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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Unijunction Triac Control (CB25861E)
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This circuit was obtained in a 80s RCA documentation. The circuit uses components from that time....
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This circuit compares the input voltages by providing an output according to the curve next to the...