Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 Tube One drew 21

Tube One drew 21

These tubes have great bass and sparkling highs and Mann's voice is warm and clear as a bell even though they test on the cusp

They have been tested on our Paul Hart-calibrated TV7/U (where minimum (65%) is 45) and have the following values in descending order: They measured 57

a 56-35 date and excellent flashing

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 Tube One drew 21This new old stock testing 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 44 while Tube Two measured 48 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