Matched Pair RCA 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing Veracini Scarlatti and Tube One has a

and Tube One has a TE4 date code

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

US-made 7C7 tubes in this lot

is pretty well balanced from triode to triode

This album sounds very good only with occasional pops and ticks

Matched Pair RCA 12B4 12B4A Vacuum Tubes Black Plates Copper Support Rods NOS-Testing Veracini Scarlatti and Tube One has aThis 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