I was just curious....

Has anyone ever attempted to convert a crappy quad decoder in a old quad receiver or amp (....take your pick) to a decent QS vario-matrix by either building a new decoder from scratch or salvaging from a Sansui (blasphemy.......I know) or modifing a existing plug in cartridge.

You can obviously just plug in a outboard decoder or just get a later Sansui QRX (much easier and less stressful) instead of rebuilding anything. But has anyone, in all these years, defied the Gods and attempted a hardwired QS conversion..?? And....um.....how'd it turn out...

....just wondering