1 Miguel Gregori 5 years ago Hi! Billy, I posted this topic in the bass section whitout no feedback, so, maybe you could help me on this: have two similar "220 Model" solid state bass Acoustic heads One is quite loud although prone to overdrive(behaving like a tube amp)at high volume. The other one sounds quite weak, compared. What's wrong? I don't hear the common weird false harmonics or "motorboating" of dried caps. Also the pilot light takes a few minutes to shut down completely after use.