Quote:
Originally Posted by MuzzcoVW
Continuing this, anyone know why Philco chose the "odd" filament voltages for their SF CRTs? Always been curious about that
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Could you provide more information? What is an SF CRT? I assume you mean the odd lower filament voltage on some Philco CRTs? I suspect they were variants to be used in series string sets? If you check it is likely the filament current matches or fits in with the rest of the series filament string.