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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One Transistor Preamplifier (CB921E)
This old configuration using a germanium transistor was designed to operate with variable...
Bootstrapped Emitter Follower Stage (CB25619E)
This circuit with low impedance output and 900k input impedance was found in the October 1993...
12 V x 1 A Power Supply (CB1172E)
This power supply provides a12 V stabilized output. The transistor must be provided with a good...