Tube DIY Asylum

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Will direct coupling shorting tube life??

Posted by bouncy ball on May 20, 2012 at 19:04:57:
I ask because my pair 2a3 suddenly tested from medium good to borderline in a month.

My friend suggest I should give it up because the complexity of the power supply but I don't think I am ready to throw the towel yet.

My question is if I can tune the 2A3 to suggested operating condition, let the driver tube and 2a3 filament light up first with separate tranny, delay the B+ for above 1 min, at the same, use tube voltage regulation to ram up the B+ from zero to 425v. Will the nature of such kind of circuitry , I mean direct couple, the higher plate voltage shorten the tube life? Is there anything I need to address?

Thank you

Wal