XTAL oscillator with fine tuning (CB22403E)

We found this circuit in an old English documentation. The integrated circuit is of a specific type of the time.

Bicycle Signaler (CB6758E)
This configuration similar to many of this site was found in 1965 General Electric documentation. Modern...
Fence Electrifier (CB11372E)
This circuit is from an American manual from 1974. It uses a diac (Q1) and the SCR can be the...
Crystal dipper and oscillator (CB23926E)
This circuit works both as a grid-dip (transistorized) and as an oscillator. The circuit is from a...