4 Ken-Rad 6D6 Vacuum Tubes Black Glass Lot of Four NOS-Testing 12B4A Gebraucht great flashing and side

great flashing and side

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

(New US-made 6AU6s typically test within one standard deviation of 2300 micromhos

This matched pair of RCA 6AQ5 output tubes was tested on our Paul Hart-calibrated TV7/U for shorts

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

4 Ken-Rad 6D6 Vacuum Tubes Black Glass Lot of Four NOS-Testing 12B4A Gebraucht great flashing and sideThis 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