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RE: D70 Output Tubes Drifting WHILE Biasing

Posted by Jonesy on March 24, 2014 at 09:38:20:
I'll give the driver tubes a go.

I don't leave the preamp on, or connected, during biasing, per the manual. I just leave the speaker wire hooked up per info I picked up on the Asylum.

There's a phase-splitter tube as well. I have extras of all tubes so will do some switching around.

Hope it's not the coupling caps. I'm not sure which ones they would be. I'm the kinda guy that just replaces stuff and sometimes I get lucky, and sometimes it gets expensive. (LOL.) Still cheaper than sending it in for service. Just me, my DVM and soldering pencil. Thank goodness I have a decent Hakko. Best thing I ever did.

Thanks for your advice.

Will see how it goes tonight.

Cheers!

Jonesy