coloour/coloured TV

"Colour" is correct in Great Britain.

"Color" is correct in the US.

One never refers to a "coloured" television set.

Thanks, Phoenix

Here is a nice article where the expression is used many times:
http://novia.net/~ereitan/CBS_Chronology_rev_h_edit.htm

Thank you very much, Phoenix.

The term "colored television" was in common use during the development stage of color TV. The term "color tv" might have become the standard to maintain parallelism with the term "black and white tv".

Thanks, Flyboy.