07-26-2014, 10:38 AM
So I have several 7027a's laying around. I have a bias probe from Eurotubes that tells the current of each tube when off standby. My range of several US made 7027a's in ma is 21.4-34.1 while in the amp. I was able to find four in the 31-34 range that I have in my V4B. I stuck two in the 25 range in my VT-22.
My question is: what is considered new, and what is considered the minimum good threshold?
My question is: what is considered new, and what is considered the minimum good threshold?