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Zenith uses a variable inductor, and are well known for DXing, but most other use that little alum box with a spring loaded pull string (that is what RCA, magnavox, and motorola to name a few). Prettty sure its a German made tuner, and while it works fine, I dont think its very sensitive. the "distance" zentihs have a tuned RF inductor on the fron end (besides the reg osc/tuner), the little german box does not.
On the better RCA tuners there is a VC for the FM, not the little box, and it has a 3rd VC for the tuned RF front end. I have found this setup to be the best for DXing, comparable to the "Distance" zeniths.
The only thing I did not like about the RCA was the stereo de-emphasis circuit seemed to go a bit overboard, killing the highs more than the mono de-emphasis. My guess is the engineers were trying to get rid of any mpx noise.
I changed out a couple caps in the de-emphasis on the stereo and it sounds much better.
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