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361. Re: [Amps] TL922 failure - SOLVED (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Fri, 13 May 2022 11:18:49 +0300
As usual, it turned out to be my fault. I put a small ww resistor in series with the filament transformer primary to reduce the filament voltage to exactly 5.0v. The resistor has been there for years
/archives//html/Amps/2022-05/msg00004.html (8,235 bytes)

362. [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 4 Jun 2022 12:35:45 +0300
This isn't a problem, just a phenomenon that I would like to understand. I have a TL922. Mods include directly grounded grids. I also measured the filament voltage with my Fluke true RMS meter and pu
/archives//html/Amps/2022-06/msg00000.html (7,038 bytes)

363. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 4 Jun 2022 16:43:23 +0300
The power increases after I transmit for a while. Then if I leave the amp on standby, it goes back to what it was before. But this resistor has the same current through it whenever the amp is on. If
/archives//html/Amps/2022-06/msg00007.html (12,356 bytes)

364. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 4 Jun 2022 16:51:26 +0300
1. I have often wondered whether the filament voltage should be measured under full power or in standby. I operate CW only, so even during a transmission, 50% of the time the voltage is at the key up
/archives//html/Amps/2022-06/msg00008.html (11,187 bytes)

365. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 4 Jun 2022 16:57:50 +0300
I will check the resting plate current. My bias circuit has been modified to cut off the tubes in key up. There is a zener, and there are some other components that might be changing value, so that's
/archives//html/Amps/2022-06/msg00009.html (11,424 bytes)

366. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sat, 4 Jun 2022 17:06:19 +0300
The input network is a possibility. Wattmeters are a possibility, though I've noticed this with two different ones. No lowpass filter. There are no traps or inductors/capacitors in the transmission l
/archives//html/Amps/2022-06/msg00010.html (10,096 bytes)

367. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 13:55:56 +0300
This morning, for some reason, the phenomenon did not occur. I was getting close to 1400 watts the whole time. I always operate CW in the SSB position -- the warning in the manual against this is (I
/archives//html/Amps/2022-06/msg00023.html (11,755 bytes)

368. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 14:04:32 +0300
I did measure the voltage at the tube pins. I haven't measured it while transmitting, because the RF drives my meter crazy. I assume the voltage drops a bit. Unfortunately I no longer have my trusty
/archives//html/Amps/2022-06/msg00025.html (11,984 bytes)

369. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 14:35:20 +0300
Yes, I found it here: <https://www.w8ji.com/filament_voltage_life.htm> He notes that the Eimac specs for the 3-500Z call for 4.75-5.25v. What I should do is check my line voltage (it is usually prett
/archives//html/Amps/2022-06/msg00027.html (15,416 bytes)

370. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 15:39:11 +0300
The line voltage was 235, about what it usually is. The amp is wired for 240v (my model also has a 220v tap). When I removed the resistor that I had added, the filament voltage was 5.1 volts in stand
/archives//html/Amps/2022-06/msg00030.html (14,973 bytes)

371. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 17:49:33 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2022-06/msg00036.html (8,574 bytes)

372. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 17:54:29 +0300
Thanks, Paul. I'm going to look into possible line voltage drops. I can think of some areas of concern that I can improve. Thanks for the signal report! I'm running about 1300-1400w into a dipole at
/archives//html/Amps/2022-06/msg00037.html (10,902 bytes)

373. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 17:56:16 +0300
I read his article. He uses an RF filter. I might try that. My meter is a "good" one, a Fluke. But of course I've never sent it out for calibration. 73, Victor, 4X6GP Rehovot, Israel CWops #5 Formerl
/archives//html/Amps/2022-06/msg00038.html (14,031 bytes)

374. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 19:18:35 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2022-06/msg00040.html (8,355 bytes)

375. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Sun, 5 Jun 2022 19:19:25 +0300
Good idea. 73, Victor, 4X6GP Rehovot, Israel CWops #5 Formerly K2VCO https://www.qsl.net/k2vco/ On 05/06/2022 18:41, Steve wrote: Tack a 10k resistor to each filament pin, 10nF decoupling between the
/archives//html/Amps/2022-06/msg00041.html (9,924 bytes)

376. Re: [Amps] Why does power output increase? (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 6 Jun 2022 21:09:04 +0300
Not very hot. I have a bias control circuit that cuts the tubes off completely when the key is up. <snip> the TL-922 will run quite a bit slower, with much less RPM..and cooling. When I got the TL92
/archives//html/Amps/2022-06/msg00062.html (10,373 bytes)

377. Re: [Amps] Blowing out finals on a Icom 7300 using a Ameritron AL 80B. Help Please! (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 6 Jun 2022 22:34:35 +0300
Here is a theory: the 3-500z in the AL80b suffered a flashover from the plate to the grid. I don't know the details of the AL80b circuit, but possibly the current surge resulted in a high voltage app
/archives//html/Amps/2022-06/msg00064.html (11,466 bytes)

378. [Amps] W4ETO SK (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Tue, 28 Jun 2022 16:04:43 +0300
_______________________________________________ Amps mailing list Amps@contesting.com http://lists.contesting.com/mailman/listinfo/amps
/archives//html/Amps/2022-06/msg00117.html (6,550 bytes)

379. [Amps] W4ETO SK (score: 1)
Author: Victor Rosenthal <k2vco.vic@gmail.com>
Date: Tue, 28 Jun 2022 16:06:08 +0300
From the Daily DX: W4EA, aka W4ETO, (ex WA4NGO, K6CTV, W0FID, W9AOA), Richard W. Ehrhorn, is now a Silent Key. Dick stated ETO and Alpha HA amplifiers in 1970. You can see Dick's bio at <https://www.
/archives//html/Amps/2022-06/msg00118.html (6,606 bytes)

380. Re: [Amps] Harris RF-110A AM-3924 (score: 1)
Author: Victor Rosenthal 4X6GP <k2vco.vic@gmail.com>
Date: Mon, 19 Sep 2022 18:33:58 +0300
<snip> Step 2. With filiment, apply 500v grid to the 4cx1500's but no plate, and 500 v plate to the 8122's let that soak for a while, <snip> NEVER DO THIS! If you apply screen voltage without plate v
/archives//html/Amps/2022-09/msg00034.html (7,562 bytes)

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