[ARC5] Tuning Cable Question

[Robert Eleazer]

As we all know the tuning knobs for the earlier TRF radios like the RU and SCR-283 are larger than the ones used for the SCR-274-N and ARC-5 types.  As I found to my dismay when I bought a tuning knob in a store in San Diego many years ago, only to find it would not fit the radios I had. 

Is this because the TRF sets had more mechanical stuff to turn than the superhets and thus needed cables capable of handling the extra load? 

I guess that same kind of cable is used on the ARN-6 as well.

Wayne