The short intro: For those who are unfamiliar with the concept, Old Time Radio is the phrase generally used to refer to the time when radio was (mostly) live, and was full of a variety of different shows, as opposed to simply being a … This was often the case with a radio show like this, where one actor would portray more than one character, since, as long as the voice was different, the listening audience would readily accept the illusion, if they were even aware of it.