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...
A celebration of the addition of an LRS Relay and ita AEG amplifier to the museum of the University of Electro_Communications in Chofu City, Tokyo. The celebrents are, left to right, Hisashi Ohtsuka (who assembled the collection), Prof. Yukawa (museum curator, Bengt Svensson (who played a mojor role in having the LRS transferred from the...
Two versions of the Eital-McCullough 4W20,000A power tetrode: at left., an early version (1952), cut open to reveal the “bombardment” cathode; at right, one from 1955. This tube is documented extensively in TC for oct. 2010. A very early bulbedd model, possibly the X486 protype, is illustrated on Norm Wilson’s n6jv.com web site. In...
A group of Eitel-McCullough stacked-ceramic receiving tubes from the “CD” project of the mid-50’s. Details in the article inside. In this issue
On the Cover Ross Smith’s display of two-digit tubes in the Equipment Contest at Rochester. See p.2 for details. In this issue
A classically styled promotion poster for the Italian tube maker Zenith, with Factory located in Monza. Beginning about 1929, it made a line of European and American- designed receiving tubes. The original art is 10″ by 15-1/2″. It has been reproduced as a lithograph on steel and in a book on old-time posters. In...
A set of classic tube-test labels. See the editorial pages for more details. In this issue