That’s interesting that you say the nos tube should be about 50 volts less. My sylvania 5y3 is within 5 volts of the JJ 5y3. I def don’t have cone cry or anything like that. I’ve tried C10R, C10q, vintage C10N, a weber 10, and an Eminence blue frame Alnico (which sounds the best) like I said the the amp sounds absolutely fine up until 6 or so on the volume then after that it gets a horrible non musical sound that is heavily distorted and does not correspond to anything that any genre of music would consider musical. I will try the resistors you mentioned because I can’t find anything obvious that is wrong. unless I have a bad OT. idk.