Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Valves NOS NIB Sonotone NOS NIB This quad of US-made 6211

This quad of US-made 6211 dual triodes was tested on our Hickok 800 for shorts

1941 in fulfillment of a US government contract for which WE had insufficient capacity and had to subcontract out

They measured 62 and 76 where minimum (65%) is 46 and 100% is 71

These four new old stock

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Valves NOS NIB Sonotone NOS NIB This quad of US-made 6211This 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