I also have a (older) Quad amp and pre-amp, inherited from my Dad who I think got them in the 80s. They sound sweet although not nearly as pretty as @Joe Mac'sJust noticing the equipment you've listed and imagining those Quad mono blocks are pretty sweet! I recently upgraded my system to Quad Artera Stereo (power amp) and Play+ (preamp + DAC + CD player) and I'm pretty happy with them. But I think yours is the first Quad component I've seen listed, and I don't think it's a common brand in the US.