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1. [Amps] SELL: Millen HV Connectors (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 21 Dec 2002 09:42:45 -0800; See <http://www.jamesmillenco.com/millen/millmain.htm>; /archives//html/Amps/2002-12/msg00232.html (6,789 bytes)
2. [Amps] LP filter effects (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 16 Nov 2002 09:11:46 -0800; The extra 100 watts of reflected power could be harmonic energy above the filter cutoff. In other words, the filter is doing its job. Or some components have changed value and the filter's characteri; /archives//html/Amps/2002-11/msg00274.html (8,267 bytes)
3. [Amps] LP filter effects (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 16 Nov 2002 09:14:19 -0800; I assumed he had the meter before the LPF. That's the best place for it, since the diodes in the meter may generate harmonic energy themselves. Vic K2VCO; /archives//html/Amps/2002-11/msg00275.html (8,055 bytes)
4. [Amps] LP filter effects (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 17 Nov 2002 09:27:44 -0800; I guess it depends on the design of the meter. The old-style 'monimatch' type with parallel conductors definitely did generate harmonics, and was known to cause TVI, hence the suggestion to put it in; /archives//html/Amps/2002-11/msg00292.html (8,476 bytes)
5. [Amps] Solid state amp advice needed (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 24 Nov 2002 10:51:17 -0800; I have a Henry SS750HF solid state amp. It has four boards, each with a pair of 2sc2879's. The following happened: 1) I applied drive on 28 MHz when the filter was set for 14 MHz (he who is without s; /archives//html/Amps/2002-11/msg00355.html (8,698 bytes)
6. [Amps] Solid state amp advice needed (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Mon, 25 Nov 2002 07:52:14 -0800; In this case, I first swapped out the whole board for a spare (and lost its transistors). Then, I put new transistors in the old board with the same result (it really sounds dumb, doesn't it!). So I; /archives//html/Amps/2002-11/msg00367.html (8,989 bytes)
7. [Amps] Re: Amps digest, Vol 1 #395 - 7 msgs (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 26 Nov 2002 11:40:53 -0800; I checked the balancing resistors in both the splitter and the combiner and they were OK. The resistors on the board look OK (they're hard to check without removing components); but anyway I tried wi; /archives//html/Amps/2002-11/msg00376.html (7,206 bytes)
8. [Amps] Failed 8877 (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 06 Oct 2002 14:29:48 -0700; I don't know about 8877's, but I've had wires in the pins of glass tubes come unsoldered due to heat caused by loose socket contacts. Is this possible here? Vic K2VCO; /archives//html/Amps/2002-10/msg00049.html (7,387 bytes)
9. [Amps] How light can you make a 500W amplifier? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 15 Oct 2002 10:57:49 -0700; I think you mean the SB200/201. There is also the 2x572 Heathkit amp whose model number I don't recall that was intended for mobile use and does not have a built-in PS. These are available cheaply an; /archives//html/Amps/2002-10/msg00145.html (9,185 bytes)
10. [Amps] How light can you make a 500W amplifier? (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 15 Oct 2002 12:44:26 -0700; Right, I saw '230' and for some reason (age, probably), read '220'. It is possibly lighter than the 200. On the other hand, those tubes are hard to find. Vic K2VCO; /archives//html/Amps/2002-10/msg00153.html (8,953 bytes)
11. [Amps] Heising Choke (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 17 Sep 2002 17:06:01 -0700; Why would you want to use a UHF tetrode like the 815 as a modulator? You could use it for a 112 Mc final. A pair of modern 6L6's could easily make enough suds for high-level plate modulation of an HY; /archives//html/Amps/2002-09/msg00121.html (7,744 bytes)
12. [Amps] Henry solid-state amp problem (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 22 Sep 2002 11:08:20 -0700; I have a Henry SS750 solid state amp. It has 8 2sc2879's (four push-pull circuits on individual boards). It operates at 14v. There's a decoupling circuit on the 14v lines going to each board: the col; /archives//html/Amps/2002-09/msg00180.html (7,736 bytes)
13. [Amps] Henry solid-state amp problem (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 22 Sep 2002 15:55:28 -0700; I'm leery of testing with continuous carrier because the amp gets hot quite quickly. I don't operate SSB, if that's what you mean by 'AF' -- just CW. The PS regulates within 0.2 volt and the cables a; /archives//html/Amps/2002-09/msg00187.html (7,599 bytes)
14. [Amps] Henry solid-state amp problem (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 22 Sep 2002 20:09:38 -0700; Well, you nailed it! On all bands except 15 meters, the scope shows a drop of about 0.2v on keying; nothing else. On 15, a BIG (35v p-p) sine wave appears! The power cables are 10' lengths of 00 gaug; /archives//html/Amps/2002-09/msg00193.html (7,918 bytes)
15. [Amps] transformer oil (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 26 Sep 2002 08:27:03 -0700; It's not recommended. I believe that it has a relatively low flash point. Many people have used mineral oil, which is available at drug stores. Vic K2VCO; /archives//html/Amps/2002-09/msg00249.html (6,834 bytes)
16. [Amps] al80a (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Thu, 01 Aug 2002 07:45:34 -0700; I had these symptoms in a friend's AL80B. The problem was a grid-filament short which showed up only when the tube was hot. Try a new tube. Vic K2VCO Fresno CA; /archives//html/Amps/2002-08/msg00006.html (7,795 bytes)
17. [Amps] The Great Equalizer (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Tue, 23 Jul 2002 08:24:16 -0700; Cangreen? 73, Vic K2VCO Fresno CA; /archives//html/Amps/2002-07/msg00435.html (7,025 bytes)
18. [Amps] Solid state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 15 Jun 2002 21:24:11 -0700; I have a Henry Radio SS750 solid-state amp that runs on 14v at about 100 amps max. I'm using a pair of Astron 70-amp power supplies in parallel (they have a sense input that permits this) to power th; /archives//html/Amps/2002-06/msg00104.html (7,804 bytes)
19. [Amps] Solid state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sat, 15 Jun 2002 22:34:21 -0700; That turns out to be the answer. After posting my original message, I noticed that it did NOT happen when I transmitted into a dummy load, only an antenna. The acutating voltage comes from a 78L05 re; /archives//html/Amps/2002-06/msg00107.html (8,089 bytes)
20. [Amps] Solid state relay question (score: 1): Author: rakefet@rakefet.com (Vic Rosenthal); Date: Sun, 16 Jun 2002 09:00:50 -0700; You know, I don't think it's that kind of problem. The antenna I was using is a quad with a balun and I have absolutely no trouble with any other device in the shack -- computer, keyer, TNC, FM radio; /archives//html/Amps/2002-06/msg00113.html (7,929 bytes)

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