Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-Testing

Matched Pair Sylvania 6SJ7 6J8P Vacuum Tubes NOS-TestingThis 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 59 for both tubes where minimum (65%) is 40. They have 939 and 252 date codes, respectively. 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,

This Amperex 8020 half-wave rectifier tube was tested on our Paul Hart-calibrated TV7/U

there is no dust jacket

peppy and alive

beautiful side flashing

Tube Three:

Transconductance measured 49 for Tube One and 52 for Tube Two where minimum (65%) is 36 and 100% is 55

This matched pair of Tung-Sol 6C6 tubes tested 43 and 44

There were no shorts or gas and they measure as follows:

shields between triodes to eliminate crosstalk

These three GE-MANUFACTURED

new in box industrial-grade GE 6679 / 12AT7 dual triode was tested on my Hickok 600A for shorts

All four tubes' diodes tested fine as well