Quote:
Originally Posted by N2IXK
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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ok so if the set calls for 3a3 i should not use the 3cu3a. ill have to look because my 64 rca had the 3cu3a in it but i replaced it with the 3a3 so ill see the tube layout if its even there dont remember.