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1. [Amps] Power output drop (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 10 Sep 2013 20:03:43 -0500; ` Anyone have an idea why the power output of my dual parallel 833C 160m amp often drops 200+ watts after several seconds? Re-tuning does not bring it back up to the initial output. Not that a drop f; /archives//html/Amps/2013-09/msg00019.html (7,493 bytes)
2. Re: [Amps] Power output drop (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 10 Sep 2013 18:29:17 -0700; Does the line voltage droop when you transmit, causing a drop in filament voltage? Do you have ceramic capacitors in the tank circuit that heat up and detune the tank? Not that a drop from 1500 to 13; /archives//html/Amps/2013-09/msg00021.html (8,254 bytes)
3. Re: [Amps] Power output drop (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Tue, 10 Sep 2013 20:35:17 -0500; Thanks, Vic. Someone else (in a private e-mail) just suggested line voltage. I do monitor the filament voltage, but I should monitor the 240 VAC and look at the HV meter, too. There is a "too-long" r; /archives//html/Amps/2013-09/msg00022.html (9,110 bytes)
4. Re: [Amps] Power output drop (score: 1): Author: Vic K2VCO <k2vco.vic@gmail.com>; Date: Tue, 10 Sep 2013 18:50:02 -0700; Yes, if it's the caps then retuning would bring it back up. I looked at the pix on your website and I see you have a bunch of 0.01 discs in parallel in series with the input. There is probably some h; /archives//html/Amps/2013-09/msg00025.html (10,267 bytes)
5. Re: [Amps] Power output drop (score: 1): Author: Alek Petkovic <vk6apk@bigpond.com>; Date: Wed, 11 Sep 2013 09:56:23 +0800; It could be the loading padder cap/s. They may be getting warm and going open circuit. If that is the case, then no amount of retuning will bring the power back up. I make this suggestion because in; /archives//html/Amps/2013-09/msg00026.html (10,075 bytes)
6. Re: [Amps] Power output drop (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 11 Sep 2013 10:05:01 -0400; Tank circuit cap drifting should be mitigated by retuning and going open is very uncommon in US made caps. More likely a coupling cap, plate coke or its bypass. A .0047 is sufficient as coupling at 1; /archives//html/Amps/2013-09/msg00033.html (10,144 bytes)
7. Re: [Amps] Power output drop (score: 1): Author: Mike Waters <mikewate@gmail.com>; Date: Wed, 11 Sep 2013 16:14:52 -0500; Hello Carl, Thank you, and you are right about the photos! I'm really sorry about that. I should delete the old photos before I answer anything else. The plate choke (From a Gates 1 kW AM BCB transmi; /archives//html/Amps/2013-09/msg00049.html (9,229 bytes)
8. Re: [Amps] Power output drop (score: 1): Author: "Carl" <km1h@jeremy.mv.com>; Date: Wed, 11 Sep 2013 20:24:02 -0400; OK on the caps, etc Mike. One thing you can try is to get the power drop going good and then power down, chicken stick the HV and feel everything for heat. I dont think you mentioned the condition of; /archives//html/Amps/2013-09/msg00054.html (10,265 bytes)

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