Tube Tester Mutual Conductance Falling - What it Means?
I just purchased 16 used KT88's and tested all of them in my calibrated Hickok tester. Eleven of them had stable readings between 4700-5600 umhos. Five had readings that started up in the 4600-5000 range but fell to the 3900-4200 umhos range before stabilizing (I'm not sure they fully stabilized, but the falling slowed down a lot).
Can someone tell me what such a falling reading means? Is the tube weak or unreliable or ????. Thanks, Peter
Hey Bud, I hope your still around. I see your avatar is a triplett 3444. I am restoring one and want to know if you have any photos or can tell me about the mods you made to yours. I can see you have a plate current meter, that's something I'd be interested in doing. My email is theschlepp@gmail.com Thanks, Eric |
