Three-program receiver '' PTV-61 ''.
Three-program receivers.The three-program broadcasting set-top box "PTV-61" has been produced by the Riga plant "Radiotekhnika" since 1961. "PTV-61" is one of the first domestic set-top boxes for receiving two additional high-frequency radio programs transmitted over a dense wire broadcasting network. The three-program broadcasting set-top box works in conjunction with any subscriber loudspeaker powered from the mains.
