Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB Philharmonia Transconductance measured 24

Transconductance measured 24

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They measured 86/82

where minimum (65%) is 25/25 and 100% is 38

100% is 77/77

Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB Philharmonia Transconductance measured 24This 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.