Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes bumpus excised chevrons in their top

excised chevrons in their top mica spacers as well as 210 5439 and 5413 provenance/date codes

Tube Two measured 25/1860

new in box Cunningham 35/51 tube tested to spec on our Paul Hart-calibrated TV7/U

Tube One's etching is "5654" while Tube Two's is "6AK5

This variety has black

Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes bumpus excised chevrons in their topThis nearly 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 46 for Tube One and 48 for Tube Two where minimum (65%) is 40. They have 1 43 188 5 and 3 52 188 5 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.