> The wikipedia description of a "preselector" sounds close to what they described: It's also the description of a tuned RF stage, which any decent radio has.

> The wikipedia description of a "preselector" sounds close to what they described: It's also the description of a tuned RF stage, which any decent radio has. Except for cheap ones which make you manually tune it, and call that a "feature". And read again what I said about the main IF filter. That's the one which removes adjacent stations.