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The problem is that these 01A tubes use the filament as cathode, and the "A" supply has to be very smooth. I tried a heavy-duty DC wall wart, and a battery charger, but they had way too much ripple. I hung more electrolytics across the supply but to no avail. My car was right there so I hooked it up as an expedient. If I were to need 6 volts all the time I'd build a supply but I needed it "right then." I remember those old tar-top car batteries where you could hook to any or all cells.
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Reece
Perfection is hard to reach with a screwdriver.
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