RCA TRK-12
Extra Chassis in the TRK-12
At the top left is the television chassis, and at the top right is the radio chassis. The radio power supply chassis is to the left on the bottom of the cabinet, while the television power supply chassis is to the right of it. The extra chassis is below the television chassis and was used to demonstrate the set at the 1939 World's Fair.
National Radio News, Aug-Sept. 1939