This is an old test circuit for integrated TTL counters, feeding a Nixie tube, common at the time. The circuit is from the 90's, not being given the power supply.
This flasher with two power transistors was found in a Radio Electronics magazine from September 1961....
The configuration already explored in our Circuit Bench section is from the National...
We found this circuit in a Popular Electronics from the 90's. The circuit activates an oscillator...