This Sylvania USA made 6SN7 GTA tube tests 103-105/50 on my TV-7D tester (calibrated 1/27/24). Brand new tubes should test 77-77/50 or higher. Tested for shorts, emission, gas and noise.

The top is dated “E4B” for May 1954. The “444” warranty code is November of 1954. This 70yr old tube is in excellent shape.

I bought this in a lot from a retired military serviceman who said he purchased it as bulk/loose NOS and it was a spare for his system. I listed it as “open box” because I don’t have original packaging. 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!