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1. [Amps] microwave transformers (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 11 Mar 2009 21:06:40 -0400; RE: Dittos from all I have learned about MOTs about the only thing they will do correctly is run a microwave oven. They have too few turns in the primary so the transformer runs hot and lossy, the ma; /archives//html/Amps/2009-03/msg00332.html (7,899 bytes)
2. Re: [Amps] Silver-copper (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Thu, 09 Apr 2009 18:33:25 -0400; I had an amp flier that ran hot coils. Painting the metal with muffler spray worked well. No less losses, but helped let the silver plated switches run cooler. We almost went to military production,; /archives//html/Amps/2009-04/msg00111.html (6,438 bytes)
3. [Amps] silver plate (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Fri, 10 Apr 2009 15:16:33 -0400; RE: Does anyone here have any before and after comparisons of silver plating HF tank coils? It seems most of the commercial amateur amp makers do it but I have never seen any specific data. All comme; /archives//html/Amps/2009-04/msg00123.html (7,000 bytes)
4. [Amps] `problems (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Mon, 13 Apr 2009 18:10:31 -0400; Once I solve this problem I will let you all know what stupid mistake I have made with this linear....I have built more than 40 amplifiers over 30 years and this is the first one to give me problems.; /archives//html/Amps/2009-04/msg00149.html (7,898 bytes)
5. [Amps] Fw: High SWR = Baluns actually (score: 1): Author: "herzog@frontiernet.net@frontiernet.net" <herzog@frontiernet.net>; Date: Sat, 25 Apr 2009 17:36:40 -0400; Herzog K2LB says: Harris just got an ethics award. Here are two cases from over 20 years ago to show how they earned it. I tell this because these are common problems that our amps face. One was wher; /archives//html/Amps/2009-04/msg00353.html (7,567 bytes)
6. Re: [Amps] Fw: High SWR = Baluns actually- back to amps!! (score: 1): Author: "herzog@frontiernet.net@frontiernet.net" <herzog@frontiernet.net>; Date: Sun, 26 Apr 2009 00:07:56 -0400; RE: REPLY: FWIW - I had a similar unwanted resonance problem in the unused coils, but mine was caused when the unused coils WERE shorted out. I rewired it so they were no longer shorted out and the p; /archives//html/Amps/2009-04/msg00362.html (8,250 bytes)
7. [Amps] amps (score: 1): Author: "herzog@frontiernet.net@frontiernet.net" <herzog@frontiernet.net>; Date: Sun, 26 Apr 2009 00:14:09 -0400; re Date: Sat, 25 Apr 2009 22:57:25 -0400 From: "Carl" <km1h@jeremy.mv.com> Subject: Re: [Amps] Fw: High SWR = Baluns actually To: <philc@texascellnet.com>, "'Amps reflector'" <amps@contesting.com> Me; /archives//html/Amps/2009-04/msg00363.html (7,977 bytes)
8. [Amps] purpose of 3 ohm resisters between base and emitter? (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Tue, 28 Apr 2009 23:05:12 -0400; All, I have an ENI power amp with what look like SD 1726 transistors in a class C configuration. The circuit is pretty standard, however there are 3 ohm resistors between the base and the emitters. C; /archives//html/Amps/2009-04/msg00394.html (7,556 bytes)
9. Re: [Amps] purpose of 3 ohm resisters between base and emitter? (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 29 Apr 2009 18:32:18 -0400; PS...ENI was a Rochester NY company, and RF Comm and ENI tech talk intermingled as the tech's were friendly. One of my tech's had a wife who worked there. We bought many of their amps to use in testi; /archives//html/Amps/2009-04/msg00396.html (9,931 bytes)
10. [Amps] Silver epoxy yes (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 27 May 2009 20:16:57 -0400; I have == 25 years ago, there was a silver epoxy, that is silver particles in the mix. We had a broken capacitor like that, and a brighit tech tried "epoxy-ing" it. The thing worked. It had poor clad; /archives//html/Amps/2009-05/msg00227.html (6,639 bytes)
11. [Amps] NCL2000 (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Mon, 29 Jun 2009 20:16:07 -0400; RE: Hi, I have some brand new NOS RCA 8122 for sale,I ask $350/ea or tell me what's your best offer. And another guy wanting parts of no description. Herzog, from Different world! Prices, I Had my NC; /archives//html/Amps/2009-06/msg00145.html (6,449 bytes)
12. [Amps] cathode driven/grounded grid magic revealed. (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Tue, 21 Jul 2009 20:34:16 -0400; Quote: The measurement of this improvement, however, would be difficult, because the tuned input would improve the IMD of the transmitter driving the amp (or, to be more specific, the lack of a tuned; /archives//html/Amps/2009-07/msg00253.html (8,488 bytes)
13. [Amps] IMD (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Tue, 21 Jul 2009 20:41:51 -0400; == There should be no patent problems, as the Russians were doing this in the 80's. I read translations, and we found that the trick was in the timing delay for how much could be corrected. It worked; /archives//html/Amps/2009-07/msg00255.html (7,615 bytes)
14. [Amps] Grounded grid 8122's (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Tue, 21 Jul 2009 21:00:00 -0400; I dont believe there is any way to run a 4CX250 style tube in GG without destruction. Very few tetrodes have the necessary grid dissipation required. == When our tube vendor became difficult, we hung; /archives//html/Amps/2009-07/msg00256.html (7,004 bytes)
15. [Amps] Old Transmitter designs (was cathode driven/grounded grid magic revealed.) (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 22 Jul 2009 18:44:53 -0400; EF quote: RIt is well known that a grounded grid amplifier places a varying load on its driver stage. NO ARGUMENT, here is Herzog's details: I have measured 10 ohms low to 35 ohms averaged over an rf; /archives//html/Amps/2009-07/msg00283.html (7,650 bytes)
16. [Amps] inexpensive HV fuse (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 22 Jul 2009 19:28:04 -0400; back in the 50's I had saved my favorite piece of RG8 coax. I saved a foot of it just to use for fuses. Who knew what wires other vendors used. One strand of it's shield would blow about equivalent t; /archives//html/Amps/2009-07/msg00284.html (8,303 bytes)
17. Re: [Amps] Old Transmitter designs (was cathode, driven/groundedgrid magic revealed.) (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Thu, 23 Jul 2009 19:57:10 -0400; I could never disagree with Bill Orr; he was an icon, even in his own time. Whatever he didn't know, he would know who to ask. I went to visit (at my employer's expense) Eimac at least 4 times during; /archives//html/Amps/2009-07/msg00317.html (9,804 bytes)
18. Re: [Amps] inexpensive HV fuse (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Thu, 23 Jul 2009 20:00:39 -0400; hey this should be enjoyed by the list....... _______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps; /archives//html/Amps/2009-07/msg00318.html (11,587 bytes)
19. [Amps] grounding grids (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Mon, 27 Jul 2009 20:35:19 -0400; RE: > >Hi. REPLY: I'm curious - what would be the reason for using resistors and decoupling caps? 73, Bill W6WRT == Herzog proffers a reason, to be able to measure the grid current. _________________; /archives//html/Amps/2009-07/msg00345.html (6,789 bytes)
20. Re: [Amps] grounding grids (score: 1): Author: Herzog <herzog@frontiernet.net>; Date: Wed, 29 Jul 2009 18:07:37 -0400; Yes, that is what I did in a circuit to protect 8122's from drive without any plate voltage. We came up with a circuit fast enough to protect the grid from burning up; which removed the drive. It als; /archives//html/Amps/2009-07/msg00376.html (11,575 bytes)

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