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Most were a module as some areas needed a channel 2/3 or 3/4, I've even seen a channel 5/6 that was in a JVC Vidstar. Sony used a trimmer cap in theirs but anything goes with Matsushita, you could try tweaking the core slug in the modulator to see if that shifts the frequency enough for your sets AFC to grab on to, the other issue might be the AFC in the set is thermal and cold causes it to drift outside it's range. Without actually checking the carrier of the sources against a known standard it's difficult to say whos drifting around. I use a Motorola R2670 service monitor for my reference, it's only +8hz off a Stamford FS725 rubiduim standard on the 9th harmonic.
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