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The 5U4 has a 5-volt filament and 3 amp draw but peak rated for 1 amp per plate, thats 15 watts just for the heater!
3DG4 is a 3.3 volt filament but rated at 1.2 amps per plate, so you get more for less heater W.
PM me if you need any factory info for the SC. I have a good Zenith collection from 57-64
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