Found in a 90s Electronic Design, this circuit produces adjustable pulses that start after an adjustable interval. The circuit can be implemented with modern equivalent components.
This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time....
This old oscillator using germanium transistors has a high impedance headphone as inductor to...
This preamp with several inputs using germanium transistors from the time was found in Japanese...