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The Institute of High Fidelity Announces New Standards for amplifiers
An article on new measurements and revised test techniques by Daniel von Recklinghausen, HiFi/Stereo Review, January 1966
A traveller's report on The British Audio Establishment
by Norman Eisenberg, High Fidelity Magazine, April 1965 - A fascinating look at Britain's leading manufacturers as seen by a visiting US journalist!
The Williamson amplifier
the original article from Wireless World, 1947
An Ultra-Linear Amplifier
by David Hafler & Herbert I. Keroes, Audio Engineering November 1951
The Mullard 20-watt amplifier
(1961) Complete description of how to build this classic design including detailed circuit description, diagrams and parts list
Mullard EL34: A New 25 W Audio Output Pentode
published by Mullard Ltd, 1952
High Fidelity Power Amplifiers - design aspects
published in Radio Electronics, May 1956
Modifying the Leak Stereo Twenty
an article by Geoff Kremer of Service Sound, UK (including circuit diagrams)
Valve Amplifiers - do they really sound different?
an excerpt from an Australian Hi-Fi magazine, 1977 discussing the relative merits of valve and solid state technologies
Stereo - Why Bother?
An amusing article by Jack Baya taken from HI-FI TAPE RECORDING, December 1956
The Business that did not exist
an interview with Avery Fisher taken from High Fidelity Magazine, October 1962