I acquired a shortwave radio receiver from the 50's- 60's era. Like other shortwave radios of that era, it contains tubes. Also, the speaker is in a separate cabinet that is connected to the receiver.
I read that the speaker is kept separately from the tube receiver for a couple reasons: 1) the heat from the tubes can make the cabinet quite hot and adversely affect the speakers, and 2) the vibration from the speakers can be disruptive to the tubes. I don't know how true either of these assertions are, but they sound reasonable. In the late 60's onward, as shortwave radios replaced tubes with solid state components, they started including the speaker within the receiver itself.
My question is, if these reasons for keeping the speaker separate from the tube receiver are true, why did television sets from that era contain the speaker within the set itself?