There was a VERY short time era where there was the use of the “space charge” tubes feeding into a Germanium
Power Output transistor. Circa ~1958. What we would need is for you to examine the set and locate a model number to
be able to research from.
Motorola is usually good, in the respect of their model numbers being pressed / stamped deeply into the metal of the
housing of the radio. Thus, you still being able to get that model number; otherwise, I don’t think any research could be
done without its model number to work from.
73's de Edd