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Total 8 documents matching your query.

1. [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)
2. [Amps] Solid state amp advice needed (score: 1): Author: K1LE@ARRL.NET (Jeffrey Madore); Date: Sun, 24 Nov 2002 23:06:01 -0500; Vic, I recently had problems working on a solid state final. The transistors idled fine but the minute I applied drive the collector current went way up and the output was low. I too, let the smoke o; /archives//html/Amps/2002-11/msg00360.html (10,287 bytes)
3. [Amps] Solid state amp advice needed (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Mon, 25 Nov 2002 10:14:37 +0000; Sounds like the sort of thing that might easily cause Vic's problem. Another area to check is any r/l/c feedback round the transistors, and also the supply decoupling. Faults in either could cause de; /archives//html/Amps/2002-11/msg00361.html (8,375 bytes)
4. [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)
5. [Amps] Solid state amp advice needed (score: 1): Author: mark@sandlabs.com (mark); Date: Mon, 25 Nov 2002 13:24:05 -0500; Vic, It has happend to us as well (MRF154) It boiled down that the Power supply lost it's regulation and when it recovered from a step current request it overshoot the MAX Colector Break Down Voltage; /archives//html/Amps/2002-11/msg00370.html (10,197 bytes)
6. [Amps] Solid state amp advice needed (score: 1): Author: K1LE@ARRL.NET (Jeffrey Madore); Date: Mon, 25 Nov 2002 16:20:28 -0500; Vic, You might want to just replace the bad transistors and maybe order a couple of spares. See how the others perform when you test per your plan. And, I think your plan is a good one. Watch the DC; /archives//html/Amps/2002-11/msg00372.html (9,387 bytes)
7. [Amps] Solid state amp advice needed (score: 1): Author: K1LE@ARRL.NET (Jeffrey Madore); Date: Mon, 25 Nov 2002 16:54:46 -0500; Steve, You bring out a couple of good points, so let me pick your brain if you will: In your experience, where does a supply decoupling fault usually show up in a low Z solid state final. Do turn to; /archives//html/Amps/2002-11/msg00373.html (8,867 bytes)
8. [Amps] Solid state amp advice needed (score: 1): Author: g8gsq@qsl.net (Steve Thompson); Date: Tue, 26 Nov 2002 16:17:28 +0000; It's usually capacitor 'failure'. Unless the set is so old that electrolytics might have dried out, the most likely cause in my experience is a broken chip (probably mechanical cause) or dud solder j; /archives//html/Amps/2002-11/msg00374.html (9,337 bytes)

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