The unit has a separate amplifier and oscillator section allowing them to be used separately if need be. The injector is a multivibrator running at 1 kHz, with R5 andR6 dividing down the output to a suitable level («1V). The tracer is a single-stage amplifier that drives the high impedance earpiece
Injector-tracer - schematic

C4 decouples the input.

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