6 V power supply with power zener (CB21531E)

This circuit provides 6.3V of output from a 9V input. The circuit was found in a Dutch publication from 1966.

Ultra precision voltage to frequency converter (CB20835E)
We found this circuit in an old American documentation. Accuracy has 0.02% error and 0.003%...
Video Distribution Amplifier (CB26050E)
We found this video amplifier with integrated circuits of the time in the magazine Electronics Now of July...
AC126 amplifier stage (CB4265E)
This is an amplifier stage with a typical germanium transistor from the 60's to the 70's. The...