Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes Valves NOS-Testing JW-6AK5 and if it is

and if it is

There is a shield between the triodes for reduced cross talk

I will test it

64 and 65 where minimum (65%) is 40

This matched quad of GE black plate 6CL6 tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes Valves NOS-Testing JW-6AK5 and if it isThis new old stock testing, perfectly matched pair of Sylvania 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 58 for Tube One and 60 for Tube Two where minimum (65%) is 40. Both have bj date codes. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. They are lightly microphonic and not suitable for environments with