Dave,
I made it through my tube caddies and unfortunately don't Have any 6SJ7s. I do have four 12BY7As. I checked them on my calibrated Tripplett and they measured;
RCA 8700
Westinghouse 8200
RCA 7100
Halicrafters 6400
Minimum good is 7100 on the Tripplett. The RCA and Westinghouse both have round getters. The plate structures are pretty darned close but not an exact match.
You are welcome to all of them, gratis. I work at 40 and Lindberg if you want to try and meet me somewhere in that general area to pick them up. If you want to zip out to the house over the weekend, you can do that too.
Lemme know.