In Reply to: Looking at PP amp designs posted by Wojciech on August 2, 2014 at 11:11:59:
Cathode bias requires constant cathode current: class A. Peak current in either tube is twice the idle current - as one approaches peak, the other approaches cutoff.
Fixed bias allows biasing the tubes at less than half the peak current - getting more power from a pair and/or improving tube life. Distortion in class AB is likely to be more, but depends on the particular tube and operating point.
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Follow Ups
- RE: Looking at PP amp designs - Tom Bavis 06:35:39 08/04/14 (0)