Category: Volume 18

On the Cover Amperex cover sheet featuring the 8505. In this issue

On the Cover The well reputed EL84/6BQ5 output tube. In this issue

On the Cover An ad for the British “Catkin” receiving tube. The name is a diminutive form derived from CAT (“Copper Anode Triode”). In this issue Vacuum Tubes Used in the First Trans-Atlantic Flight High-Voltage Processing of Big PowerTubes The Eimac View: Conditioning of Large Radio-Frequency Power Tubes Internal Control Symbols for RCA Tubes RCA...

On the Cover Part of a collection of WWII tubes at the Evans Signal Laboratory, a unit of the Signal Corps Engineering Laboratory in New Jersey. In this issue

On the Cover Cover of a 1932 booklet from the Arcturus Radio Tube Company. In this issue

On the Cover Old-time “image” advertisement for Mullard tubes. In this issue