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RCA had a "cable ready" tuner option on the CTC-68 (and I'm sure later.) That may be what you have. The UHF tuner was labeled "A" through "L" and was varactor-tuned. There was a switch by the antenna connections that threw that bank over to cable - there should be a converter in there somewhere.
If it's a CTC-68, the UHF tuner will be KRK194B; the converter is KRK212.
If that is what you have let me know - I have an RCA manual that explains it pretty clearly. I'd scan it for you.
Last edited by AUdubon5425; 03-10-2011 at 09:04 AM.
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