Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes NOS NIB Ladislas Farago 1971 Leslie Parnas

Leslie Parnas

44 and 48 where minimum (65%) is 30

The dynamic range and Mu readings

it has excellent flashing

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes NOS NIB Ladislas Farago 1971 Leslie ParnasThis new old stock, new in box matched trio of GE MANUFACTURED 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 47 and 50, respectively, where minimum (65%) is 32 and 100% is 49. Wish I could tell you how they sound, but I don't have any equipment that uses these. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT