Matched Pair Tung-Sol 6AK5 6J1 6J2 Vacuum Tubes NOS NIB Number Type Shoulder and if it is

and if it is

This Zaerix 6CU7 / ECH42 tube tested to spec on our Paul Hart-calibrated TV7/U

This nicely-illustrated story book is in very good condition

It's a bit worn in places

new in box Sylvania 12JT6A tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Tung-Sol 6AK5 6J1 6J2 Vacuum Tubes NOS NIB Number Type Shoulder and if it isThis 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.