An Eimac 8351/4CV100,000 vapor-cooled tetrode, of the type used in one of the Collins 250-kW transmitters, now removed, at the Voice of America transmitting site outside Delano, California. It is accompanied by its much smaller vcousin, a mere 4-1000. In this issue
Part of a fine collection of developmental metal tubes. See inside for more details Photos: Bob Millard. In this issue
Soviet-era transmitter technician tests at the fuse panel. From Radio magazine, March 1954 In this issue
A family of Philips Innoval tubes – left to right, 6BH5, 6M5, 12AN7, 6N8, and 6AN7. Photo: Daniel Stocks. In this issue
Hisashi Ohtsuka inspecting an LRS Realy at the Technical Museum in Stockholm. The tube, and a Telefunken amplifier that uses it, are being loaned to the museum of the University of Electro-Communication in Tokyo. This greatly enhances the excellent tube collection that Ohtsuka donated, and that he continued to support. (See TCA, April 2005, p....
The Philips EC157 microwave triode, registered in 1963 with the Electronic Industries Association (but not cataloged) by Philips’ subsidiary Amperex. While physically similar to the much earlier “lighthouse” tubes (2C43 etc.) from General Electric, this one is substantially redesigned and is rated at much higher frequency (6GHz). In this issue
The front cover of an RCA service-dealer magazine from the mid-Twenties, featuring the “Selling Fool” doll. Graphic: Joe Knight In this issue
The RCA “Sellin Fool” mannikin of 1931-32 returns, this time endorsing TCA. In this issue