Matched Pair General Electric GE 12SN7 12SN7GTA Vacuum Tubes NOS NIB 81266-1 Stereo LP milspec Sylvania JHS-12AT7WA (12AT7 /

milspec Sylvania JHS-12AT7WA (12AT7 / ECC81) dual triode was tested on our Paul Hart-calibrated TV7/U for shorts

25 and 26 where minimum (65%) is 21

Tube One (Unitron 5654-LABELED

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

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

Matched Pair General Electric GE 12SN7 12SN7GTA Vacuum Tubes NOS NIB 81266-1 Stereo LP milspec Sylvania JHS-12AT7WA (12AT7 /This 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