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My Silvertone CTC-15 clone has a nuvistor tuner. I don't think it's the same one RCA used. Mine has a 6ds4 nuvistor, and a 6ea8 (if i remember correctly). I believe the RCA versions used a 6cw4 nuvistor and a 6gh8. I think it is an RCA tuner, just not the one RCA used on the CTC-15.
My UHF tuner uses a glass tube. I believe RCA CTC-15's used one with a nuvistor.
John
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