Matched Pair Tung-Sol 6AK5 6J1 6J2 Vacuum Tubes NOS NIB JTL5702WB Milspec This Sylvania 6SF7 tube tested

This Sylvania 6SF7 tube tested to spec on our Paul Hart-calibrated TV7/U

There were no shorts or gas and it measured as follows:

1-25 188-5 and 1-04 188-5 date/provenance codes

EIA Factory Codes: none

Matched Pair Tung-Sol 6AK5 6J1 6J2 Vacuum Tubes NOS NIB JTL5702WB Milspec This Sylvania 6SF7 tube testedThis new old stock, new in box matched pair of Tung Sol 6AK5 tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and they tested as follows: Tube One (Philco LABELED, Tung Sol MANUFACTURED) measured 30 while Tube Two measured 31 where minimum (65%) is 22 and 100% is 34. I am playing them now in my Mini 2013 as I write and they sound excellent. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.