Several models of high power audio amplifiers have been developed and constructed, capable of 45 watts output. These amplifiers utilize a ribbed chassis for cooling and are stable up to an ambient temperature of 50 degrees C. One amplifier uses a series type circuit, and the other a quasi-complementary type circuit. Amplifier size and weight are reduced since neither circuit employs driver or output transformers These circuits will be described and performance data for amplifiers will be presented.
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