General Electric GE 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate 115N01OT These US-made 12SF7 tubes were

These US-made 12SF7 tubes were tested on our Paul Hart-calibrated TV7 for shorts

a dimpled-D getter and matte-black plates

new in box milspec black plate GE 6Y6GT / JAN-CG-6Y6GT tubes both tested 56 on our Paul Hart-calibrated TV7/U where minimum (65%) is 40 and 100% is 62

I will test it

This lot of three Raytheon 12AX4GT / 12AX4GTA / 12AX4GTB tubes tested to spec on our Paul Hart-calibrated TV7/U

General Electric GE 5Y3 5Y3GT Vacuum Tube Rectifier Black Plate 115N01OT These US-made 12SF7 tubes wereThis black plate GE MANUFACTURED, Admiral BRANDED 5Y3GT rectifier tube was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. It measured 52 57 where minimum (65%) is 40 40 and 100% is 62 62. It has a top, D getter, excellent flashing and 58 13 188 5 date factory codes. WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE IT. PLEASE ALSO SEE OUT ETSY SISTER SITE