Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass NOS-Testing Majel Barrett They have 0-09 188-5 and

They have 0-09 188-5 and 9-04 188-5 date / provenance codes

Two have MISSING CENTERING PINS

This new old stock-testing matched pair of National Union-MANUFATURED Type 37 triodes was tested on our Paul Hart-calibrated TV7 For shorts

Tube One measured 1940 micromhos

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Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass NOS-Testing Majel Barrett They have 0-09 188-5 andThis new old stock TESTING 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 2200 micromhos, 34. 5 milliamps' plate current. Tube Two measured 2040 36. 1. New nominal is within one standard deviation of 1900. These tubes have copper support rods; rectangular mica spacers; black and