Any guidance for buying used tubes?


Preamp tubes, to be a bit more specific. If I get info from the seller regarding amount of use, what else would be helpful in deciding whether to purchase?
tonyptony

Showing 1 response by tonyptony

A raft of great advice. With regards to testing, I've seen some test results that are described in just a number like 70 or 80, that is related to some kind of percentile value, and then other test results that are "x - y" where x is mA and y is mA/V. How do these methods relate to each other? Are they saying the same thing?