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

Leslie Parnas

The dynamic range and Mu readings

new in box matched pair of Ken-Rad JAN-CKR-2C22 / 7193 milspec triodes was tested on our Paul Hart-calibrated TV7/U for shorts

IF AN ITEM IS MARKED "DELIVERED

Transconductance measured 48/48 for Tube One and 52/46 for Tube Two where minimum (65%) is 32/32 and 100% is 49/49

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