This is one of the channels of an amplifier suggested by Westinghouse in 1970s documentation. The circuit uses components from the era and no information about the transformer is given.
e find this circuit in documentation for radio amateurs of 1974. The unijunction transistor can be...
Circuits similar to this can be found in this section. This is from 1967 General Electric...
This circuit can be made usng the TIP32 transistor but must use carbon microphone (not very common these...