Complex reflex receiver (T1663E)

Found in documentation from 1924, this 4-tube circuit has a heterodyne amplifier, as it was called.

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Fluorescent Dimmer (CB1310E)
In the figure we have a circuit of a dimmer for fluorescent lamps. The circuit is from...
Emitter Follower (CB6155E)
This circuit was found in a 1967 US documentation. The circuit applies to modern general purpose...
Square Signals 555 Astable (CB1296E)
This configuration is traditional and can be found in many other circuits in this section. The...