This is probably a bad idea, for tubes over a few hundred watts power
rating. Most ceramic metal tubes require cooling under the base, and for
a few minutes, might still overheat the cathode/heater. If it were me, I
would talk to the manufacturer of the tube for their recommendations.
John
K5PRO
Date: Sun, 19 Feb 2017 16:10:02 +0000 (UTC)
From: Roger Parsons <ve3zi@yahoo.com>
To: Amps <amps@contesting.com>
Subject: [Amps] Checking Filament Voltage
> 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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