x-101

Greetings All and Hello! I've been reading through this forum like crazy and hope I can get some guidance from all the knowledge here. My apologies if this turns into a bit of a long post. My father purchased this amp new and at some point upgraded to new equipment, put the x-101-c on a shelf...

Hi, I'm currently working on a Fisher X-101-C. The 7591A were all done. It's recaped and I haven't checked posts about improvements . I wanted to know what modern type of 7591A would work best considering the voltages. I also read somewhere that fixed bias models should have the 330K grid leak...