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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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Tubes Asylum Questions about tubes and gear that glows. FAQ |
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In Reply to: insufficient range on bias pot scott 299b posted by thermionic emitter on July 12, 2016 at 22:39:37:
because I'm seeing more blue at the top then normal..What you most likely need to do is take out the old selenium bridge rectifier and put in a silicon bridge to get the negative bias voltage higher.If it was changed,look at the 75v filter caps on that one can.
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 07/13/16
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Follow Ups
- The 6p14p tubes look like they are running hot in photo - Michael Samra 09:54:27 07/13/16 (2)
- His bias seems too cold, not hot - FenderLover 17:56:37 07/13/16 (1)
- RE: His bias seems too cold, not hot - Michael Samra 19:42:09 07/13/16 (0)
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