Many thanks for that, I can't remember the exact timeframe of events, I had moved to live on a small island in 1987, the Rotel blew up fairly early on and I bought the Quad's (Luckily for me the only other person on the island into Hi-Fi had just moved up and had them spare), I had been using CD's since they first came out with a CD 101, I phoned Quad and they suggested I sent my board into them and they sent it back modified for CD, I am pretty sure this was about 1988 and have used the Disc input with a CD player ever since.
As it was a long time ago I had forgotten what the other inputs were for.
Cheers for the information.
System a mixture of old and new.
Speakers Tannoy Cheviot, Amp Pioneer receiver but looking for something new, Source Xbox One X (For everything) via a Panasonic 65inch 4k HDR TV.