This circuit was found in a 1967 documentation. It is intended for triggering a xenon LASER. Observe the high operating voltages of the circuit. The components used are uncommon today.
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...