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You know.....you're right. I've never seen any 15, 20, 31 ect. date codes either. Never gave it much thought till now, very interesting. I think eberts might be right on with the whole warranty thing.
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Kyocera R-661, Yamaha RX-V2200
National Panasonic SA-5800
Sansui 1000a, 1000, SAX-200, 5050, 9090DB, 881, SR-636, SC-3000, AT-20
Pioneer SX-939, ER-420, SM-B201
Motorola SK77W-2Z tube console
McIntosh MC2205, C26
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