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Post by SteveM on Jul 11, 2020 11:08:34 GMT -5
Beyond the normal hiss when the reverb is turned up, I’m hearing a thumping noise from the back of the cabinet.
any thoughts?
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pdf64
Wholenote
Posts: 556
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Post by pdf64 on Jul 12, 2020 11:42:21 GMT -5
Does having the tremolo turned on or off make any difference?
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Post by SteveM on Jul 13, 2020 14:33:39 GMT -5
I'll check that later today, thanks. I'm also going to take the cage off of the "big" tubes so I can tap on them.
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Post by SteveM on Jul 14, 2020 18:15:17 GMT -5
OK, the noise is only happening when the Vibrato is on and its frequency increase as I increase the Vibrato speed. The V2 tube, which is for the Vibrato, was microphonic. I replaced it, but the noise did not change.
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Post by SteveM on Jul 14, 2020 18:48:38 GMT -5
fenderguru.com/how-fender-amps-work/tubes-explained/After replacing the V5, the noise is much less, ore of a light hiss when the Vibrato channel volume is above 5. Also, prior to this there was a lot of high pitched feedback type noise when the Vibrato channel volume exceeded 7. There is no guitar plugged in. Overall, much better
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