There's significant hum (and static momentarily when i flip on the standby switch) in this amp with all front panel controls zeroed.
Plugging a guitar cable into the power amp in jack eliminates the hum...sounds normal.
pulling V1, V2, V3, V4 or V5....no change in hum.
pulling V6, V7, or V8....hum is gone
hum is heard in a second amp fed from preamp out jack
no hum is heard in a second amp fed from effects send jack.
i'm not sure what to check next....i've metered all the resistors associated with V6-V8 and they are fine. not sure about the caps. any ideas? thanks for your help!
Plugging a guitar cable into the power amp in jack eliminates the hum...sounds normal.
pulling V1, V2, V3, V4 or V5....no change in hum.
pulling V6, V7, or V8....hum is gone
hum is heard in a second amp fed from preamp out jack
no hum is heard in a second amp fed from effects send jack.
i'm not sure what to check next....i've metered all the resistors associated with V6-V8 and they are fine. not sure about the caps. any ideas? thanks for your help!
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