3-channel preamp (T484E)

This 4-tube circuit was found in an American publication from 1947. It is intended for audio distribution lines using a transformer source.

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Low Distortion Oscillator (CB14622E)
With the components indicated, the circuit oscillates at 20 MHz. The coils and capacitors can be...
High Input Resistance Amplifier (CB19902E)
We found this preamplifier circuit with high input resistance, on the order of 30 M ohms, in an...
Symmetrical Adjustable Source (CB16785E)
This symmetrical 1.2 to 35 V source was found in a 1994 documentation. The integrated circuits are...