HH Scott LK72B Amplifier

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HH Scott LK72B Amplifier

Phlogiston
Radio-Fixer-Upper

Posts: 2,118
Threads: 112
Joined: Jun 2010
City: Medford OR (OR what?)

#45

12-14-2019, 11:17 PM

Yes. I suggested checking the 6U8s because you had it on the bench.

Those tubes can self bias through conductive traces on the micas. The more often the tube overheats, the more likely this is to happen. I have seen it in both 7591s and 7868s.

"I just might turn into smoke, but I feel fine"
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Messages In This Thread

HH Scott LK72B Amplifier - by rfeenstra - 03-25-2018, 06:00 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 03-25-2018, 08:59 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 03-25-2018, 10:51 PM

RE: HH Scott LK72B Amplifier - by morzh - 03-25-2018, 11:27 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 03-31-2018, 11:18 PM

RE: HH Scott LK72B Amplifier - by morzh - 04-01-2018, 09:59 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-01-2018, 05:25 PM

RE: HH Scott LK72B Amplifier - by Electrothaumaturgist - 04-01-2018, 06:58 PM

RE: HH Scott LK72B Amplifier - by morzh - 04-01-2018, 09:04 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-05-2018, 08:55 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-05-2018, 10:20 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 04-06-2018, 11:16 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-06-2018, 01:20 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-07-2018, 03:23 PM

RE: HH Scott LK72B Amplifier - by codefox1 - 04-30-2018, 09:44 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 04-30-2018, 10:22 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-01-2018, 12:18 AM

RE: HH Scott LK72B Amplifier - by morzh - 05-01-2018, 11:51 AM

RE: HH Scott LK72B Amplifier - by Phlogiston - 05-01-2018, 12:23 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-01-2018, 04:51 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 05-01-2018, 10:34 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-02-2018, 12:06 AM

RE: HH Scott LK72B Amplifier - by morzh - 05-02-2018, 08:23 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-02-2018, 08:55 AM

RE: HH Scott LK72B Amplifier - by Ron Ramirez - 05-02-2018, 09:45 AM

RE: HH Scott LK72B Amplifier - by morzh - 05-02-2018, 09:47 AM

RE: HH Scott LK72B Amplifier - by Phlogiston - 05-02-2018, 10:38 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-02-2018, 06:10 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-19-2018, 11:32 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 05-20-2018, 11:00 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-20-2018, 12:58 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-20-2018, 01:19 PM

RE: HH Scott LK72B Amplifier - by morzh - 05-20-2018, 02:18 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-20-2018, 02:34 PM

RE: HH Scott LK72B Amplifier - by KCMike - 05-20-2018, 03:01 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 05-20-2018, 03:27 PM

RE: HH Scott LK72B Amplifier - by TV MAN - 05-22-2018, 07:54 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 05-22-2018, 09:08 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 12-14-2019, 01:05 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 12-14-2019, 01:12 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 12-14-2019, 01:58 AM

RE: HH Scott LK72B Amplifier - by Phlogiston - 12-14-2019, 09:20 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 12-14-2019, 09:33 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 12-14-2019, 10:49 PM

RE: HH Scott LK72B Amplifier - by Phlogiston - 12-14-2019, 11:17 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 12-14-2019, 11:47 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-23-2020, 11:32 PM

RE: HH Scott LK72B Amplifier - by PhilcoJohn - 04-26-2020, 05:57 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-26-2020, 11:36 PM

RE: HH Scott LK72B Amplifier - by morzh - 04-26-2020, 11:48 PM

RE: HH Scott LK72B Amplifier - by rfeenstra - 04-27-2020, 01:37 AM

RE: HH Scott LK72B Amplifier - by MrFixr55 - 08-14-2022, 08:04 AM

RE: HH Scott LK72B Amplifier - by RGK20m3 - 08-15-2022, 07:17 AM

RE: HH Scott LK72B Amplifier - by rfeenstra - 08-15-2022, 10:13 AM

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