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i just got a Musicmaster Bass amplifier in a trade for some motorcycle parts and it sounds great.....................until the amplifier warms up, then it sounds like a television tuned to a channel that isnt there, makes that "snow/white noise" sound. the tubes all LOOK ok with nothing inside them broken loose and they dont have that white looking residue filling the insides either. i have never owned a tube amplifier that gave me problems so this is all new to me. i A< experienced with electronic repairs and i can do PCB soldering it's just the diagnosis part i have problems with. any clues? i really cannot afford to take it in and pay the 75 dolllar diagnostics fee. it appears that the problem begins once the amplifier really warms up.
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Truthfully, it could be any number of things.
Just coming out and saying "Oh yeah, it's the ..." is not feasable.
I may be totally incorrect in this assumption.
The amp needs to be opened up & systematically diagnosed.
My first thought though, is a leaky coupling cap between stages.
If you have the equipment it may be possible to walk you through the repair.
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