VALVE Magazine Online! Acoustical Quad Article By Dan Schmalle From VALVE Issue 4, April 1994

Enjoy the wrote: This month's demo is a very special one. Through the generosity of Eric and Dave we will audition what is to many vintage buffs the ne plus ultra of vintage high fidelity systems, an entire QUAD system. It will be composed of the QUAD FM Tuner, QUAD Multiplex Decoder, QUAD 22 Control Unit, two Quad II Power Amplifiers and two QUAD ESLs. All of these components are in very nice shape and will be set up as originally intended right down to the KT-66 output tubes.

Acoustical Manufacturing Company, makers of the Quality Amplifier for Domestic use, was started by Peter J. Walker in London in the late 30's.

The original QUAD components were introduced around 1954. At the time the loudspeakers, while revolutionary in their construction and accuracy, were rather poorly received in an era of horn speakers with giant sized bass response. A very interesting interview of Peter Walker can be found in The Audio Amateur, 3/1978. I won't rehash the entire article here (we do have it in the library), but a few select plums from the article help to explain the design philosophy behind Peter Walker's products on differences in amplifiers: