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#2
03-04-2013, 01:56 PM
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3CU3 draws a bit more filament current (280 mA vs 220). It also has a bare filament, as opposed to the 3A3 which uses an indirectly heated cathode.
Close enough for testing, but I would suggest getting the right tube. TV high voltage tubes are in limited demand, and generally sell at dirt cheap prices. 
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