Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass Silvertone Gebraucht These four Sylvania-MANUFACTURED 6U7G tubes

These four Sylvania-MANUFACTURED 6U7G tubes were tested on our Paul Hart-calibrated TV7/U for shorts

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

new in box GE 6AU5GTs

art nouveau look

They tested (from left to right) as follows: 38

Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass Silvertone Gebraucht These four Sylvania-MANUFACTURED 6U7G tubesThis 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