Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Valves 9ED4 T39 Please be sure your device

Please be sure your device has enough current to run them

Enhanced Cooling: no

new in box Sylvania 9JW8 tubes tested to spec on our Paul Hart-calibrated TV7/U

A 7 out of 10

These eleven US-made number / type 27 tubes tested below the cusp -- some far below

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Valves 9ED4 T39 Please be sure your deviceThis matched pair of GE 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 33 while Tube Two measured 34 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 ETSY SISTER SITE "LOWTECHTWOO"