Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes Valves NOS-Testing March 26 2023 new in box matched pair

new in box matched pair of RCA 12SN7GTA dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

They measured 28

The performance is excellent and heart-felt

This East German pressing is pretty good

This hard cover book is in very good condition

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes Valves NOS-Testing March 26 2023 new in box matched pairThis new old stock TESTING 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 59 for Tube One and 60 for Tube Two where minimum (65%) is 40. Both have 939 date codes. I am playing them as I write in my Musical Paradise MP 301 MK3 and they sound excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT.