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Question about Ella bias supply - 22K pots

174.29.180.38

Posted on January 11, 2014 at 16:07:40
PeterI
Audiophile

Posts: 1324
Location: Colorado
Joined: October 17, 2006
This a pretty specialized and isolated question. I am looking at the schematic for Ella 3.7. In the bias supply -50VAC is rectified and filtered and sent to 4x 22K pots for output tubes. Does each pot have its own 4.7K resistor to ground?

Bias is supposed to be -36V before the grid resistors. What voltage should be measured at pin 5 (grid) of the EL34 OP tubes?

Thanks for any info.

Peter

 

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