Matched Pair RCA 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing Veracini Scarlatti The picture of the movement

The picture of the movement was taken before it was sent to be serviced

2 milliamps' plate current while Tube Two drew 40

it has a top D getter: a micanol base for resistance to heat

54/52 where minimum (65%) is 40/40 and 100% is 62/62

new in box Sylvania 6Z7G tube tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair RCA 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing Veracini Scarlatti The picture of the movementThis new old stock testing matched pair of RCA 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 43 while Tube Two measured 46 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