Matched Pair General Electric GE 12SN7 12SN7GTA Vacuum Tubes NOS NIB 81266-1 Stereo LP The used Westinghouse 12D4 tested

The used Westinghouse 12D4 tested as Good on the English scale on our Hickok 800 and had no emissions drop with the filament at five rather than 6

44 and 48 where minimum (65%) is 30

Tube One measured 60/56 while Tube Two measured 61/58 where minimum (65%) is 50/50 and 100% is 77/77

I just cleaned this LP set on my VPI 16

Matched Pair General Electric GE 12SN7 12SN7GTA Vacuum Tubes NOS NIB 81266-1 Stereo LP The used Westinghouse 12D4 testedThis new old stock, new in box matched pair of GE MANUFACTURED 12SN7GTA dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 82 87 for Tube One and 84 87 for Tube Two (Zenith LABELED, GE MANUFACTUREDwhere minimum (65%) is 50 50. They have gray, ladder plates; crenelated, round top mica spacers with an excised square and circle each, O getters; copper