True Geoff, one exception being the original (not the Mk.2 version, however) Thorens TD-124, which has a ferrous sub-platter, making it unsuitable for use with Decca/London cartridges.
Turntable Platter Demagnetizing
I was wondering if I use a tape deck head Degausser if that would demagnetize the turntable platter. Anyone out there have some thoughts on this also any other ideas about this matter ?