Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing A Talking Picture new in box milspec black

new in box milspec black plate GE JAN-6Y6GT / JAN-CG-6Y6GT tubes tested to spec on our Paul Hart-calibrated TV7/U

This lot of four black glass Ken-Rad 6D6 tubes was tested on our Jackson 648 Mutual Conductance tester for shorts

A nine out of ten

Tube Three: 23

56 and 57 where minimum (65%) is 40

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing A Talking Picture new in box milspec blackThis 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