4 Ken-Rad 6D6 Vacuum Tubes Black Glass Lot of Four NOS-Testing 12B4A Gebraucht new in box US-made 3A3

new in box US-made 3A3 / 3A3A / 3A3C / 3AW3 / 3B2 tubes tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA 6AD7G tube tested to spec on our Paul Hart-calibrated TV7/U

This pressing has lightly-moderate surface noise audible in quiet passages and barely-audible in moderate passages and louder

new in box GE 6U8A (ECF82 / 6AX8 / 5KD8 / 6KD8) pentode/triode was tested on our Paul Hart-calibrated TV7/U for shorts

great flashing and side

4 Ken-Rad 6D6 Vacuum Tubes Black Glass Lot of Four NOS-Testing 12B4A Gebraucht new in box US-made 3A3This lot of four black glass Ken Rad 6D6 tubes was tested on our Jackson 648 Mutual Conductance tester for shorts, gas and transconductance. There were no shorts or gas. They tested (from left to right) as follows: 81%, 106%, 109%, and 117% respectively. New nominal is within a standard deviation of 1600 and the Jackson expresses this as a percentage. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT