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Volume14, Number 4
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Vol. 14, No. 4

“Cut-away view of a special-quality double triode wth frame-grid construction (E88CC)”, from a Philips promotion for premium “10,000-hour” tubes. The US version is the 6922, a cousin of the 6DJ8 TV-tuner tube now highly respected as an audio type.   In this issue

Volume17, Number 2
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Vol. 17, No. 2

In honor of the coverage of cavity-magnetron history in this issue, here ia a classic: the 4J50. This device, with its built-in magnet, was designed by Bell Labs for manufacture by Western Electric during WWII, but successful enough to be offered by at least eight other makers in the US, Britian, the Netherlands, France and...

Volume12, Number 1
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Vol. 12, No. 1

An RCA promo item from 1929 from their dealer publication “Good News” plugging the sales of replacement tubes.   In this issue  

Volume14, Number 5
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Vol. 14, No. 5

Joe Knight showing Jim McConville his official replica of the Lieban-Reiss-Strauss (LRS) Relay, made by Siemans & Haiske, at the TCA meeting in October, The carton is emblazoned with warnings like “Achtung! Vorsichtig Behandeln. Attention! Manier avec soin”   In this issue

Volume17, Number 3
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Vol. 17, No. 3

“First siliicon in Silicon Valley”. A PNPN diode, 1958 production from the ill-fated Schockley Transistor Coroporation, working merrily in a simple relazation oscilator. The diode is the tubular gold-colored device in the clips at lower left. The pulse rate shown is 800Hz, but the falltime is so crisp as to put a vigorous whine into...