Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing June 18 2025 This tube has steel support

This tube has steel support rods

new in box RCA 6BK7B tube tested to spec on our Paul Hart-calibrated TV7/U

Tube Two Transconductance: 2610

These four Ken-Rad tubes tested as follows on our Paul Hart-calibrated TV7/U:

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing June 18 2025 This tube has steel supportThis 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 64 for both tubes where minimum (65%) is 40. They have DM and 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.