[R-390] Tube heaters on DC

[g kwitka]

A friend of mine told me that if I run my tube heaters
on regulated DC instead of AC I have to reduce the
voltage by roughly  .7 becasue of the duty cycle of
the AC. He does that on tube amps claiming there is
less inherent noise with the filaments being powered
by regulated DC.
Can any of you give me any advice on this?


		
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