Found in a 1967 General Electric documentation, this meter uses Nixie tubes, popular at a time when LED and liquid crystal displays did not yet exist.
This fuzz distortion circuit was found in old RCA documentation. Equivalent transistors may be...
This circuit with transistors of the time was found in the magazine Radio Electroinics of June of...
Several versions of this circuit can be found on this website. This makes use of FETs that can...