Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass NOS-Testing CAL 403 Etsy will indicate how many

Etsy will indicate how many are available as the listing progresses

The spine is in fine shape with no loose pages and the dust jacket is without nicks or tears

Both are acid-etched

This lot of seven GE new old stock

Matched Pair General Electric GE 6K6 6K6GT Vacuum Tubes Black Glass NOS-Testing CAL 403 Etsy will indicate how manyThis matched pair of GE MANUFACTURED 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 1940 micromhos, 29. 3 milliamps' plate current. Tube Two measured 1880 31. 8. New nominal is within one standard deviation of 1900. These tubes have copper support rods; rectangular mica spacers; black and silver