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O.K., I guess the 12 was the one that was like the 15 but used an octal horiz. output tube (6DQ5?)
It seems to me like the revisions of this chassis are:
CTC-12: Octal H.O. tube, selenium focus rectifier, 3a3 and 6Bk4 mounted horizontally above flyback in cage.
CTC-15: Similar to CTC-12 except uses 6JE6 9-pin H.O. tube.
CTC-16: Uses the flyback where the 3A3 plugs into it. Uses a tube type focus rectifier.
CTC-17: Same as CTC-16 but uses rectangular crt, adding pincushion components and degausser.
CTC-25: Similar to CTC-17 but uses transistorized audio section.
CTC-28: Returns to tube type audio section.
CTC-35: All models equipped for remote control.
All of these seem to be essentially similar...there were also some other changes along the way, such as using a bridge rectifier rather than a voltage doubler and substituting solid state diodes for the 6JU8.
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