Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes Nagrania XL 0257 new in box Amperex 9ED4

new in box Amperex 9ED4 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box US-made milspec JRC-6AK6 / CV1762 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box Westinghouse 6S4A tubes tested to spec on our Paul Hart-calibrated TV7/U

48 and 51 where minimum (65%) is 32 and 100% is 49

Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes Nagrania XL 0257 new in box Amperex 9ED4This 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.