The colloquial (and mostly archaic) term "television set" invokes a narrow use of set (noun). Merriam-Webster defines this as:
(22) an apparatus of electronic components assembled so as to function as a unit
(With "television set" being the only example)
The Cambridge Dictionary offers an even more narrow definition, where set has the specific meaning of "television set".
I am wondering what the etymology of this term is here, and I have a guess: I believe that because televisions--and radios before them-- were constructed principally using a set of vacuum tubes that the set is a sort of metonym.
"Radio set" is easily found as a common term in historic text back when radios were larger standalone devices, or in the context of CB or ham radio, both of which grew from vacuum-tube-based equipment.
And I observe that contra the Merriam-Webster definition, no other kind of "apparatus" I can think of gets this shorthand. We don't speak of a toaster set or a dishwasher set or a personal computer set. The only examples I know of are devices that originated with sets of vacuum tubes.
Maybe I'm overthinking this. Can anyone enlighten the tracing of etymology there? Why are (were) televisions known as television sets?