Photo relay with thyratron (T1700E)

We found this circuit isolated from the power grid in a Radio Electronics from September 1958. The circuit uses a crystal cell, type LDR at the time.

5 and 15 V Dual Symmetric Power Supply (CB4304E)
This symmetrical power source for currents up to 1 A was found in a 1986 documentation, serving...
Varicap Variable Frequency Oscillator (CB4587E)
The great advantage of the circuit shown in the figure is that its frequency is controlled by a...
Capacitive Discharge Ignition (CB6382E)
This circuit from General Electric was found in a 1967 documentation. The SCR is of the time, as...