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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Sinusoidal generator CA3130 (CB21988E)
This interesting op-amp signal generator circuit was found in a 1977 documentation. The circuit has...
Two Transistors Amplifier Stage (CB14026E)
This circuit is from an English technical documentation and can be implemented with BC558...
Instrument sensitivity multiplier (CB21668E)
We found this circuit for increasing the sensitivity of an instrument in a 1960 documentation. The transistors...