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purchased over-the-counter or delivered and installed by an authorized mcintosh ... dealer mcintosh products that are purchased over the internet by phone or ... mail order are presumed to be used and do not qualify for any mcintosh ... warranty mcintosh does not warrant in any way products that are purchased from ... anyone who is not an authorized dealer or products that have had their ... serial number altered or defaced ma2275 vacuum tube ... integrated amplifier flexibility 6 sets of unbalanced inputs ... main preamp-out/amp-in connection and one additional set of switched preamp ...