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Normally I'd say its out of alignment, but its vaguely possible (this is a long stretch) that the B+ voltage is low due to the selenium rectifier beginning to fail, which is causing the oscillator to drop out down low. More than likely its an alignment problem but I'd check the B+ just for yucks. I had problems like that with my import sets. When set to 127v on a 125v line voltage, the FM band would drop out below about 95 mhz. I set it to 115v, and it brought the B+ up to spec. No more FM band problems.
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Random bits of stuff in the collection:
Yamaha YP-D4 turntable with B&O MMC 10E cart
Allied 495 receiver
2 Magnavox amps, AMP150 and an AMP178, currently under the knife.
Onkyo TX-4500
Onkyo Radian III speakers
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