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Just in case anyone is interested, the KRK-12 tuner was used on the black and white sets as Steve D. stated and were the 12A and 12B. The first use of the KRK-12 on a color set was in RCA's prototype Model 4. It was then used on the Model5, CT-100 and the 21-CT-55. Sorry Kam, this info still doesn't get you that channel insert!
Steve
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