Quad

II

Amplifier, Power

Main Details
Maker Quad Company
Function
Signal Path Analog Hardware
Made In UK
Date Produced 1953-1969
Dimensions W 318mm H 162mm D 119mm
Weight 9.3kg
Power Source AC 240V
Notes Valves: EF86, KT66, GZ32

The history of Quad is one of technical achievement in the field of sound reproduction. It is a story that began with the Quad 1 amplifier, which brought the benefits of 15 years knowledge and experience in professional audio and industrial products to the task of making the most accurate domestic audio amplifier of its age.

A few years later, in 1953, the product which set the standard for amplifiers was the Quad II Power Amplifier, the time of Queen Elizabeth's Coronation and the year in which Mount Everest was finally conquered. This amplifier pioneered the principle of cathode coupling through the output transformer to reduce harmonic distortion to almost negligible levels. Such was its clear superiority that this model remained in production for 18 years. Three years later, in 1956, Quad demonstrated the first true full-range electrostatic loudspeaker. This remarkable product (known later as the ESL 57) used a virtually mass-less plastic film as a moving diaphragm between two charged plates. Compared with moving coil loudspeakers, the ESL 57 was free of unwanted colourations and distortions. This landmark product remained in production, virtually unchanged, for 28 years.
Additional Specifications
Power output 15W Into 15 or 7 ohms
Connections
Audio input (6-pin Bulgin)
Connector: Other
Speaker output
Connector: Banana

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