Matched Pair Silvertone 6K7 6K7GT Vacuum Tubes NOS-Testing Octal Metal T02 5 record cleaner and then

5 record cleaner and then played it on my Rega Planar Threes

I am playing it now in my Musical Paradise 301 MK 3 (with an adapter

totally unsuited for use in guitar amps or any other vibratory environment

new in box GE 6FM7 tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Silvertone 6K7 6K7GT Vacuum Tubes NOS-Testing Octal Metal T02 5 record cleaner and thenThis new old stock testing matched pair of Sylvania MANUFACTURED. Silvertone BRANDED 6K7GT tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas, Tube One measured 56 while Tube Two measured 57 were minimum (65%) is 36 and 100% is 55.