Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing DVD NOS NIB Is it a Mullard

Is it a Mullard

straight-bottle bottle variety

Transconductance measured 42/31 for Tube One and 44/31 for Tube Two where minimum (65%) is 30/15

Paula Robison

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing DVD NOS NIB Is it a MullardThis 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.