alright guys so this might be the wrong forum (excuse me im new) but im having problem with an amp head i just bought. Its and ampeg svt-ii pro (the 80s model). the problem is the master control isnt doin anything, i can turn it down all the way and still get sound but not much or i can crank it all the way up and still get the same amount of sound. is this a resistor problem? or maybe the tubes?
possibly ur imput volume is low lol. i would dount it. id have a looka t the schematic first see what could be the problem.
It might be a lemon. I would send it back and ask for a replacement.

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or if you called ampeg, you could just ask them if THEY know the problem?

sometimes a company knows about a certain problem that happens a lot with one of their amp models.