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Actually I think the CTC-20 is more similar to the CTC-31. The CTC-31 was used in the same types of sets as the 38 (the 22" table and 23V table and console) and has a similar chassis layout. However the CTC-31 is all tube type except it may have one or two transistors in the color killer/ACC.
I have seen photofacts for Magnavox round color sets from 1969 and 1970. These were probably produced as a lower cost alternative to the rectangular sets and to use up the stock of the round CRT's. However these were all-tube sets, as all of the Magnavox color sets were at this time.
It seems logical to me that Philco would have just taken their usual color chassis at the time (1969) and made a round color set out of it, probably just to make a lower-cost set...it could have also been a "loss leader" designed to get people in to the store:
the ad could have been PHILCO COLOR TV $299 or something like that, without a picture of the set. When people found out that it was an old-fashioned round set the salesman might have tried to sell them on the, say, $379 rectangular set.
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