I have both, a B&K emisions tester and a Hickok 6000A transconductance tester.
The emisions tester is useless for testing 6JB6's beyond shorts or open
filaments. Over the years I kept most of the 6JB6 pulls from my Drakes and
others I repaired. With the Hickok I was able to go through them and pickout
the ones with some life left and match them up. Its amazing how unevenly some
pairs ( or three's ) aged and weakened.
I suggest you buy tubes from RF Parts, Antique Radio Supply, Tube Depot, or
SND. Do not buy used 6JB6's.
73, Gary
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