Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes NOS NIB Ladislas Farago 1971 This new old stock-TESTING matched

This new old stock-TESTING matched pair of Sylvania 6SJ7s was tested on our Paul Hart-calibrated TV7/U for shorts

Transconductance measured 48/48 for Tube One and 52/46 for Tube Two where minimum (65%) is 32/32 and 100% is 49/49

There are no technical faults with this pressing and any faults come from the source -- 78 records in this case

new in box matched pair of Ken-Rad JAN-CKR-2C22 / 7193 milspec triodes was tested on our Paul Hart-calibrated TV7/U for shorts

(Minimum (65%) is 46 and 100% is 71

Matched Pair General Electric GE 12B4 12B4A Vacuum Tubes NOS NIB Ladislas Farago 1971 This new old stock-TESTING matchedThis new old stock, new in box matched trio of GE MANUFACTURED 12B4A tubes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. They measured 47 and 50, respectively, 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