Paul:
Just to learn something from you guys...:-) There are a few records that are recorded as Quadro. So to have a decoder in a beogram is nowadays for collection vallue?
There's not much use for it as a CD-4 decoder, if that's what you're after - not that many records exist, most people won't have the quad amp/speaker setup, you'll need an expensive new/renovated cartridge so that it'll actually play in quad, and finally the recordings aren't that groundbreaking anyway.
The real value is that it functions as a RIAA preamp even in stereo, so the Beogram will have line level outputs and will plug straight into modern kit. And it's an excellent quality preamp as well (may need a recap at this time to live up to its own standards, though).