Category: Blog

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...

DeForest Audion with a normal looking Box

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...

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 2 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, and...

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...

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...

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...