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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...

Vacuum Tubes That Went to Court
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Vacuum Tubes That Went to Court

This is a copy, with a few updates, that this author uploaded to groups.io on 2/2/2021. Hope it has some interest? This author, 15 years ago, attended an auction in New York City. While no old radios or vacuum tubes were mentioned, 1 lot did have several items that I had to purchase. The items...

D-Lux Blue Vacuum Tubes
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D-Lux Blue Vacuum Tubes

Very little information is available on the D-Lux Blue brand of tubes shown above. Serlin & Company, 129 Michigan Ave., Detroit, Michigan sold these UV-201-A tubes for just a few months in 1925 in the Detroit Free Press newspaper. They resemble the Brightson True Blue brand very closely in diameter of glass bulb, blue color,...

Moorhead Companies Tube Contributions: 1915-1925
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Moorhead Companies Tube Contributions: 1915-1925

While this article is a re-do of a previous work, it has never appeared in either the old TCA magazine or on this website. It is not the complete line Otis Moorhead offered, but it represents a good deal of his product line. All tubes reside in the Joe Gruber collection. Click on the pictures...

DeForest Notes
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DeForest Notes

June, 1912 – February, 1914 These documents appeared in Vol., 19, #2, April 2017 of the TCA magazine. Forward was written by Ludwell Sibley shown below. There are too many pages to present here in any other form other than a hyperlink here: DFN In the same group of scans I did at Jerry Vanicek’s...

John Hays Hammond Jr. Torpedo Relay Tube
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John Hays Hammond Jr. Torpedo Relay Tube

Forward This article first appeared in the TCA magazine numbered Vol. 18, No. 2, April, 2016. Since that writing, I have, mostly by accident, found much more information on Hammond and will be expanding the original. First, I will copy the article as it appeared and after I will add the additional newly found facts...

Equipment Used in the First Trans-Atlantic Flight: Part 2
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Equipment Used in the First Trans-Atlantic Flight: Part 2

Identification of the Radio Equipment used on the NC-4 The initial article in the May 2016 TCA magazine on the flight of the NC-4 contained this picture, fig.1, of the radio equipment that held the vacuum tubes that made the first trans-Atlantic crossing possible. This author felt compelled to identify the devices used. They are...

Vacuum Tubes Used in the First Trans-Atlantic Flight: Part 1
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Vacuum Tubes Used in the First Trans-Atlantic Flight: Part 1

The first trans-Atlantic flight by the US Navy is an often-overlooked event in aviation history along with the most important part of the communication equipment necessary to complete that task- the vacuum tube. By orders from the Assistant Secretary of the US Navy, Franklin D. Roosevelt, plans for large, long-range flying boats were drawn as...