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RCA introduced the 2-board "cheap chassis" as a space saving to make the first 19" sets, the CTC19, then as a budget set, the last roundie CTC20, then the CTC 24, 31, 38 and 39. There were dogs and some lived longer, trouble-free lives.
A theory why some RCA's ate flybacks: All the substitution books said a plain ol' 3A3 could be replaced by a 3A3C, but it was shorter by 1/8", preventing the plate cap from fully seating into the fly. The resulting arcing was sometimes evidenced by poor horizontal lock.
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