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By the U.S. Navy (1951), edited by Trinkaus. First came the vacuum tube, then the transistor, right? Not really. In between there is another lost entity. Electronics engineers of the 1950's believed the rugged little magnetic amplifier was going to replace the fragile vacuum tube in all its functions under abasic mag amp megacycle. Originating in the USA but adopted and developed by the Nazis for the V2 missile, the mag amp after WWII found a clique of boosters among US electronics engineers. This document, unusually passionate and well written for a military tech manual, is their promotional brochure. Evident today only in some motor-control and power-supply regulator applications, the mag amp not only can regulate but can magnify, modulate, switch, pulse-generate, invert, convert, multivibrate, phase shift, and multiply. Mag amps require zero maintenance, can be made indestructible and EMP-proof, and can handle up to 200,000 amperes. Modulate your Tesla coil with a mag amp. This booklet has been completely reset and redesigned for economy and readability. Also see: Magnetic Amplifiers Bibliography. 43 illustrations.