rijo1 writes:

No Ken , the tubes are used in a RF circuit . I can't take a amp reading off the
circuit without loading the circuit with RF . That is the problem .
The voltage is too high and is driving the tubes too hard and turning the plates
RED in a matter of seconds . The tubes cost $ 93.00 each and I don't want to
kill them . There is no RF on the filaments but only on the plate caps . Thanks
,

That's not a filament voltage problem. There is a wide range of voltages
over which the system should work properly.

You are reducing the life of the tubes but not affecting operation
significantly. Fix the voltage problem, preferably by obtaining a
proper transformer, but there is most definitely something else wrong.

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