Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes Nagrania XL 0257

Matched Pair General Electric GE 6SJ7 6J8P Vacuum Tubes Nagrania XL 0257This 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.

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

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

I am playing them one at a time using a 6C4 to 6J5 adapter in one of my RC-2 monoblocks with Super Furry Animals' "Radiator" and they sound excellent

This is a wonderfully-cheesy LP

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

I have played it in my Schiit Audio Vali 2 headphone amplifier and it sounded great

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

CHINA IS AN EXCELLENT EXAMPLE

mesh plate number / type 77 tubes was tested on our Paul Hart-calibrated TV7/U for shorts

This new old stock-TESTING National Union 807 output tube was tested on our Maxi-Matcher 2 for shorts

Transconductance was 1530 for Tube One and 1430 for Tube Two where new/nominal is within one standard deviation of 1900

Tube One measured 60 while Tube Two measured 70 where minimum (65%) is 46 and 100% is 71