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Old 16th September 2008, 02:36 AM   #1
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Default Aikido filament question

Should I worry about driving my 6SN7's with a 12.6 vdc supply and filament voltages dividing between tubes. I'm measuring a high of 6.4
and a low of 5.9vdc. Will this have any audible consequence?? Has anyone used AC filament with the Aikido??
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Old 9th October 2008, 08:25 PM   #2
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Anyone want to take a shot at this one????? Surely not to tough for this site!
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Old 9th October 2008, 11:03 PM   #3
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You should be Ok wiring them in series, although if one goes open neither tube will heat and if one shorts you get the 12.6 across the other. I have my 4 wired in series and never had a problem....

Fran
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Old 10th October 2008, 12:38 AM   #4
SY is offline SY  United States
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If you're running them in series, you should have a constant current heater supply. And beware of heater-to-cathode voltage ratings!
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