I've seen receiving tubes ( power tubes - 6V6 size) with perfectly silver
getter coating on the glass, but a blue glow between the electrodes with volts
on - a sure sign of gassiness.
I've also seen a lot of 826/829/832 series tubes with enough air inside that
the filaments won't get red, Which is why I wouldn't touch any of them that
people ask funny prices for. After all, many of them were made for WW2, and
weren't expected to have much of an operational life.
73
Peter G3RZP
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