6SN7 Preamplifier (T1105E)

This preamp circuit has a typical configuration as found in a 1946 publication. Supply voltages are indicated.

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...