Pocket Tube Radio (T1621E)

This sensitive 4-tube, battery-powered receiver was found in a 1949 Radio Electronics. The circuitry was wired in crystal earphones.

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Slow Turn On Power Supply For Amplifiers (CIR815E)
This circuit is used to cut the “click” in the loudspeaker of amplifiers when they are turned on....
Crystal calibrator (CB6900E)
This circuit for several frequencies was obtained in an American documentation from the 90s. The...
Audio Output Stage (CB466)
This simple circuit can be used as audio output stage for intercoms, experimental radios and other low...