Fleetie wrote:

Thanks, Serge.

Interesting stuff. I kinda suspected that the records with
the HF encoding wouldn't've worked really work well with cartridges
of the time.

I was trying to decide whether it was worth buying the quad
version from Ebay, but you suggest what I suspected, which
was that it's basically impossible to get the quad info off
the vinyl and into my room these days.

The 'quad' effect was simply a gimmick anyway which is the biggest
reason of all it never gained popularity.

Graham