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.

10W Transistor Amplifier (CB1319E)
In this amplifier, the supply voltage is 35 V and the input resistance is 2k2. Equivalent...
Laser Diode Driver (CB5183E)
This high speed laser diode driver was found in a 1980s documentation. Power FETs can be replaced...
Differential instrumentation amplifier (CB9841E)
This instrumentation amplifier with differential inputs was found in documentation from the 90s....