Click on the pictures above for a larger view. These exceptionally beautiful UV Le Radion and Le Clairton vacuum tubes, made in the 1923 time- line, imply they were made by a French maker, but were they? It seems not. A contemporary shipping box for the Le Radion brand indicates they could have been made...
Pacific Radio News magazines were first published in January, 1917 by the San Francisco Radio Club with H. W. Dickow as editor, P. R Fenner as manager, L. O Fassett as assistant manager, and D. B. Mcgown as assistant editor, It was a monthly magazine featuring up-to-date radio communication news from around the country, and...
Very little is known about the W. E. VT-15 save for these facts: It is rare. Perhaps only 4 or 5 known. It has the same specs as the Western Electric 215-A but with a “Duck Foot” splayed base pin configuration for possible use by the US Navy. Specs of the W.E. 215 A here:...
Figs.1, and 2 show the CF 185 detector tube with the US Navy 3- point base. The side pin and one of the bottom pins are the filament connections. These were made by DeForest for Navy use starting in Nov., 1916 as can be seen in the document on the left below. Etched on the...
Sonatron made very interesting and at this date, somewhat rare amplifier units with red, white, and blue colored tubes that made for a outstanding marketing scheme. The buyer could choose what their MU tubes to be included with his purchase according to what was needed, higher volume, tone quality, high amplification, etc. It is also...
George Westinghouse, (1846-1914), industrialist extraordinaire, had the business acumen to start many business ventures that changed people’s lives. In 1884 he formed the Westinghouse Electric and Manufacturing Company, later to be known as the Westinghouse Electric Company. This article will concentrate on the vacuum tube division of W. E. & M and its subsidiary, Westinghouse...
Contrary to popular belief, Robert Von Lieben, was the first to design and patent a triode amplifier valve. His triode amplifier patent, numbered 179,807, was published on Nov., 18th, 1906 in Germany. By contrast, DeForest had a working audion triode in his lab on Dec., 30th, 1906. He filed for a patent on Jan., 29th,...
This author has scanned all the magazines that appear on this website and many had very interesting articles like this one that Fin Stewart submitted in Vol. 14, No 2, April, 2012. Fin Stewart quote: “I picked up a mint copy of the book: BTH, Reminiscences – Sixty Years of Progress published in 1946, and...
John Fleming, working for the Marconi Wireless Telegraph Co. in London and was the first to experiment with the Edison Effect light bulb. Some of the 2nd generation Fleming valves were tubular and were mounted in what became known as the “Gallows Type”. Third and fourth generation Fleming valves took on the shape of English...