So i just picked up a AB165 and i'm getting a slight hum out of it. When i had it hooked up to a Ampeg 6x10, playing bass through it, it wasn't really noticeable. But once hooked up to a 4x12 cab and playing guitar through it. its really noticeable. i've opened it up and everything looks good inside, including the filter caps. Im guessing that it has something to do with the way that bias works in this amp. So i was thinking about re-wiring it to a real bias. But my question is, what should the bias be set to and where should i measure off of?
Also side note. In the filter caps the big 2 70uf have been changed but the others are mallory's. they look completely fine. But, could they cause problems even if they're not physically damaged?
Also side note. In the filter caps the big 2 70uf have been changed but the others are mallory's. they look completely fine. But, could they cause problems even if they're not physically damaged?
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