1940s commercial receiver (T1618E)

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

Delay Circuit (CB10930E)
This circuit was obtained in a 1991 Electronics Handbook. The publication no longer exists, but...
Timed Relay (CB21866E)
We found this circuit in Ferranti's 1974 transistor manual. The components are from the period. Note...
Instrumentation Amplifier (CB12173E)
This instrumentation amplifier was obtained from Popular Electronics in 1993. The operational...