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We never had this set in Europe, virtually all Philips portable sets from that age (none under 13") had Philips' own KT2, KT3, KT4 or CTX chassis and were AC only.
Date codes on Japanese ICs are quite cryptical, you'll see something like 9A3, the "9" usually means a 1979 or 1989 manufacturing year, but i don't know how to read the other two digits (which i assume are indicating week or month)
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