we never realized this before but apparently
the reason things sometimes say "do not remove cover, no user serviceable parts inside" is because in anything made before the 60sish it would be common to open up the TV or radio or whatever and swap out the tubes
so when things became all transistors (except for the CRT, in televisions) they would put notes on them saying that, because things at the time were expected to be user-serviceable because tubes wear out
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@Felthry specifically junction transistors, i guess? point contact transistors made valves look pretty reliable :-/
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@thamesynne I don't think point-contact transistors were ever used in any products. These would be alloy-junction ones, presumably, or grown-junction slightly later.
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