I am also a new .50 caliber + owner and i am fighting a high end sizzle that I can't seem to get rid of. I tried a 12au7 but I think it's too low gain. I have tad power tubes and tried some jj's which sounded worse. I have a jj 12ax7 a mesa boogie 12ax7 and I think the other 2 are eh.I can't get...