Amplifier stage (CB21940E)

This circuit with germanium transistors was found in a publication by Gernsback from 1960. The circuit is low power, a few tens of milliwatts.

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Touch or leak alarm (CB22092E)
This circuit was found in old documentation. The SCR can be any of the 106 family. Note the sensor...
Staircase generator (CB21847E)
This circuit was found in Ferranti's 1974 transistor manual. The transistors are from the period and...
Transistor relaxation oscillator (CB12680E)
Short duration pulses can be obtained with the relaxation oscillator that uses common transistors and is...