Neon flip flop with reset (T1724E)

This circuit with two neon lamps was found in Radio Electronics magazine from November 1959. Note the supply voltage and waveforms.

Undervoltage and overvoltage indicator (CB5073E)
This circuit that uses only transistors indicates when the voltage in the circuit has the voltage...
Audio stage for radio with LM386 (CB25295E)
This circuit serves as an audio output for AM or even FM radios and was found in a Radio...
Simple 555 Timer (CB3982E)
This configuration is suggested by Mullard (Philips) in an old manual of 555 integrated circuits....