[AMRadio] Tube checker gas check vs real world

[w5jo at brightok.net]

I have a Western Electric version of one of the Hickok testers and to check 
power tubes like that the first time I put it in the checker and let it stay 
for about 15 minutes to let the filament heat.  The I do the normal test 
recommended and  leave the test button pushed for about another 15 minutes 
then follow that with the gas check.  It has been a good test for me.  I 
also thump the tube to see if it is microphonic.

Jim
W5JO

-----Original Message----- 


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.

Charlie, W4MEC in NC