Bottlehead Kits > Crack-a-two-a

Tube Rolling

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TheRedMantra:
Center OA 67.6V
Center OB 71.2V

OB HC 147.0V & 147.9V

Paul Birkeland:

--- Quote from: TheRedMantra on January 10, 2024, 10:12:47 AM ---OB HC 147.0V & 147.9V

--- End quote ---
Those voltages are what I would expect for OA on those boards.

TheRedMantra:
Sorry, I got confused there. Yes, those are the OA measurements. Here are the measurements:

Center OA 67.6V
Center OB 71.2V

OB HC 82.2V & 79.4V

Paul Birkeland:
Yeah so you have about 10V of bias there which isn't so bothersome.  If you had something like 67V coming out of one of the small board outputs and 70V on one of the high current OB terminals, that could have some wonky effects on the operation of the amp.

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