I came upon a London Audio show entry ticket from 1958. It's in stellar shape. On the back Peter Walker drew a phase splitter schematic and printed his name on it. I scanned it and sent it to a shop who rebuilds the speakers and he thinks it's legit. All the links I could find point to this one for QUAD - bit it doesn't work.
Can anyone tell me how I can reach the company or the QUAD family?