Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass 6K6GT OG This matched pair of Sylvania

This matched pair of Sylvania Type 27 triodes was tested on our Paul Hart-calibrated TV7/U for shorts

Date Codes: 1-43 and NK

They have 7-09 188-5 and 630 188-5 date/provenance codes

These seven Philco number / type 27 tubes tested as good on our Paul Hart-calibrated TV7/U

Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass 6K6GT OG This matched pair of SylvaniaThis 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 1630 micromhos, 23. 6 milliamps' plate current. Tube Two measured 1490 23. 88. 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