Hello, I have plenty of parts to use up, and was just wondering if anyone ever uses DC to heat rectifier tubes? I use a regulator to run 6.3VDC to run my EZ81 in my test supply, and noticed less hum in my circuits. Would you be able to do this in a 5AR4 style circuit if you kept the filament supply floating? I've got a pile of LM317T to use up and figured They'd be useful here.
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