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July, 1944 , MILITARY AMPLIFIER DESIGN 13
point-to-point wiring construction of so many commercial amplifiers is distinctly passt. A layer-built amplifier may represent a lower initial investment than an amplifier properly designed for ease of service and replacement, but the final cost of such designs to the military services is prohibitive. It is not considered good design practice in military equipment to save the last Vs in. of hookup wire and lower the price when servicing of equipment is impaired. Equipment that cannot be serviced easily soon ends on the junk pile.
Fig. 2 shows an underchassis view of a radio receiver which illustrates good design as practiced today for the military and for the de
Bendix Radio Photo
FIG. 2. Cleancut, easily serviceable design in electronic equipment, such as is shown here, is desired by the Armed Forces.
manding commercial customer. This particular photograph is one of a commercial prototype of an equipment which, relatively unchanged, has been furnished to the military services in large numbers.
Compare this equipment with the ordinary 16-mm projection amplifier, layer built and crammed to save the last possible inch of space. Note how the capacitors and resistors are mounted on terminal boards with very short leads so that they will withstand vibration. Note also how the terminal boards are mounted so that if any resistor or capacitor fails, it may be quickly and easily replaced, since the strips may be quickly unscrewed and turned flat for ease of servicing.
Note how the use of shielding wire has been avoided through use of