|[AMRadio] 100 V filament transformer primary|
bbruhns at erols.com
Tue Feb 20 17:55:24 EST 2007
A rheostat is cheaper and smaller than a variac, offers a softer start on the filament, and because of the temperature
coefficient of the filament, there is a small reduction in filament voltage variation over line voltage fluctuations, although
that isn't much. A rheostat generates more heat, though.
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