| 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 |
| 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! |
| 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 |
| 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 |
| 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 |