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A Technique for Displaying the Current and Voltage Output Capability of Amplifiers and Relating This to the Demands of Loudspeakers

The amplifier under test is fed with a large low-frequency sine-wave input on which 50us pulses of alternate polarity are superimposed. These pulses drive the amplifier's protection circuits into current-limiting, and the set-up gives a CRT presentation having current-limit values vertically and instantaneous output voltage horizontally. The displays obtained, which sometimes disclose unsuspected amplifier design faults, are compared with those derived in tests made on loudspeakers using programme and other inputs.

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