Exaviator,
Ah, the 4-course range approach. Had forgotten about them. I think there were a couple left in the US when I started instrument training. Pretty sure it was covered in the Zweng manual and we may have taken a run at a few in the hissing, lurching C-8 Link but fortunately, I never had to wrestle a real one...can't say I regret it !
Fixed-azimuth ADF...that was also a mental gymnastics event. :-))