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"Your transfer and reproduction of my beat up vinyl 33 1/3 recording of a High School Concert 50 years old sounds better than when I played the record for the first time on my "High Fidelity" system in 1957. Your technology is amazing, as I hoped it would be. Thank you for your expertise and for all of your extra time in answering all of my ..."

Ring modulator

Device which may be used to produce sum and difference frequencies of two signals applied to the input.