Matched Pair RCA 12SN7 12SN7GTA Vacuum Tubes Black Plate NOS NIB Number 2 Red Seal Dynamic Range: -77

Dynamic Range: -77

This Super Silvertone 6J7G tube was tested on our Paul Hart-calibrated TV7/U for shorts

They measured 52/52

All measured 1950 micromhos where new/nominal is 2000 and minimum (65%) is 1300

Matched Pair RCA 12SN7 12SN7GTA Vacuum Tubes Black Plate NOS NIB Number 2 Red Seal Dynamic Range: -77This 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