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In Reply to: RE: Anything to be gained or loss by two chokes in series vs. one in PS? posted by Paully on May 14, 2012 at 14:42:46
I believe a power supply should have less than 120 ohms resisistance including the chokes, transformer secondary & tube rectifiers feeding an amp requiring 100-140ma current at idle (no signal input). I design for a 50% current increase with 16ms voltage recovery. I hear no difference when compared to ultimate shunt regulated designs. I am also referring to SET amps that are more critical than class A push-pull amps.
You will forgive my while I discuss the concepts with my tutor! I haven't seen any chokes at 20H with less than 181 ohms, but I wasn't looking that hard either.
I wonder how much of the class A problem (or challenge) is due to having the tube cross into A2 on signal peaks. Most of us probably have the tendency to over-drive our amps. A2 peaks will draw more current and thus cause voltage fluctuations with a high resistance power supply.
In A2 the 'extra' current is from the grid
so it is drawn from the driver not the plate.
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