On 05/09/15 04:00,
nemo zilch <email@example.com>
> My inclination is to adjust the current so that the
> voltage across the tube is 12.6 volts. Does this seem like the correct
> thing to do?
I was looking at similar using a programmable switching supply. Once
the tube warms up fully, the current will normally drop off - except in
your case it won't be doing that. Also, if "other" undefined RF
conditions cause the heat in the tube to drop then I think you might
discover some uncharted territory the tube designers never imagined.
Constant current heat-up time will be longer than constant voltage as well.
Any it has to be asked, why? Just simply cold-start the filament in the
traditional manner. It's robust and inexpensive, and it doesn't provoke
the designers into adding another chapter to their do's and don'ts for
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