Zenith – Model ZE-80 Power Supply Schematic and Parts List Manual – Rider
One of the last separate power supplies before they became standard integrated with the radio
With the move to integrated power supplies, it was common for sets to use AC DC for power, making them more versatile
Odd that today runing of batteries is very common if away from comercial power, most portable radios today use 2 or 4 AA batteries, quiet a bit different than this error
Zenith – Model ZE-80 Power Supply Schematic and Parts List Manual – Rider