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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.
Follow Ups:
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.
Chris
In A2 the 'extra' current is from the grid
so it is drawn from the driver not the plate.
DanL
Right, but it all comes from the power supply.
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