Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 a 56-35 date and excellent

a 56-35 date and excellent flashing

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

Tube Three measured 58

Tube One drew 21

new in box Philco 3AL5 tube -- and several others just like it --tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 a 56-35 date and excellentThis 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