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Re: I hesitate to use a cap-input filter in any amplifier...

Absolutely. The switching noise is wideband. Your main AC component is at 120 Hz and you probably need two sections to deal with that. But a third section using a smaller choke will be needed to remove the ultrasonic crud. You might want a common-mode choke, too. And don't forget your snubbers across the input choke.

Jones has a section on this in his book.

Another trick is small parallel RC traps in the transformer output leads tuned to the secondary resonant frequency. That one was from John Camille.

-Henry

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