Tube DIY Asylum

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What about tiny DC imbalance?

Posted by KurtP on March 12, 2007 at 13:40:04:
The Amity/Karna designs rely on a shared cathode resistor with a dual triode PP topology. Assuming the triodes are perfectly matched, I will get no DC imbalance.
What kind of real world triode-triode matching can I expect (lets assume JJ ECC99 for now), and what will a "no DC imbalance" transformer allow me to operate under?
Or would I be better off with separate cathode resistors, one of which is adjustable?