Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing June 18 2025 They have engraved / hot-stamped

They have engraved / hot-stamped bases on is Champion-branded and the other is Zenith

new in box GE 7025 (12AX7 ECC83) dual triode for your Univalve or other application requiring a single 12AX7-type tube

goal post getters

I am playing it in Bottlehead Crack headphone amplifier as a 12AU7 substitute and it sounds excellent

This tube has steel support rods

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing June 18 2025 They have engraved / hot-stampedThis 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.