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A big problem I have seen with RCA's and RCA-clone type sets is that wiring gets burned from power resistors under the chassis. After replacing burned wiring in a CTC-28, I relocated a power resistor which was on a burned terminal strip near cooked wiring out in front of the chassis so it is underneath the picture tube. There is a lot more open air for cooling there and it is not near any wiring.
I also found the high line voltage tap on the power transformer and wired it up in the power supply along with adding a 115VAC coil relay to switch the power. I came across a whole bunch of 115VAC relays and sockets and this takes the heavy current load off the power switch.
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