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

Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIBThis new old stock, new in box matched pair of GE MANUFACTURED 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 38 41 for Tube One and 42 41 for Tube Two (RCA LABELED) where minimum (65%) is 32 32. These tubes have copious bottom flashing, bottom, D getters, steel plates and steel suppost rods. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES.

66 and 74 where minimum (65%) is 57

Tube One measured 76/76 and Tube Two measured 79/77 where minimum (65%) is 50/50

Tube Two (diodes): 36/38

nicely-matched pair of Ken-Rad 6SJ7s was tested on our Paul Hart-calibrated TV7 for shorts

This new old stock-testing matched pair of Ken-Rad 6V6GT output tubes was tested on our Maxi-Matcher 2 with 400 volts on the plates and a bias of -36 volts for shorts

Telefunken-style top O getters

These tubes have lyre-shaped getters

This new old stock-TESTING milspec Sylvania JAN-CHS-5933 / 5933 / 807W / FU7 output tube was tested on our Maxi-Matcher 2 for shorts

They measured 89/65

These eleven Philco type 24A mesh plate tubes were tested on our Paul Hart-calibrated TV7/U for shorts

Tube one measured 30 in its triode section where minimum (65%) is 25 and 100% is 38

They are not 6SN7s