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#5
December 21st 06, 08:13 PM
posted to rec.radio.amateur.homebrew
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Older ARRL Handbooks
Of course, a lot of TV sets were AC/DC, so the filament voltages are all over the map since you'd put them in series to run directly off the AC line. Unless they start with "6" or "12" the tubes may not be so useful. ============================= Being in series means they would all be used with the same filament current which can be easily implemented with a circuit employing a 78xx device in constant current mode (obviously in a DC environment) Frank KN6WH / GM0CSZ |
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