14-07-2011, 08:40 PM
I seem to remember reading somewhere that adjusting the filament current acted as a volume control in these early sets, with the bonus of extending battery life.
Andy
Andy
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Variable filament current?
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Variable filament current? - by fido - 14-07-2011, 08:25 PM
RE: Variable filament current? - by Andy M0FYA - 14-07-2011, 08:40 PM
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