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Observations of the Western Electric VT-15, 1920
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Observations of the Western Electric VT-15, 1920

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:...

A Few Notes on the DeForest CF 185
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A Few Notes on the DeForest CF 185

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 3 Tube Amplifier
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Sonatron 3 Tube Amplifier

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...

W. E. & M’s UV 201 Vacuum Tube
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W. E. & M’s UV 201 Vacuum Tube

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...

Robert Von Lieben and the LRS Relay
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Robert Von Lieben and the LRS Relay

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,...

An Audion by British Thomson-Houston?
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An Audion by British Thomson-Houston?

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...

Diodes From the Twenties
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Diodes From the Twenties

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...