Coronado / Ken-Rad 6K6 6K6G Vacuum Tube Black And Silver Glass Shoulder ST-Shape NOS-Testing Plate Cap T27 They are exactly-the-same on the

They are exactly-the-same on the inside with the exception of the top mica spacers

These four Super Silvertone 12A8GT tubes were tested for shorts

Two are GE and two are Sylvania

This hard cover book is in good condition

It has a dimpled sheet getter

Coronado / Ken-Rad 6K6 6K6G Vacuum Tube Black And Silver Glass Shoulder ST-Shape NOS-Testing Plate Cap T27 They are exactly-the-same on theThis new old stock testing Coronado BRANDED, Ken Rad MANUFACTURED 6K6 6K6G tube was tested on our Maxi Matcher II with 325 volts on the plates and a bias of 36 volts for shorts, gas and transconductance. There were no shorts or gas and it measured 2110 micromhos and drew 27. 1 milliamps' plate current. (New nominal transconductance is within one standard deviation of 1900.) WE HAVE SCORES OF THOUSANDS OF VACUUM TUBES. IF IT'S NOT LISTED, WE MAY HAVE