4 Ken-Rad 6D6 Vacuum Tubes Black Glass Lot of Four NOS-Testing 12B4A Gebraucht new in box RCA 6AD7G

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

These nine TCA UY-224 globe

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

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

4 Ken-Rad 6D6 Vacuum Tubes Black Glass Lot of Four NOS-Testing 12B4A Gebraucht new in box RCA 6AD7GThis 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