Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament NOS NIB Records HS 11147 new in box Shield 6AS5

new in box Shield 6AS5 tube tested to spec on our Paul Hart-calibrated TV7/U

new in box RCA 13GF7 13GF7A tubes tested to spec on our Paul Hart-calibrated TV7/U

5-9 out of ten

Sylvania-LABELED 11BM8 tested to spec on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 6SN7 6SN7GTB Vacuum Tubes Copper Support Rods Top Filament NOS NIB Records HS 11147 new in box Shield 6AS5This new old stock, new in box matched pair of GE MANUFACTURED 6SN7GTB dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas and transconductance measured as follows: Tube One: 79 72 (GE MANUFACTURED, Amperex LABELED) Tube Two: 82 76 Bogey: Minimum (65%) is 50 50; 100% is 77 77 Physical Characteristics: Bases: tall Bottles: medium height Date Codes: none and MY, respectively EIA