The Accurate Testing of Audio Amplifiers in Production

The necessity for a means to obtain a quantitative check on radio receivers, as they are produced in considerable quantities, is becoming more and more apparent. This paper deals with a method for quickly comparing the voice frequency amplifying system of receivers, particularly those for use in broadcast reception, with a predetermined standard. The test is made on the two most important characteristics of the performance of an audio amplifier, namely the amplification within the band of audio frequencies, and the undistorted power output that it will deliver.