movie 1980 boy wants to buy a second hand radio

A radio salesman is trying to sell some gypsies a radio. But they have their easy to operate crystal ball, that even works as a TV. They show him how easy it works by listening to the doings of the Rhythm Boys, Tito Guizar, the Picken Sisters and Ann Lee, and let him try to receive a Frank Hazard program.

1971, Bulgaria under Communist regime. A time when people are systematically oppressed a father decides to walk almost 100km to the nearest town so he can buy a new radio for his rock 'n roll obsessed son.