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Original Message

RE: Questions about 6BG6G amp build (schematic) Grommes 216BA

Posted by PakProtector on May 26, 2017 at 09:26:11:

"It's a nested feedback loop. I would eliminate it and use one loop only. Including the power transformer in the loop does no harm."

Two things; one, Global loop NFB is the worst for creating stability issues, and IME it sounds the worst. This NFB is also balanced, and reduces the output impedance directly which helps with bandwidth in and of itself. It also linearizes/reduces distortion faster than SE on a per dB application.

Second, why would you put the power trans in the loop? I suspect you meant OPT...LOL
cheers,
Douglas