Matched Pair Silvertone 6K7 6K7GT Vacuum Tubes NOS-Testing ECF80 T28 This hardcover book is in

This hardcover book is in very good shape

This new old stock-testing pair of Sovtek 6BQ5 / EL84 / 6P14 / 6P14P output tubes was tested on our Maxi-Matcher 2 -- with 325 volts on the plates and a bias of -14 volts -- for shorts

Plate current draw was 52

new in box Telefunken PL82 tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair Silvertone 6K7 6K7GT Vacuum Tubes NOS-Testing ECF80 T28 This hardcover book is inThis 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. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE "LOWTECHTWOO" AND OR CALL OR TEXT US AT