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A CTC-20C would be a valid model with the appearience of the 16Xx's. This chassis started out as a CTC-19 series for the 19" portables but with no pincusion correction and other changes to support the 21" tube demands. This was RCA's last roundie and was generally considered a "value priced" set with carryover parts, bezels etc. This smaller sized configuration is loaded with 6GH8 tubes which can be quite finicky but you can get a nice picture out of it. The correct Sams for the 20's is 837-2.
I don't know if you have access to a CRT checker but it would be good to know the condition of it before proceeding. Be cautious in seperating the socket from its base as they can break loose quite easily. And it's normal to see some Flyback drippings..once the set is running it is always wise to verify the current draw on the horizontal output tube. As long as the CRT is in usable shape, go through the whole set before getting yourself concerned about the cataract. Sometimes a weak tube can perform well so hold off on any rejuvinating as nowadays that's a last resort since supplies are limited.
There's lots of us here to lend you some support!
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