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Frank111 wrote:What are the important parameters to know in tube matching? The 8 Tung-Sol KT-120's came with numbers on the box from the factory as well as an additional sticker with more numbers on it. One was Gm and another was IP. Probably other info too. I'm trying to determine what's important when matching up tubes on the M-125.
sKiZo wrote:Plate Current (PC) and Amplification (TC) are the biggies ... shorts and leakage tests as well.
A well tested tube should also be graded for microphonics and low noise.