Amplifier with 4 transistors. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Transistor power amplifiers
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In this diagram, there is an interesting symbiosis of germanium transistors with a field effect transistor.
The sound quality, despite the more than modest characteristics, is very good. In order to refresh the impressions of a quarter of a century ago, I was not too lazy to assemble the design on a mock-up, slightly modernizing it to match the modern denominations of parts. The MP37 transistor can be replaced with a silicon KT315, since when setting up, you still have to select the resistance of the resistor R1.
When working with a load of 8 ohms, the power will increase to about 3,5 W, the capacitance of the capacitor C3 will have to be increased to 1000 microfarads. And to work with a load of 4 ohms, you will have to reduce the supply voltage to 15 volts so as not to exceed the maximum power dissipation of the output stage transistors. Since there is no overall DC CNF, thermal stability is only sufficient for home use.
Author: A. Shikhatov; Publication: bluesmobile.com/shikhman
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