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I seem to remember there being a lot of unique designs for 15" sets such as Sparton, Capehart, Westinghouse, etc. but after these quit being made it seems like the only 19" or 21" sets out there on the market in the late 50's with non-rca designs were the Motorola and Philco and these may have only been made for a couple of years. Seems like from 57-64 or so all color sets with the exception of Zenith were RCA designs.
I personally have not heard reports of trouble in early Magnavox, Dumont, Sylvania etc.color sets in any greater number than for RCA. The CTC-15 upon which many of the mid-60's sets were based seems to be one of the better designed RCA chassis.
RE: PC boards and tubes...I'm working on a 1956 Wurlitzer jukebox that has tubes on a PC board in the pre-amp and driver stages. This has to be among the first pieces of tube equipment to use the boards. Haven't noticed any heat degradation...it's more when power tubes are on circuit boards that trouble occurs (or when cheap board substrates are used such as in GE sets).
Motorola also made printed circuits of high quality around this time with the tube sockets built in to the circuit board.
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