Motorola Model 66T1 Transistor Radio (1957)
Can you spell 1950s? The Motorola Model 66T1 transistor sports a
snazzy chrome and black case, accented with yellow and red.
This was Motorola's second transistor radio. Dating from 1957,
it was preceded by Model 56T1.
It measures 5.5 by 3.5 by 1.5 inches with the handle folded
down. The hinged metal case makes it heavier than you'd expect.
As in other Motorola portables, including
tube models, the antenna is
contained in the handle. When the cabinet is made of steel, the antenna
obviously needs to be located outside. You can also use the
handle as a support to tilt the radio back.
This radio came complete with its original box and owner's manual—a
welcome bonus for any collector.
When stowed in the box, the handle is folded all the way down, below
This is a six-transistor radio with a printed circuit board. The
transistor cases look like little rounded metal rectangles in
this chassis view.
Here is the 66T1's schematic diagram.
Like many old transistors, this one suffered corrosion damage from a
leaking battery. The damage looks worse than it is in fact. The
corrosion was confined to the case back and battery carrier,
discoloring the paper label but not touching the electronics on the chassis.
Rust is easy to remove from metal parts, but I'm afraid the label is
Here are the manual pages. They are saved in fairly large size and
printable in portrait mode for anyone who wants to reconstruct the manual.
I haven't yet tried out this radio. That will have to wait until I clean
up the battery area and reattach a little green wire that broke loose from
the earphone jack in the back cover.