Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes NOS NIB Ladislas Farago 1971 44 and 48 where minimum

44 and 48 where minimum (65%) is 30

The remaining two are labeled "1X2B

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

There are no technical faults with this pressing and any faults come from the source -- 78 records in this case

(Minimum (65%) is 46 and 100% is 71

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes NOS NIB Ladislas Farago 1971 44 and 48 where minimumThis 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