3-tube receiver (T1602E)

Found in a 1949 Radio Electronics, this circuit employs vacuum tubes of the time. Power supply not provided.

Balanced modulator (CB7927E)
We found this circuit in a 1968 Hughes publication. The components are from the era and can be...
Current Transmitter for Thermocouple LM10 (CB14313E)
The circuit presented is from the Linear Applications Handbook of the National Semiconductor of...
Electronic Multimeter (CB16570E)
We found this electronic analog multimeter in a 1998 documentation. What sets it apart from...