When I started my career I could hear 15,625hz (the line rate of the CRTs in a PAL environment). I can't now, and not just because those CRTs no longer exist.

When I started my career I could hear 15,625hz (the line rate of the CRTs in a PAL environment). I can't now, and not just because those CRTs no longer exist. Alas I can still hear 1khz.