Maybe, I have no idea. It has 6l6’s installed. I replaced it with the factory 91k resistor. Thought about putting a variable 100k potentiometer there but for now the 91k. This amp had several owners I believe before me. I’ve done the few easy gain mods too. Re doing all the tolex for the amp and I’ve found a carvin cab to refinish as well. I’ll post the pics when I’m done.