Philco 91 ambiguities

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morzh
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#17

07-01-2026, 08:54 AM

If it were direct heated output tubes, I'd say it is the Cathode bias, but the Cathode are biased by the 4-5 section of the #46 resistor. Not sure why they separated the filaments and the centertap of the rectifier by that resistor. I guess they found out it somehow worked a bit better?

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Messages In This Thread

Philco 91 ambiguities - by Lead Fingers - 06-25-2026, 10:35 PM

RE: Philco 91 ambiguities - by radiorich - 06-26-2026, 02:28 AM

RE: Philco 91 ambiguities - by RodB - 06-26-2026, 11:38 AM

RE: Philco 91 ambiguities - by Lead Fingers - 06-26-2026, 12:44 PM

RE: Philco 91 ambiguities - by klondike98 - 06-26-2026, 01:30 PM

RE: Philco 91 ambiguities - by Lead Fingers - 06-26-2026, 04:56 PM

RE: Philco 91 ambiguities - by Lead Fingers - 06-26-2026, 05:02 PM

RE: Philco 91 ambiguities - by MrFixr55 - 06-27-2026, 12:16 AM

RE: Philco 91 ambiguities - by Lead Fingers - 06-27-2026, 01:26 AM

RE: Philco 91 ambiguities - by RodB - 06-27-2026, 08:41 AM

RE: Philco 91 ambiguities - by Lead Fingers - 06-27-2026, 11:51 AM

RE: Philco 91 ambiguities - by radiorich - 06-27-2026, 12:32 PM

RE: Philco 91 ambiguities - by Lead Fingers - 06-27-2026, 04:34 PM

RE: Philco 91 ambiguities - by klondike98 - 06-28-2026, 09:00 PM

RE: Philco 91 ambiguities - by Lead Fingers - 06-30-2026, 05:05 PM

RE: Philco 91 ambiguities - by Lead Fingers - 06-30-2026, 07:10 PM

RE: Philco 91 ambiguities - by morzh - 07-01-2026, 08:54 AM

RE: Philco 91 ambiguities - by Lead Fingers - 07-01-2026, 09:43 AM

RE: Philco 91 ambiguities - by Lead Fingers - 07-01-2026, 03:08 PM

RE: Philco 91 ambiguities - by MrFixr55 - 07-06-2026, 06:21 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-06-2026, 09:38 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-07-2026, 02:51 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-07-2026, 03:45 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-07-2026, 04:58 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-09-2026, 03:15 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-09-2026, 03:33 PM

RE: Philco 91 ambiguities - by MrFixr55 - 07-09-2026, 08:47 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-09-2026, 09:11 PM

RE: Philco 91 ambiguities - by MrFixr55 - 07-09-2026, 10:11 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-09-2026, 10:26 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-10-2026, 12:06 AM

RE: Philco 91 ambiguities - by radiorich - 07-10-2026, 12:34 AM

RE: Philco 91 ambiguities - by Lead Fingers - 07-10-2026, 11:40 AM

RE: Philco 91 ambiguities - by Lead Fingers - 07-10-2026, 12:27 PM

RE: Philco 91 ambiguities - by Lead Fingers - 07-29-2026, 01:11 AM

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