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Since ours is a CT-11, not a 12, perhaps the earlier PCBs were a different design and/or more durable composition?
Have seen that problem in older tube stereos too, we had a Heathkit AA100 amp (7591 tubes) once where the boards got so hot they were scorched charcoal black! Not our favorite Heath model, so can't believe the prices being asked on eBay for them now, when similar era Scotts & Fishers didn't tend to have that problem, being point-to-point they didn't suffer that fate. Some GE consoles we've seen had heat scorched and brittle PCBs too, even from little 6AQ5s! However I've seen some mass-market tube-era consoles that were OK, mostly lower power jobs though.
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Happy Motoring!!
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