Matched Pair RCA 12SN7 12SN7GTA Vacuum Tubes Black Plate NOS NIB Number 2 Red Seal They measured 52/52

They measured 52/52

This lot of twelve new old stock

new in box RCA 3A3C tested to spec on our Paul Hart-calibrated TV7/U

Transconductance: 1541 / 1532

72 and 75 respectively

Matched Pair RCA 12SN7 12SN7GTA Vacuum Tubes Black Plate NOS NIB Number 2 Red Seal They measured 52/52This new old stock, new in box matched pair of RCA 12SN7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Tube One measured 76 76 and Tube Two measured 79 77 where minimum (65%) is 50 50. They have short bases; tall bottles; D getters; steel support rods; DB and CV batch codes, respectively, and their top mica spacers have two X patterns incised into them. I am playing them