Vintage Asylum

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Harmon Kardon Cit-II Trouble Shooting Question

Posted by Charlie8521 on October 27, 2022 at 08:42:05:
So I have a Cit-II that had been fully restored with new Gold Lion KT-88's, to include smaller tubes. Trying to determine if it is a circuit failure, a simple bad tube, or I should have monitored the biasing closer for new tubes.

After approx. 180 hours developed noise in one channel. Wiggled V-9 and determined it was the problem. Tried to pull it and it was stuck. Finally came loose but the large plastic center pin broke off and had to be driven out with a wooden dowel (ahh, over heated, tube appears burned but never noticed any redness when running).

So, can I determine if it was a simple faulty tube by just pulling all of the KT-88's, firing it up, and comparing voltages at the pins to the other KT-88 sockets? And should I do this leaving the small tubes in place?

Thank you in advance, Charlie8521