Category: Magazines

On the Cover The 15D prototype UHF triode. In this issue

Massive “Club 30” TV receiver “designed for use in public places, such as schools, clubs, hospitals, and resturants” (gin mills not mentioned) using the big new 308P4 picture tube. Adapted from the July 1950 issue of the Du Mont Raster. Photo: Wm. Wade, Jr.   In this issue

A family of early-’20s Magnavox triodes, as covered, along with the newly revealed “Kathion” rectifier, in the lead article.   In this issue

On the Cover Japanese U233 radar transmitting triode from WW 11. In this issue

Oldie transmitter assembled by Andrew Burge, G6ALB using the massive GM100 tube. It has the rig of “using a platoon of Marines to do a boy’s job” but who’s counting? Other construction projects are documenting on WWW.tetrode.co.uk. Image copyright @2011 Andrew J. Burge, used by permission.   In this issue

Well known colllecytor Udo Radtke with a Brown Boveri BTW150-2 power triode. The little package carries a dissapation rating of 220kW. Technical data and more photos are available at http://www.tubecollection.de/types/BTW150-2.htm. Note the spiral oxidation pattern on the anode, presumably the result of a cooler designed to give a helical flow of the cooling water.  ...

On the Cover “Early DeForest Audion”. In this issue

“Dan’s Used Curve-Tracer Lot” -Daniel Schoo, perhaps better known for herioc radio restorations in the pages of Antique Radio Classified, now appears in our pages with a feature on adapting tracers intended for solid-state devices to use with tubes. Photo: Daniel Schoo.   In this issue

Inside a Western Electric ES-9709B oak-cabinet repeater “gain Element” of the type used at Brushton outside Pittsburgh on the 1914 transcontinental line. (For a front view, see inside this issue, or p. 93 of Tyne’s Saga of the Vacuum Tube.) The pair of Everready multicell dry batteries labeled “C Battery” may reflect the first commercial...

On the Cover An oridinary Type 76. In this issue