Hello again all!I am wondering how they are able to make the rf coils so tiny,like half an inch or so in the later radios as compared to the bigger or REALLY BIG coils in the late 1920's early 30's sets? I read somewhere that "Phillips" had invented some of these.The same goes for the tuning caps.Some of them from the 1920's sets are almost a foot long and look like a STEAM TURBINE!!How are they able to make them so small (inch or so) in the 1950's sets?

It is the progress of miniaturization. Some circuit boards at work are basically becoming a big chip. They are manufactured by machine as the components are far too small to place by hand. Pretty soon they will become non-serviceable.
The lower current and voltages in the RF sections of transistor sets didn't need the robust build of the higher voltages and currents found in the RF sections of tube sets.

: It is the progress of miniaturization. Some circuit boards at work are basically becoming a big chip. They are manufactured by machine as the components are far too small to place by hand. Pretty soon they will become non-serviceable.
: The lower current and voltages in the RF sections of transistor sets didn't need the robust build of the higher voltages and currents found in the RF sections of tube sets.
:
Lewis