Question about Ella bias supply - 22K pots
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| Posted on January 11, 2014 at 16:07:40 | |
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Posts: 1432
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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