[AMRadio] Tube checker gas check vs real world

[Rob Atkinson]

Use a Violet Ray on the 572Bs.  Hold it up to the tube bulb in a dark
room.  If the tube has gas, the ray will illuminate it.   Sometimes
violet rays show up at hamfests.  The other way for RF power grid
tubes is to run the filament for a few hours then put v. on the plate
and gradually raise it every 15 minutes from 500 on up with idle
cathode current.

Rob
K5UJ

On Wed, Mar 31, 2021 at 9:42 AM CL in NC via AMRadio
<amradio at mailman.qth.net> wrote:
>
> I have an old Hickok tube tester that can run a gas check.  What is the real world experience with tubes that pass the gas (ha ha) test on the tube checker, vs being gassy when in a circuit?
> While the information about the gas test says it is aimed at amplifier tubes, guessing they mean primarily, audio amps.  What are your thoughts on testing 572B's for gas?  If they pass the test in a checker that uses comparatively low voltages, guessing that does not mean when I put 2100 on the plate of a 572B it won't flash over.
>