Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing DVD NOS NIB This mesh plate RCA Cunningham

This mesh plate RCA Cunningham Radiotron number 78 tube tested 54 on our Paul Hart-calibrated TV7/U where minimum (65%) is 36 and 100% is 56

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

This RCA 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

excellent flashing and three horizontal holes underneath and parallel to the plates' short axes

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing DVD NOS NIB This mesh plate RCA CunninghamThis 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.