This is the commercial circuit of the Zenith Royal 500 radio manufactured in the 1960s. The circuit had 7 transistors and was powered by a voltage of 6 V from batteries. The circuit is for the medium wave range of the superheterodyne type.

This is the commercial circuit of the Zenith Royal 500 radio manufactured in the 1960s. The circuit had 7 transistors and was powered by a voltage of 6 V from batteries. The circuit is for the medium wave range of the superheterodyne type.