We found this ladder-shaped signal generator circuit in Radio Electronics magazine from August 1966. The circuit uses a unijunction transistor as its base.
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...