So I just bought a used Laney GH100L and the thing has no volume. It's like a 5 watt SS amp. It has sound and it doesn't fluctuate. Does this sound like an OT issue? I have replaced all the preamp tubes and the 6L6 power tubes all light up and don't seem to be red plating. I will replace them tonight. I know these amps have OT issues. I will be pissed if the OT is dead. They are 270$ new from MM.... Thanks for any feedback.... No pun intended.