Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB 5654 Mini Mite -- GE 6L6GC output tube

-- GE 6L6GC output tube was tested on our Maxi-Matcher with 400 volts on the plates and a bias of -48 volts for shorts

new in box (for Tube Two) aesthetically-matched pair of gray glass RCA 12SL7GT dual triodes was tested on our Paul Hart-calibrated TV7/U for shorts

These two Hytron 7C4 tubes tested to spec on our Paul Hart-calibrated TV7/U

Transconductance readings are 46

nearly-perfectly-balanced RCA clear top 6CG7 / 6FQ7 dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB 5654 Mini Mite -- GE 6L6GC output tubeThis new old stock, new in box matched pair of GE 12SL7 12SL7GT dual triodes was tested on our Pau Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 40 50 for Tube One and 45 45 for Tube Two where minimum (65%) is 32 32. These tubes have copious bottom flashing, bottom, dimpled sheet getters, steel plates and steel suppost rods. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT