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ONKYO Europe on Twitter: "In September 1980, the P-309M pre-amp and M-509 power amp adapted Onkyo's “double super-servo scheme”. With power amp connected to pre-amp via servo-sensor cable, the distance between them
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Amazon.com: Onkyo TX - NR609 7.2 Channel Network THX Certified A/V Receiver (Discontinued by Manufacturer) : Electronics
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