Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass 6K6GT OG They have 7-09 188-5 and

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

Date Codes: 1-43 and NK

IN NEARLY 9000 SALES

I have played them in my Radio Craftsmen RC-2 monoblocks and they sound great

Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass 6K6GT OG They have 7-09 188-5 andThis 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