Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes NOS-Testing

Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes NOS-TestingThis new old stock testing, perfectly matched pair of GE 6SJ7s was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 77 for both tubes where minimum (65%) is 40. They have 56 26 188 4 and 61 26 188 4 date provenance 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.

It sounds fine with an occasional pop and tick

excellent flashing and copper support rods

It has writing/notes in a fair amount of the book

Transconductance measured 64 for Tube One and 68 for Tube Two tubes where minimum (65%) is 40

new in box RCA 7AF7 tube tested to spec on our Paul Hart-calibrated TV7/U

This lot of four Ken-Rad number / type 58 stamped- / engraved-base tubes was tested on our Paul Hart-calibrated TV7/U for shorts

They are the new

It’s a good pressing of a 1954 performance from right on the cusp of mono high fi

55 and 65 where minimum is (65%) is 36 and 100% is 55

These three new old stock

new in box matched pair of Canadian GE black

This matched pair of mesh plate Philco number 78 tubes was tested on our Paul Hart-calibrated TV7/U for shorts