I have an SV20H. I was moving some cables around. I made THE cardinal sin. The speaker cable going to the cab was not pushed in all the way when I powered the amp on, and I did attempt to play through it. (I know, I know, I know. Mad at myself.) Now I have no sound from my amp, with one exception. If I strike a chord and turn the power to the amp off, as it powers down the chord can be briefly heard before the power is completely gone. I have the chassis out. Not visible burns on the board. Fuses do not appear blown, but haven't checked them. Tubes look OK, but looks can be deceiving. Does anyone know 100% what's going on here?