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-   -   AC or DC Heater? (http://www.diyaudio.com/forums/tubes-valves/43861-ac-dc-heater.html)

sauuuuuce 26th October 2004 09:08 PM

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.

garbage 27th October 2004 01:17 AM

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.

rgds
garbage

mcs 27th October 2004 12:57 PM

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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