Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes Valves NOS-Testing March 26 2023 These six US-made 84 /

These six US-made 84 / 6Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

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

They measured 28

I have played it in my Bottlehead Crack headphone amplifier and it sounds outstanding

This hard cover book is in very good condition

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes Valves NOS-Testing March 26 2023 These six US-made 84 /This 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.