Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Valves Copper Support Rods NOS-Testing JAN-CTL-6AR6 6098 This is an original recording

This is an original recording from 1939 and it sounds 15-20 years ahead of its time

Transconductance measured 58 for Tube One and 59 for Tube Two where minimum (65%) is 40

CUSTOMS DELAYS CAN ADD WEEKS TO DELIVERIES

new in box GE 6GC5 tubes tested to spec on our Paul Hart-calibrated TV-7/U

Matched Pair General Electric GE 12SN7 12SN7GT Vacuum Tubes Valves Copper Support Rods NOS-Testing JAN-CTL-6AR6 6098 This is an original recordingThis new old stock testing matched pair of GE 12SN7GT dual triodes was tested on our Paul Hart calibrated TV7 U for shorts, gas and transconductance. There were no shorts or gas. Transconductance measured 81 82 for Tube One and 84 83 for Tube Two where minimum (65%) is 50 50 and 100% is 77 77. They have copper support rods; 4 17 188 5 and 2 48 188 5 date provenance codes, respectively; side, horseshoe getters and excellent flashing. As I write, I am