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That's CLEAN compared to a lot of the seaside hotel sets I've seen. Mix up a 90/10 mixture of Isopropyl and acetone and give it a good underside rinse. Then take a magnifying glass and inspect the heck out of the underside, cleaning up the solder connections with some solder.
Motorola used 63/37 solder almost exclusively (same solder in their military lines), giving a lower melting point. I've seen a Motorola Annual report and that was one of their "cost saving measures" in the 60's - aligning all of their manufacturing lines to a common 63/37 solder, a common wire vendor (Belden, IIRC) and a common hardware manufacturer (Richco).
Rain and water are easy contaminants. Mouse piss, CocaCola, and liquid fertilizers (watering the plants above the TV today, Mrs. Murphy?) are among the worse. Then there's the yellow glue used by Toshiba and others, a real PITA.
I remember those Motorolas had stiff turning tuners, or maybe undersized knobs. A friend's little sister had one, and she left it on one channel rather than having to nearly break her little fingers trying to change channels.
Cheers,
__________________
Brian
USN RET 22YRS (Avionics/Cal)
CET-Consumer Repair and Avionics ('88)
"Capacitor Cosmetologist since '79"
When fuses go to work, they quit!
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