[AMPS] filament rheostats

[Frank & Barb Ayers]

Peter wrote -
Better, but even more expensive, is a regulated filament supply that is
current limited so the inrush current can't exceed twice the normal current,
and doesn't vary with line volts. You can afford to build that sort of thing
into a home brew amp.......but commercially it's a no-no.

I've thought of doing this but - is there any problem with running filaments
on DC? Seems to me I heard at one time that some tube manufacturers
recommended against that.


Frank
W2FCA


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