In Reply to: uf value change - coupling caps posted by Devils Advocate on August 18, 2015 at 10:08:59:
The right size is calculated by the engineer. Too big and you have the grid bias problems as well as potentially providing more subsonic garbage to rob power. Too small and you have low frequency cut off and phase anomalies to contend with. The size of the coupling cap is a trade off Denis made. If you think that he chose the wrong value and that the amp can be improved by a simple change in the coupling cap value leaving the grid resistor the same, you are deluding yourself.
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Follow Ups
- Bigger Ain't Always Better - Chip647 15:54:58 08/19/15 (0)