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The QUAD 1 from The Acoustical Manufacturing Company.
The Acoustical Manufacturing Company was formed in 1936 by Peter Walker. His career had started with EMI and GEC. His company was originally called S P Fidelity Sound Systems but was soon changed. The Acoustical Manufacturing company initially produced public address systems and amplifiers.
In 1951 the QUAD 1 was introduced. The acronym stands for Quality Unit Amplified Domestic. The QUAD 1 was a mono amplifier and the circuit is presented below.
Circuit diagram. The valves used are EF36 or EF37 or EF37A, KT66 and GZ32 or 5U4G.
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