This type of configuration, which appears elsewhere in this section, was found in a 1965 publication by General Electric. The circuit is half-wave and can be built with equivalent SCRs.
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...