Alright i hope somebody can help me, I have an Ampeg B4-R, but there is a problem a few practices ago it would hum almost as if it was feeding back and the peak light would be contantly on (gain is set as it should) and i had to turn it off then on again to fix the problem. Now last night at practice i was getting no peak (light), no limit (light),unless i cranked the knobs. Also it wasn't putting out much tone/sound all together. the type of sound i was getting was that of a really crappy practice amp with an overdrive pedal. Anyone have any idea whats the pill for my sick amp? I'm mono-bridging it through an SWR Goliath Sr. And yes time is of the essance.