My amp Volume starts to gradually get louder as I turn the volume pot up clockwise, then at about 80% or so, further increases in the pot in the clockwise direction actually reduce the amp volume, gradually a bit. I cleaned the Pot, but not sure if that started the problem. Pot got quitter after cleaning, but still a bit noisy. Could have been there before. What would cause that, Just a bad pot, or something else ? Amp sounds great either way, just weird having the pot work that way, kinda backwards a bit, but not fully. Thank in advance for any help.