Thanks David.

Yeah, you seem to be confirming what I suspected. Even these
days, I think it'd be hard to recover signal above 20kHz from
vinyl with good performance, so I'm still surprised they tried
it in the 70s and expected it to work *in*the*field* with the
domestic blunt-knitting-needle styli (for that's how it's spelt,
Jim Lesurf :-) ) of the day.

I don't think I'll bother buying the quad LP from Ebay.


Martin