I do not see a master control reset. I have unplugged it and re-plugged it. I opened it yesterday and nothing seems to be loose. There is not a wire going to the pre amp out. I can hear it humm if you turn it up really loud, but nothing when you plug the instrument or any cord into any one of the 3 jacks in front.
Research, Knowledge and Information :
Peavey Ecoustic 112 Guitar Amp | eBay
Peavey Ecoustic 112. Great amp. Works great. Good sound. 2 channels. Has (2) 1/4" inputs and (1) XLR input so two acoustic guitars and one microphone can be used at ...