Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB Philharmonia where minimum (65%) is 25/25

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

Transconductance measured 24

This pressing has light surface noise audible in quiet passages and barely audible in voice-level passages

They are dead quiet when the preamp is muted and sound good even with 6

This Tung-Sol 6L6GC was tested on our Maxi Matcher 2 for shorts

Matched Pair General Electric GE 12SL7 12SL7GT Vacuum Tubes Valves NOS NIB Philharmonia where minimum (65%) is 25/25This 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.