5-tube 3W Amplifier (T478E)

This circuit was obtained from a 1947 amplifier manual. The circuit makes use of a transformer source, but it can also be battery powered.

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Breathalyzer (CB25160E)
This circuit was published in an article in Radio Electronics magazine in October 1988. It uses...
One Transistor Mixer Preamplifier (CB871E)
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Crystal Controlled Signal Source (CB6147E)
This circuit was obtained from a 1980's QST magazine. The circuit can generate 1 to 15 MHz signals...