[Amps] Checking Filament Voltage

[Roger Parsons via Amps <amps@contesting.com>]

I am busily making a replacement amplifier using a metal/ceramic filament tube.

I would like to coarsely adjust the filament voltage before I install the 
blower. (The amp is built into an existing cabinet and the filament transformer 
is a fair way from the tube.) My question is: Is it permissible to run the tube 
with only filament voltage and no air for a short period? If so, what is a 
short period?

Thanks

Roger

VE3ZI
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