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August 2nd 05, 05:22 AM

On 8/1/05 9:07 PM, in article , "Chuck Harris"
wrote:

wrote:

NOT. The resulting reduced emission shortens, not lengthens, tube life
in most cases.

I've heard that, and it makes me wonder if the reduced life is only as viewed
with the tube running at the reduced voltage. If you take a tube that has
reached end-of-life with a reduced heater voltage; I wonder if it would still
have a bunch of time left at the correct heater voltage.

I suspect it would. In the early days of radio, filament voltage rheostats
were sometimes used to control volume. Also as tubes aged the voltage was
cranked up to keep it usable.

Don