Is it just a white raster with no snow? If so, assuming the I.F. strip is fine, the tuner might just need a good cleaning. If that thing has been sitting a long time (probably has) the contacts in the tuner kinda glaze over with corrosion and impurities from the air. I've had that happen to several sets that were in storage a long time. A shot of De-Oxit cured them and they still are working great. Good luck with that cute little set  It's one of the ones on my "wish" list. Made by Mitsubishi IIRC.
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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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