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I have seen cases of burned wiring due to heat in CTC-16 and CTC-15's but the problems don't seem as bad on the circuit boards as the CTC-38's. Maybe because the 15's/16's had a larger chassis layout and 3 or 4 circuit boards as opposed to the 2 on the CTC-38, so the heat was not so concentrated. The CTC-15/16 are also an all tube chassis as opposed to the transistorized IF stages on the CTC-38.
There are some rectangular sets such as CTC-17, 30 etc. which use the "deluxe" chassis like on the CTC-16. These just add in the pincushion components for the rectangular tubes. The CTC-31, 38, & 39, were a smaller, cheaper chassis.
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