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RE: A critical inductance choke input filter....

Some people say that only AC heating of direct heated triodes sounds good and that DC heating does not sound good.

I think the people that say that have listened to amplifiers where the direct heated triodes are heated with poorly filtered DC.

A bridge followed by a large cap will have saw tooth ripple. Saw tooth ripple will cause the sound to be raspy.

Good filter chokes are expensive (the main reason why you don't see them used much) but worth it in terms of sound.

In general, the ripple from a power supply that uses a input choke will be much lower and what there is of it will be shaped like a sine wave (smooth and round) instead like a saw tooth (hard and raspy).

Tre'
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