Signal Tracer and Capacitor Tester (T1241E)

This mains powered two-in-one instrument was found in a Radio Craft from March 1948. The headphone must be high impedance.

Series Regulator SFC2309R (CB19500E)
The integrated circuit used in this regulator is not common today. The circuit is from a technical...
Roulette and Electronic Dice (CB3830E)
This circuit of an old documentation but with modern components still common today, brings...
15 W Amplifier (CB16380E)
This amplifier, found in a 1981 publication, provides 15 W lHF power with a supply voltage of 14.4...