"He probably doesn't think that improving the voltage/current through the PS(or fuse) can positively affect the presentation of an amplifier. Most don't recognize that the power supply IS indeed directly in the "signal path" of the power amp. Every gain device/stage in an amp passes voltage from the PS to the next stage(as modulated by the signal). Then the output devices(whether tube or transistor) take voltage/current(as modulated by the signal) from the PS and connect it to the speakers. That's why it doesn't take much upgrading of power supplies, power cords, room wiring, etc. to yield a major improvement in an audio system's presentation."
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