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In Reply to: RE: need help to fix mysterious hum problem posted by microbe on March 9, 2014 at 21:37:52:
It can be any cap,anywhere in the circuit.I just said to start with the obvious but you can have problem back in the preamp stage even.
Do this.I haven't seen this amp's schematic but assuming its a 12ax7 or 12au7 driver phase splitter that drives the output tubes,short the input grid to ground on the DPS tubes and then plug the amp back in and see if you hear the hum..This will at least eliminate the possibility of it being in the amp section.
Here is what you do..Just check and see if there is any DC voltage on any the grids of the 12AX7s or 12AU7s..If there is,you have to change those caps.
If you want,email me tomorrow after school..I get home at 530est.
merccougar89@yahoo.com
"For every complex problem there is an answer that is clear, simple, and wrong" H. L. Mencken
Edits: 03/09/14
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- RE: need help to fix mysterious hum problem - Michael Samra 22:42:35 03/09/14 (0)
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