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RE: Balance Compensation

Posted by tubetvr on June 30, 2008 at 08:53:29:
Yes, it would be possible to compensate for the gain difference but the output impedance from each tube would still be different meaning that the balance would be lost if the load impedance would vary as it does in a real speaker. The futterman connection, (and some other methods) compensate for the gain and the output impedance difference and the balance is therefore maintaned also when the load impedance vary.

I have feeling that you don't like the Futterman compensation, do you want to explain why?, (I am just curious).

There has been many papers written about methods for how to compensate the unbalance of the SEPP amplifier I can recommend the paper by Hiroya â€œAnalyses of Drivers for Single-Ended Push-Pull Stage,â€ Hiroshi Amemiya, IRE Transactions-Audio, Sept-Oct 1955" that is also mentioned by John Broskie

Regards Hans