1940s commercial receiver (T1618E)

This receiver was found in a Radio Electronics from 1949. It is a superheterodyne of the time using 6 tubes.

741 Audio Amplifier with Single Source (CB25289E)
This circuit of a few tens of milliwatts of power requires a single source. We found it in a Radio...
Flip Flop with SCR (CB4612E)
This circuit has two stable states such that at each instant only one SCR leads. The state change is...
1 to 1 Astable Using the 555 (CB863E)
An stable multivibrator with 50% of duty cucle can be mounted using the 555 as shown by the...