Above Chassis Bias - Part Deux (Question for PJ)

Paully · 2599

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Offline Paully

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on: September 17, 2011, 04:47:02 AM
Paul, you helped me when I was putting in some bias pots above the chassis for 45 tubes.  If memory serves we used some diodes and a 1.1K and a 3.3K resistor per board.  If I want to play around with some 300B tubes and convert my Paramount back do I need to change the values of those resistors?


Offline Paul Joppa

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Reply #1 on: September 18, 2011, 07:00:26 AM
Those resistors and that circuit are not useful for the 300B; they are specific to the direct coupled setups. It's in the manual - different driver plate voltage settings for 2A3 and 300B.

Paul Joppa

Offline Paully

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Reply #2 on: September 18, 2011, 08:38:35 AM
All right, thanks for the response!  I will look in the manual.


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