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Old 20th June 2007, 02:01 AM   #1
diyAudio Member
Join Date: Jun 2004
Location: Indiana
Default High Voltage Heater info

I am intriqued by high voltage heaters. Does anyone know of some good sites for information on different tubes with heaters running on a couple dozen volts or more? Would be interesting to see how various tubes compare to the more common low voltage heated types.

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Old 20th June 2007, 02:39 AM   #2
jnb is offline jnb  Australia
diyAudio Member
Join Date: Dec 2006
As far as I know they are otherwise the same and were made that way for specific matters of convenience.

One benefit I could see is that a larger portion of the heater would be more positive than the cathode in grounded heater applications thereby improving heater supply rejection.

For those of us that float our heaters for this reason, it may actually make it slightly more critical when keeping within Vh-k limits.
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Old 20th June 2007, 03:47 AM   #3
diyAudio Member
Join Date: Jun 2004
Location: Indiana
I would think that the lower heater currents would also make induced hum easier to avoid. My thought is for AC heater drive from seperate transformer.

There is probably a lot of NOS for many of these tubes available but I doubt that there is any current production which could be a problem in the future.

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