1940s commercial receiver (T1618E)

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

35 W Amplifier (CB6299E)
With only 1% distortion, this Motorola amplifier found in a 1968 documentation makes use of period...
Bipolar Current Source (CB19946E)
This circuit generates a constant current limited by the characteristics of the operational...
CMOS Oscillator with Active Cycle Adjustment (CB11333E)
With this circuit it is possible to adjust the active cycle of the generated signal in a wide...