11/msg00107.html (8,389 bytes)
11. Re: [Amps] 4CX1600B - Bangs (score: 1): Author: gdaught6@stanford.edu; Date: Sat, 15 Nov 2003 09:30:45 -0800; I agree. OK. I've had a "bang" event in my HB '1600b amp, one time. Afterwards, the tube was fine. The only damaged component was the shunt resistor for the screen grid current meter, which exploded.; /archives//html/Amps/2003-11/msg00195.html (9,218 bytes)
12. [Amps] w4th ? (score: 1): Author: gdaught6@Stanford.edu; Date: Tue, 16 Dec 2003 14:45:17 -0800; Hi, I'm looking for a valid e-mail address for W4TH (Tom's Tubes)... are you out there, Tom? 73, George T. Daughters, K6GT _______________________________________________ Amps mailing list Amps@conte; /archives//html/Amps/2003-12/msg00271.html (6,245 bytes)
13. Re: [Amps] Re: matching network (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 28 Jan 2004 09:26:11 -0800; < snip > I'm pretty sure Ian means that both grids need to be bypassed to ground, if you're going to drive the cathode. But I think Rich and Ian (and I) agree that doing a "grounded-grid" amplifier u; /archives//html/Amps/2004-01/msg00325.html (8,258 bytes)
14. Re: [Amps] Coleman lantern chimneys for 3CX1200A7/Z7 and 3-500Z (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 02 Feb 2004 08:39:29 -0800; McMaster Carr: 12"x12" at very reasonable prices. Remember that the 3-500 is a glass bottle, where we want lots of air flow external to the tube envelope. The 3cx1200 tubes have the dense accordion p; /archives//html/Amps/2004-02/msg00014.html (8,887 bytes)
15. Re: [Amps] tube cooling (score: 1): Author: gdaught6@stanford.edu; Date: Sat, 14 Feb 2004 10:40:15 -0800; Old, yes. Wise & sage, not necessarily (I speak of myself.) What's important is the temperature of the seals. The trouble with anode-tofilament pin air flow is that the anode cooling air "preheats" t; /archives//html/Amps/2004-02/msg00109.html (7,677 bytes)
16. Re: [Amps] IC 756 Pro-2 Help wanted (score: 1): Author: gdaught6@stanford.edu; Date: Fri, 20 Feb 2004 09:39:02 -0800; Or was it Carol? You don't need the 7-pin din connector for a homebrew. I key mine by just using the "send" jack (RCA jack at the lower right when you face the back panel of the Pro-II) to key the T/; /archives//html/Amps/2004-02/msg00191.html (7,443 bytes)
17. Re: [Amps] sb-220 tuning question - closing in (score: 1): Author: gdaught6@stanford.edu; Date: Fri, 05 Mar 2004 08:31:40 -0800; Hi, I use colored masking tape, utilizing the component color code: 10 meters : ignore the zero = 1 ==> brown 15 meters : ignore the one = 5 ==> green 20 meters : ignore the zero = 2 ==> red 40 meter; /archives//html/Amps/2004-03/msg00059.html (8,647 bytes)
18. Re: [Amps] AMP INT LK500ZC (score: 1): Author: gdaught6@stanford.edu; Date: Fri, 05 Mar 2004 08:48:22 -0800; First guess: Grid to Filament short in a tube. Since you've tried substituting "known good" tubes, we get to... Second guess: filament to ground short ... a shorted zener shouldn't result in a high p; /archives//html/Amps/2004-03/msg00060.html (8,163 bytes)
19. Re: [Amps] Re: GU-84b: Drive power required for full power output ? (score: 1): Author: gdaught6@stanford.edu; Date: Mon, 29 Mar 2004 18:57:59 -0800; I'd like to add that the variability in this factor is about +/- 20% for the Russian tubes I've used. I designed an amplifier based on the published figures, with Eg1= -56 volts. I found that differe; /archives//html/Amps/2004-03/msg00344.html (9,448 bytes)
20. Re: [Amps] High Voltage inverter? (score: 1): Author: gdaught6@stanford.edu; Date: Wed, 07 Jul 2004 22:41:53 -0700; We bought one. The "inverter" part of it is apparently a switching HV supply. It produces ghastly RFI! Our house rule is "Don't use it when Grumps is on the radio!" If someone in the neighborhood get; /archives//html/Amps/2004-07/msg00037.html (7,794 bytes)

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