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

each having four stamped crosses: two upside-down and two right-side up

These nine TCA UY-224 globe

" "I Shall Go Down The Street

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