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SOME FUNDAMENTAL CONSIDERATIONS IN MILITARY AMPLIFIER DESIGN*
S. L. CHERTOK**
The design of amplifier equipment for military use differs considerably from the design of amplifiers for the commercial market, both in the physical details of construction and in the quality of parts which must be used for trouble-free operation in the field.
The designer of military amplifiers must always keep in mind the extreme conditions of vibration, shock, high humidity, extreme lowand high-ambient storage and operating temperatures, and of saltand dust-laden atmospheres to which the amplifiers may be exposed. Designing an amplifier which will stand up under these conditions is obviously not the simple job of catalogue assembly which typifies the design of ordinary commercial equipment, which need withstand only relatively "kid-glove" usage, in temperate climates.
Further, the amplifier designer must keep in mind that the using personnel may not always be carefully trained sound men. Consequently, equipment must be as simple and foolproof to operate as possible, so that the most untrained "GI" can use it if necessary. Also, the designer must always remember that eventually the equipment will need repair. He must make provision for quick and easy replacement of parts with other standard parts. There is not a service man around the corner nor is there a parts' jobber 2 miles down the street out in the South Pacific jungles.
One thing the equipment designer can forget is eye appeal. Commercial streamlining and fancy chrome trim need not be allowed to compromise a good electrical design, and functional placement of controls. Plain "o.d." or Navy gray is the height of fashion. Symmetrical placement of controls is frowned upon. Operators will make mistakes under pressure in the dark. Experience has shown that asymmetrically located controls will prevent many faux pas in operation. Likewise, controls must be far enough apart and large
* Presented Apr. 19, 1944, at the Technical Conference in New York. ** American Standards Association, New York.
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