Early Electronic Television
(click on picture for high resolution image)
The TRK-12 was introduced, along with 3 other less expensive sets, at the 1939 World's Fair in New York. The TRK-12 cost $600, more than the cost of a modest car at the time. The picture tube was mounted vertically, with a mirror in the cabinet lid, because it was so long that, if mounted horizontally, the cabinet would have been almost three feet deep. Here is the RCA Dealer Sheet, courtesy of Eric Coon.
The set had four chassis: one for the television circuits, one for the television power supply, one for the radio and one for the radio power supply.
RCA's service manual for this set described how the set should be viewed:
The TRK-12 has a socket on the rear to allow connection of an external phonograph, such as the RCA model R-100.