Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB 5654 Mini Mite

Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB 5654 Mini MiteThis 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

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

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

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

Tube One drew 21

new in box milspec RCA 12SG7 JAN-CRC-12SG7 tube tested to spec on our Paul Hart-calibrated TV7/U

Transconductance readings are 46

new in box RCA 6GF7 / 6GF7A tubes tested to spec on our Paul Hart-calibrated TV7/U

rectangular mica spacers

US Navy markings and excellent flashing

but the stem will not return to Position One

36 and 48 where minimum (65%) is 29

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