That's incredible, Walter
still working and with original valves?
Wow! the precursor to the legendary Quad II?

Before my time, I'm afraid, but I've read about it all, from the original Williamson amplifier?? in Wireless World?? in the 40s?

The Quad was then the first to 0.01 distortion amp?

They still market a valve Quad today, have you seen the prices?.... Whew!!!!