> HV is no danger to the emissive surface unless cutoff bias is removed
> during the preheat period.
In most cases gg triodes aren't actively biassed off, they
are self biassed at a very low current level by having a
high value resistor in the cathode. That limits the maximum
cathode current to a low level which is very unlikely to
damage the cathode even if anode volts are applied during
warmup.
Steve
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