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

new in box US-made 6F7 tubes tested to spec on our Paul Hart-calibrated TV7/U

I can't tell you how they sound as we don't have any equipment that runs them

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