Zenith – Transoceanic G500 Chassis 5G40 Service Data and Schematic Manual – Zenith
Zenith provided the Transoceanic owners a copy of the Scematic and Service data manual, that was a lot more common back in the tube radio days
They also expected the systems to need alignment in the field, so it was easier to provide the service data and schematic stored inside the radios when they were sold
A lot of Transoceanic G500 Radios still have the original schematic and service data stored in the radio, they are a little yellowed and starting to get brittle, but they are usable
Zenith – Transoceanic G500 Chassis 5G40 Service Data and Schematic Manual – Zenith