Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 These tubes have great bass

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

Kreisler and Bach played masterfully by Abramas Sipolniek on Organ

new in box Hytron 12BA6 tested to spec on our Paul Hart-calibrated TV7/U

They are exactly-the same on the inside

Tube Three measured 58

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 These tubes have great bassThis 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