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Novacron problem

Posted by rhinohifi714 on December 7, 2024 at 08:35:24:
I recently purchased a pair of Novacron's
within a few hours of the initial listen I noticed both amps were distorting so I powered them down and found that one fuse had blown in one amp the other didn't blow any fuses.
I did find that one of the 12at7's was bad and one of the 6c33c's was nearly dead. I replaced both and proceeded to warm up and re-bias and set the dc offset.
as soon as I flipped the switch up to play it started making noise to the speaker which I thought was strange since the positive that goes to the speaker was inserted in the test banana, anyway while noise was going on I was able to get the idle current up to the rated 350ma but when checking the dc offset it was pegged to the left and with full rotation of the pot the needle never attempted to move from pegged to the left, I turned it off and have not done anything else.
does anyone have a suggestion ?
I'm for some reason thinking a capacitor or diode but have not got it to the bench yet.
any help or suggestions would be greatly appreciated.