1948 broadcast-band 5-valve tablegram
Re-released 2 years later as the 505T-RG - check which version you have. This one has the power transformer mounted on the left side of the chassis, looking in from the back - the 505 has it on the right.
Valves (5): X65 or 6K8, KTW63, DH63, EL33, 6X5
Frequency Bands: 1
Chassis Notes(most schematics can be clicked to download a full size version)