These RCA USA made 6SL7 GT tubes test:

51-59/32

55-51/32

on my TV-7D tester (calibrated 1/27/24). Brand new tubes should test 49-49/32 or higher. Tested for shorts, emission, gas and noise.

They are dusty and I prefer to leave them that way; but if you do use them they will clean up gorgeously. Both tubes have the same “K2E” date code for March-April of 1943. The boxes are marked US ARMY. The tubes are in EXCELLENT shape; especially considering they’re 80 years old. The boxes have seen better days but are still holding up well.

See the pictures for condition and ask questions. I do not accept returns unless the items are not as described.

I’m in the process of listing thousands of tubes. If you want something in particular message me to see if I have it. Thanks!