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AC or DC Heater?
AC or DC Heater?
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Old 26th October 2004, 09:08 PM   #1
sauuuuuce is offline sauuuuuce  United States
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Default AC or DC Heater?

Any advantages to using DC or AC for a heater voltage? Tube spec's state that either AC or DC can be used. Just wondering what the more experienced have to say about the subject.
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Old 27th October 2004, 01:17 AM   #2
garbage is offline garbage  Singapore
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Default not experienced

but page 6 of rc10 manual states that "Filament-cathode types of tubes are particularly well suited for operation from a steady source of filament supply voltage such as a battery"

and The heater-cathode construction is well adapted for use in radio tubes intended for operation from a-c power lines.

so this might be a start for recommended usage.

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Old 27th October 2004, 12:57 PM   #3
mcs is offline mcs  Denmark
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Unless you have problems with hum, just use AC. For a linestage or poweramp, I would probably use AC. For a phono preamp use DC.

If you use directly heated tubes with a heater voltage above 2.5V, using DC may be nescessary.

Best regards,

Mikkel C. Simonsen
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