Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-TestingThis 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

These tubes draw 1

It has outstanding silkscreening and flashing

new in box Philco 7K7 tube tested to spec on our Paul Hart-calibrated TV7/U

Four are civilian and one is milspec

new in box GE 12ED5 tubes tested to spec on our Paul Hart-calibrated TV7/U

coated glass 50L6GT tubes was tested on our Paul Hart-calibrated TV7/U for shorts

new in box US-made 17DQ6 / 17DQ6B / 17GW6 tubes tested to spec on our on our Paul Hart-calibrated TV7/U

Tube One measured 55 while Tube Two measured 62 where minimum is 34 and new is 60

I have played it in one of my ArtSound 805 monoblocks and it sounds excellent

This new old stock-testing almost-perfectly-matched pair of Sovtek 6BQ5 / EL84 / 6P14 / 6P14P output tubes was tested on our Maxi-Matcher 2 -- with 325 volts on the plates and a bias of -14 volts -- for shorts

This RCA 872A rectifier tube appears gently-used

This new old stock-testing -- and looking