Category: Volume 6

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Volume 6, Number 4

Vol. 6, No. 4

On the Cover The Eimac X272 developmental tetrode from 1944 – a 4-125A with three radial pins added to reduce lead inductance. In this issue

Volume 6, Number 5

Vol. 6, No. 5

On the Cover This appears to be British Post Office “Valve Amplifing No. 1,” made by BTH, as discussed in Keith Thrower’s British Radio Valves – The Vintage Years; 1904-1925. The photo is of a sample in the long-abolished tube museum at Bell Laboratories. Photo: Bell Labs, courtesy of Jerry Vanicek. In this issue

Volume 6, Number 6

Vol. 6, No. 6

On the Cover One version of the George Clark receiving tube, Fig. 1 of Bill Condon’s article that starts on Page 2. In this issue

Volume 6, Number 2

Vol. 6, No. 2

On the Cover An early, labeled version of the Westinghouse WD-11. See Bill Condon’s article on p.2. In this issue