Transition from tube rectifier to semiconductor (T1120E)

In both diagrams we have a source with tubes and the diode equivalent that was appearing at that time. The article is a Radio Craft from 1947.

Reservoir Level Control (CB6570E)
This circuit was found in a 1966 General Electric documentation. It makes use of direct contact...
LED Test Circuit Using the Oscilloscope (MSB079E)
LEDs are diodes and can be tested with a simple configuration that allows the display of its...
Sequential Upand Down (CB4579E)
This circuit uses components that are still common despite being from 1995 documentation. The circuit can...