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Can someone with a "Super" CTC-5 try the fine tuning to see if it affects the sound volume?
I 've read up on the schematic of the sound section and operation of the ratio detector. This chassis (the Super) has only one sound IF stage instead of two (in the Deluxe), so it may be gain-challenged. The ratio detector has some built-in AM rejection capability, but my understanding is that its output level due to the FM deviation is also proportional to the intercarrier amplitude if there is no limiting preceding the detector.
I've also ordered a couple of replacement sound IF tubes to see if that offers any improvement.
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