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Re: I suspect.........

Dumb guess, Dan. If you had the schematics you would see that the oscillator and its output driver are completely resistively buffered from the cable itself. Also I deliberately put a relatively large capacitor (.033uf) to ground designed to attenuate anything over 5KHz on the oscillator and therefore improve both the S/N of the oscillator and its residual distortion, as well as to have a predictable cap load buffering any changes in cable capacitance. The distorion itself still looks and measures like mini back paralled diodes in series with the wire. It is most probably PIM distortion in the return shield interface with the rca connectors. This could probably have been ignored by the Audio Precision, but important with the ST. I also wish to say that the examples provided to me were very well soldered, when they were custom made, and in general measured better than other examples on my workbench.

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