OTL transistor radio in a power amplifier circuit

  
Transistor radio shows common OTL power amplifier circuit, VT5 bias resistor driver stage. VT6 and VT7 is a pair of complementary symmetry tube. VT6 germanium material NPN transistor, VT7 is germanium PNP transistor. VT6, VT7 and the biasing resistor
OTL transistor radio in a power amplifier circuit - schematic

composition typical OTL amplifier. To illustrate the process of the circuit, circle omitted satin bias resistor and incentives.



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