Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 They are exactly-the same on

They are exactly-the same on the inside

Kreisler and Bach played masterfully by Abramas Sipolniek on Organ

Tube Three measured 58

Tube One drew 21

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing TA2 They are exactly-the same onThis 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