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Questions about tubes and gear that glows. FAQ

RE: Can you bias each tube individually?

Not ware of any amp that can't take both KT88's and 6550's.

Jolida lists both for this amp, as you mentioned.
So.. you may have bad KT88 as well.
Or something in the amp that is killing tubes? Fun, no?

If you can bias each tube individually, you can just get a single 6550.

Unless this is a used up set, then I'd just get a new set and leave this trio for backups.

The bets tube advice I have received here has been: clean the pins and sockets. Amazing how many issues this can fix. Just passed this on by my ex-bro-in-law a month ago when one of his guitar tubes was making a racket.

Not sure it will help, but can't hurt.

KP


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