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In Reply to: RE: Mac C11/C22 owners..A question? posted by Michael Samra on July 01, 2009 at 13:21:14
Hi, Mike and others:
I have owned many examples of the C-22. In some of these, I replaced all of the small coupling caps and the smaller electrolytics, etc.
As you may know, both in the C-11 and the C-22, McIntosh chose to incorporate molded circuit modules (thin wafer-like units with multiple pins). I was told by the factory reps at local, dealer-sponsored "Performance Clinics" that these modules were responsible for higher than normal amounts of harmonic distortion components showing up upon test (in the phono mode). In the late seventies, Mac ran out of replacements for these wafers and recommended that their little circuits should be replaced with perfboarded replicas if proper phono and tone control service was to be maintained.
Which sort of brings me to this topic of yours. What have you done to update these wafer units?
Incidentally, in operating my C-22s, I NEVER used the loudness control and I rarely operated the tone controls out of their 12 o'clock positions, where they are essentially out of the circuit, or at least that had been my understanding.
At these "Clinics", factory techs routinely sprayed out all of the controls, including the taper controls on the top and this included those rockers which had issues of their own, chiefly desintegrating foam padding.
At least in the Marantz 7, there are none of these rockers to deal with and no encapsulated modules at all.
Therein lies a difference, but the two circuits are like "kissin' cousins", as you know.
Richard Links
Berkeley, CA
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