Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass Silvertone Gebraucht This CBS-Hytron 117Z3 tube tested

This CBS-Hytron 117Z3 tube tested to spec on our Paul Hart-calibrated TV7/U

Tube One Transconductance: 45/45

new in box RCA number / type #38 tube tested to spec on our Paul Hart-calibrated TV7/U

This matched trio of RCA 5Z4 rectifier tubes were tested on our Paul Hart-calibrated TV7/U for shorts

art nouveau look

Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass Silvertone Gebraucht This CBS-Hytron 117Z3 tube testedThis matched pair of GE 6K6 6K6GT tubes was tested on our Maxi Matcher 2 with 325 volts on the plates and a bias of 36 volts for shorts, gas, plate current and transconductance. There were no shorts or gas. Tube One measured 1200 micromhos, 18. 6 milliamps' plate current. Tube Two measured 1510 18. 7. New nominal is within one standard deviation of 1900. These tubes have copper support rods; rectangular mica spacers; black and silver bottles and 3 52