Updated: 28 Oct 2009 More WW articles added

CONTENTS Pre and Power Amplifiers in WW/EW Power Amplifiers in Elektor Some Circuit Ideas from WW/EW

This is a so far incomplete (but growing) collection of the significant EW audio articles. If nothing is shown for a given year this simply means I haven't got round to it yet.

I have given some of them my own rating as to worthiness; if you disagree please let me know. In a few cases I have put down my thoughts on their value... click on Comments.

Most of my articles up to 2004 are now available in one handy volume: Self on Audio The perfect gift for all the family.

First-rate. Innovative	One of mine. As good as I can make it.	Competent but unexciting	Misleading or pointless	Just plain wrong! Sorry but there it is.
Repeat offenders have colours assigned to their names.

Subject	Author	Issue		Page
1950
1952
Negative-Feedback Tone-Control	Peter J Baxandall	Oct	1952	p402		Comments
1960
1965
Transistor High-Quality Audio Amplifier: Part 1	J Dinsdale	Jan	1969	p2		Comments
Transistor High-Quality Audio Amplifier: Part 2	J Dinsdale	Feb	1965	p68
A Feedback PWM Audio Amplifier	Turnbull & Townsend	Apr	1965	p160		Comments
1966
High-Performance Transistor Amplifier (20W power amp)	Arthur Bailey	Nov	1966	p542		Comments
High-Performance Transistor Amplifier (preamp)	Arthur Bailey	Dec	1966	p598
1967
Efficiency Considerations In a Class-D Amplifier: Part 1	Turnbull & Townsend	May	1967	p154		Comments
Efficiency Considerations In a Class-D Amplifier: Part 2	Turnbull & Townsend	June	1967	p214
1968
Low Distortion Class-B Output	anon	Apr	1968	p67		Comments
30W High Fidelity Amplifier	Arthur Bailey	May	1968	p94		Comments
Loudness Control for a Stereo System	R T Lovelock	Jun	1968	p148
Output Transistor Protection in AF Amplifiers	Arthur Bailey	Jun	1968	p154		Comments
High Input-Impedance Amplifier Circuits	T D Towers	July	1968	p197
Stereophonic Image Sharpness	H D Harwood	July	1968	p207
Computing Distortion	Arguimbau & Fanger	July	1968	p228
Voltage Following	Peter Williams	Sept	1968	p295
1969
Editor: H W Barnard
Negative Feedback and Hum	G W Short	Mar	1969	p116
A Simple Class A Amplifier	J Linsley Hood	Apr	1969
Quasi-Complementary Output Stage Modification	I M Shaw	Jun	1969	p265
The Vital Statistics of an Audio Amplifier (supplement)	R Williamson	Jun	1969	p265
Modular Pre-amplifier Design	J Linsley Hood	July	1969	p306
Low-cost 15W Amplifier	Hardcastle & Lane	Oct	1969	p306		Comments
A Design in Retrospect (Dinsdale pre & power amplifiers)	J Dinsdale	Nov	1969	p500
Stereo Image Width Control	A Roberts	Dec	1969	p579
1970
Tone-Balance Control	R Ambler	Mar	1970	p124
15-20W Class AB Audio Amplifier	J. Linsley Hood	June/July	1970
Ultra-low Distortion Class-A Amplifier	L Nelson-Jones	Mar	1970
1971
A New Approach to Class-B	P Blomley	Feb	1971	p57
1972
Low-noise Audio Amplifiers	H P Walker	May	1972	p233
1973
Audio Power Amplifier (A+)	P L Taylor	June	1973	p301
1974
1975
Current Dumping Audio Amplifier	Peter Walker	Dec	1975	p560
A High-Quality Compressor/limiter	Douglas Self	Dec	1975	p587
1976
Transistor Driver for Valve Amplifiers	Seth Berglund	Apr	1976	p36
An Advanced Preamplifier (MRP1)	Douglas Self	Nov	1976	p
1977 Scan start
Non-linear Distortion in Audio Amplifiers 1	Matti Otala	Jan	1977	p43
Distortion in Low-Noise Amplifiers 1	Eric Taylor	Aug	1977
Distortion in Low-Noise Amplifiers 2	Eric Taylor	Sept	1977
Additions to the Advanced Preamplifier	Douglas Self	Oct	1977
1978
A New Distortion Measurement	R A Belcher	May	1978	p36
Loudspeaker System Design: Part1	Siegfried Linkwitz	May	1978	p52
Audio Power Amplifier Design: Part 3	Peter Baxandall	May	1978	p83
Current Dumping: Does it Work? Part 1	Vanderkooy & Lipshitz	June	1978	p38
Loudspeaker System Design: Part2	Siegfried Linkwitz	June	1978	p67
Valves vs Transistors	James Moir	July	1978	p55
Audio Power Amplifier Design: Part 4	Peter Baxandall	July	1978	p76
Current Dumping: Does it Work? Part2	Vanderkooy & Lipshitz	July	1978	p83
Audio Power Amplifier Design: Part 5	Peter Baxandall	Dec	1978	p53
1979
A High-Performance Preamplifier (MRP4)	Douglas Self	Feb	1979	p40
Audio Power Amplifier Design: Part 6	Peter Baxandall	Dec	1978	p69
1980
Audio Gain Controls:Part 1	Peter Baxandall	Oct	1980
Audio Gain Controls:Part 2	Peter Baxandall	Nov	1980
1981
Measuring TIM in Audio Amplifiers	Antoniazzi et al	May	1981	p45
Cartridge Alignment Gauge	R Gilson	Nov	1981	p49
1982
Simple Power Amplifier	Peter Wilson	Apr	1982	p56
80-100W MOSFET Audio Amplifier: Part 1	John Linsley-Hood	June	1982	p40
80-100W MOSFET Audio Amplifier: Part 2	John Linsley-Hood	July	1982	p63
80-100W MOSFET Audio Amplifier: Part 3	John Linsley-Hood	Aug	1982	p29
Class S	A Sandman	Sept	1982	p38
Modular Preamplifier: Part 1	John Linsley-Hood	Oct	1982	p32
Audio Oscillator with Toneburst	J Tiernan	Oct	1982	p59
Binaural Recordings & Loudspeakers	J H Buijs	Nov	1982	p39
Modular Preamplifier: Part 2	John Linsley-Hood	Nov	1982	p60
How Will CD Affect Audio Design?	R Harcourt	Dec	1982	p73
1983
Modular Preamplifier: Part 3	John Linsley-Hood	Jan	1983	p46
Interface Intermodulation	R R Cordell	Feb	1983	p30
Modular Preamplifier: Part 4	John Linsley-Hood	Feb	1983	p79
High Power High Quality Amplifier Using MOSFETS	E Borbely	Mar	1983	p69
Aspects of Audio Amplifier Design	Y Miloslavsky	July	1983	p54
Current Dumping Review: Part 1	M McLoughlin	Sept	1983	p39
A Precision Preamplifier (MRP10)	Douglas Self	Oct	1983	p31
Current Dumping Review: Part 2	M McLoughlin	Oct	1983	p35
1984
Compensated Active Summer	A M Soliman	Feb	1984	p58
1985
Audio amp symmetry	John Linsley-Hood	Jan	1985	p261
1986
Not a good year for audio articles.
1987
Crossover Distortion in Class-B amplifiers	Erik Margan	July	1987	p739
Moving-Coil Head Amplifiers	Douglas Self	Dec	1987
1988
Science & Subjectivism: Pseudo-science in Audio	Douglas Self	July	1988
1989
Feedback & FETs in audio amplifiers	Ivor Brown	Feb	1989	p123
A/AB mosfet Power Amplifier	John Linsley-Hood	Mar	1989	p261
PSU & protection for for A/AB mosfet Power Amplifier	John Linsley-Hood	May	1989	p524
Designing Low-noise Audio amplifiers	Wilfried Adam	June	1989
Microcomputer- Controlled Preamplifier	Peter Kruger	June	1989	p584	*
Solid-state Audio power: History.	John Linsley Hood	Nov	1989	p1042
Solid-state Audio power: Blomley, Current Dumping, Class-S	John Linsley Hood	Dec	1989	p1164
1990
Solid-state Audio power: gain stages.	John Linsley Hood	Jan	1990	p16
Audio power, FETs and feedback.	Ivor Brown	Apr	1990	p343
Audio Preamplifier design: 1	John Linsley-Hood	June	1990
Audio Preamplifier design: 2	John Linsley-Hood	July	1990
Variable-Slope Low-Pass Filter	Reg Williamson	July	1990
Audio Mixer design	Richard Brice	July	1990
Audio Preamplifier design: 3	John Linsley-Hood	Aug	1990
Sound Mosfet Design	Douglas Self	Sep	1990	p760		Comments
Reducing Crossover distortion.	Michael McLoughlin	Oct	1990	p879
Distortion from power supplies	Greg Ball	Dec	1990
1991
Inside Mixing Consoles	Douglas Self	Apr	1991
Digital amplifier developments	Andy Gothard	Jul	1991	p554
Transistor-driven valve amplifier	John Linsley Hood	Aug	1991	p676
Who designed this?	Dr Aubrey Sandman	Sep	1991	p788
1992
Opto-bias for better power amps	Ivor Brown	Feb	1992	p107
Sound Model for Audio Design?	Ben Duncan	April	1992	p332
VCAs	Malcolm Hawksford	April	1992	p338
Microphone preamplifier	Tim McCormick	May	1992	p402
200 watt Audio amplifier	Andrew Hefly	June	1992	p454
Golden Ears Hypothesis	Ben Duncan	June	1992	p466
Digitally Controlled Preamplifier	Chris Miller	Sept	1992	p718	*
PSU Regulation & Audio Performance	Ben Duncan	Oct	1992	p818
1993
Opamp Tests.	Ben Duncan	Jan	1993	p42
Integrated Audio amplifier.	John Linsley Hood	June	1993	p454
Audio Power Amplifier	Marco Corsi	July	1993	p547
Microprocessor-Controlled audio Preamplifier	Martin Eccles	July	1993
Solid-state Audio Switching	Mike Meechan	July	1993
Audio power chip review.	Ben Duncan	Oct	1993	p804
Distortion In Power Amplifiers: Part 1 of 8	Douglas Self	Aug	1993
1994
Square-Law amplifiers	Michael Williams	Jan	1994	p82
Distortion In Power Amplifiers: Part 8 of 8	Douglas Self	Mar	1994
Low Distortion Audio Oscillator	Ian Hickman	May	1994	p370	*
Common-emitter power amplifiers	Douglas Self	Jul	1994	p548
High speed Audio power.	Douglas Self	Sep	1994	p760
Audio Amplifier with Feedforward.	Giovanni Stochino	Oct	1994	p818
Better Audio from Non-complements?	Bengt Olsson	Dec	1994	p988
1995
Ironing out Distortion Part 1 (Part 2 Jul 97)	Edward Cherry	Jan	1995	p14	*
Piggy-Backing Audio ICs	Ben Duncan	Jan	1995	p26
Between amplifier and speaker.	Ivor Brown	Feb	1995	p114
Distortion off the rails	Douglas Self	Mar	1995	p201
Fast power amplifier for audio	Ian Hegglun	Mar	1995	p240
Low Distortion Attenuator	John Linsley-Hood	Apr	1995	p320	*
Simulated Attack on Slew Rates	Ben Duncan	Apr	1995	p303
Fets versus bjts	Douglas Self	May	1995	p387
Delayed Audio Signals	Ben Duncan	May	1995	p391
Trimodal audio power: Part 1	Douglas Self	Jun	1995	p462
Power ICs On Trial	Ben Duncan	Jun	1995	p477
Trimodal audio power: Part 2	Douglas Self	July	1995	p584
Double Mirrors Reflect Higher Speed	Bengt Olsson	July	1995	p571
20 Hz Sub-woofer	Jeff Macaulay	Aug	1995	p636
Expert witness: bjts v mosfets	John Linsley-Hood	Aug	1995	p684
Analogue Processing: Slew-Rate Limiting	Ian Hickman	Aug	1995	p684
Few compliments for non-complements (2-stage power amps)	Douglas Self	Sep	1995	p763
Square law rules in audio power	Ian Hegglun	Sep	1995	p751
Ultra-fast Amplifier	Giovanni Stochino	Oct	1995	p835	*
Hot Audio Power- Valve/Semi Hybrid	Jeff Macaulay	Oct	1995	p856	*
Controlling Audio Dynamic Range	John Linsley-Hood	Nov	1995	p938
Audio Preamp- Simple But Sound	Reg Williamson	Dec	1995	p1012	*
Classic Valve Power	Morgan Jones	Dec	1995	p1034
1996
Fresh Look at Valve Power	Morgan Jones	Jan	1996	p24
High Performance THD Meter	Ian Hickman	Jan	1996	p52
Modelling Cable	Ben Duncan	Feb	1996	p119
High Power Valve Amplifier	Morgan Jones	Feb	1996	p110
Notes On Free Phasing	Ian Hickman	Feb	1996	p124
Audio power with a new loop	Marcel van de Gevel	Feb	1996	p140
Non-slewing Audio power.	Giovanni Stochino	Mar	1996	p256
Designing Valve RIAA Preamps: Part 1	Morgan Jones	Mar	1996	p190
Designing Valve RIAA Preamps: Part 2	Morgan Jones	Apr	1996	p290
Speaker Feedback	Ian Hegglun	May	1996	p378
Thermal dynamics of power amps: Part1	Douglas Self	May	1996	p410
High Performance Mic Preamp	Simon Bateson	May	1996	p420	*
Thermal dynamics of power amps: Part2	Douglas Self	June	1996	p481
Precision Preamp '96: Part 1	Douglas Self	Jul/Aug	1996	p540
New Relay for Power Audio	Barclay McKenna	Jul/Aug	1996	p562
Speaker Cable Differences	Ben Duncan	Jul/Aug	1996	p570
Class A power	John Linsley-Hood	Sep	1996	p681
Precision Preamp '96: Part 2	Douglas Self	Sep	1996	p708
Rationalised Phono Preamplifier	Simon Bateson	Oct	1996	p758	*
Thermal dynamics of power amps Part3	Douglas Self	Oct	1996	p754
Filter Variations	Ian Hickman	Oct	1996	p769
Night Thoughts on Crossover distortion	Douglas Self	Nov	1996	p858
Hybrid power amplifier	Wim de Jager	Nov	1996	p897
Gain from Passives	Ian Hickman	Nov	1996	p842
Measuring Speaker Cables: 1	Cyril Bateman	Dec	1996	p925
Speaker Cables Pulse Tested	Eric Foster	Dec	1996	p930
1997
Load-invariant audio power	Douglas Self	Jan	1997	p16
Measuring Speaker Cables: 2	Cyril Bateman	Jan	1997	p52
Overload Matters (RIAA overload)	Douglas Self	Feb	1997
Measuring Speaker Cables: 3	Cyril Bateman	Feb	1997	p119
Filters Using Negative Resistance	Ian Hickman	Mar	1997	p217
Ultra fast Audio amplifier. #1	Giovanni Stochino	Apr	1997	p278
Balanced line inputs and outputs: Part 1	Douglas Self	Apr	1997
Balanced line inputs and outputs: Part 2	Douglas Self	May	1997
Error feedback in audio power	William de Bruyn	Jun	1997	p476	*
Measuring Speaker Cables	Ben Duncan	Jul	1997	p570
Ironing out Distortion Part2 (Part 1 Jan 95)	Edward Cherry	Jul	1997	p577
The Audio power interface: Part 1	Douglas Self	Sep	1997	p717
The Audio power interface: Part 2: cables	Douglas Self	Oct	1997
The Audio power interface: Part 3: speakers	Douglas Self	Nov	1997
1998
Diagnosing Distortion (THD residuals)	Douglas Self	Jan	1998	p32
Loudspeaker undercurrents (Otala excess currents)	Douglas Self	Feb	1998	p98
THD analyser	John Linsley-Hood	Feb	1998	p104
Stereo Audio Monitor	Robert Kesler	Mar	1998	p225
Class B in a new class	Mike J Renardson	Apr	1998	p274
Amplifier Instability	Erik Margan	Apr	1998	p311
A Perfect Variable Oscillator?	Ian Hickman	June	1998	p485
Gain-stage investigations	John Linsley-Hood	Jul	1998	p578
Ultra fast Audio amplifier #2	Giovanni Stochino	Aug	1998	p633
1999
Class A to 300W	Colin Wonfor	Mar	1999	p188		Comments
Class distinction in Amplifiers	Douglas Self	Mar	1999	p190
Zero Distortion?	Ian Hickman	Mar	1999	p224
Hotter SPICE- improved MOSFET models	Ian Hegglun	Mar	1999	p394
Early Effect: Part 1	Bryan Hart	June	1999	p474
Relay muting	Douglas Self	Jul	1999	p544
Early Effect: Part 2	Bryan Hart	July	1999	p591
Cool audio power: Part 1 (Power Partition Diagrams)	Douglas Self	Aug	1999	p657
Precise Active Crossover	Bill Hardman	Aug	1999	p652
Measure THD Below 0.001%	Ian Hickman	Aug	1999	p626
Cool audio power: Part 2 (Power Partition Diagrams)	Douglas Self	Sept	1999
Fast audio power	Yuri Ezhkov	Sep	1999	p723
Class A, 32W from a 12V rail	Richard Burfoot	Nov	1999	p934
Audio power analysis	Douglas Self	Dec	1999	p1033
A new Class AB design	Wim de Jager, van Tuy & van der Ven	Dec	1999	p982
2000
Adaptable Active Speaker Design	Christof Heinzerling	Feb	2000	p105
Notch Filters	Ian Hickman	Feb	2000	p120
Hybrid audio power	Wim de Haan	Mar	2000	p198
Class T is Hi-fi?	Ian Hickman	Apr	2000	p274
JLH A Lifetime In Electronics	J L Hood	May	2000	p417
JLH A Lifetime In Electronics	J L Hood	June	2000	p480
100W new topology Class B	Russel Breden	June	2000	p486
Speakers Corner: crossover summation	John Watkinson	Sept	2000	p720
Better Buffers: Part 1	Dave Kimber	Sept	2000	p725
Distortion... the facts	Ian Hickman	Oct	2000	p760
Better Buffers: Part 2	Dave Kimber	Oct	2000	p784
Better Buffers: Part 3	Dave Kimber	Nov	2000	p858
2001
Phono Preamp For The CD Era: Part 1	Norman Thagard	Apr	2001	p258
Speaker's Corner: Voltage or Current Drive?	John Watkinson	May	2001	p354
Phono Preamp For The CD Era: Part 2	Norman Thagard	Apr	2001	p356
MOSFET power	David White	Aug	2001	p578
Speaker's Corner: Motional Feedback	John Watkinson	Sept	2001	p698
Output Coil crosstalk	Douglas Self	Oct	2001	p749
Class G: Part 1	Douglas Self	Dec	2001	p900
2002
At this point Electronics World, for reasons unknown, decided to abandon the practice of having page numbers accumulate through the year.
Class G: Part 2	Douglas Self	Jan	2002	p12
Class G Indicator	Douglas Self	Feb	2002	p59
Two Channels- One Gain Pot	Brian Gough	Feb	2002	p61
Capacitor Distortion: Part 1	Cyril Bateman	July	2002	p12
Capacitor Distortion: Part 2	Cyril Bateman	Sept	2002	p16
Tying the Knot- MFB Loudspeaker: Part 1	Jeff Macaulay	Sept	2002	p26
Transparent VI Protection in Amplifiers: Part 1	Michael Kiwanuka	Sept	2002	p46
Capacitor Distortion: Part 3	Cyril Bateman	Oct	2002	p12
Tying the Knot- MFB Loudspeaker: Part 2	Jeff Macaulay	Oct	2002	p46
Transparent VI Protection in Amplifiers: Part 2	Michael Kiwanuka	Oct	2002	p50
Capacitor Distortion: Part 4	Cyril Bateman	Nov	2002	p40
Capacitor Distortion: Part 5	Cyril Bateman	Dec	2002	p44
2003
Capacitor Distortion: Part 6	Cyril Bateman	Jan	2003	p44
Hybrid power amplifier Improved	Wim de Jager	Feb	2003	p46
Audio Power Amplifier Compensation	John Ellis	Mar	2003	p10
Class AB Balanced Audio Line Driver	Wim de Jager	May	2003	p49
Amplifier Input Currents	Douglas Self	May	2003
Capacitor Sounds II: Part 1 Real-Time Hardware	Cyril Bateman	July	2003	p36
Capacitor Sounds II: Part 2 Distortion v Time v Bias	Cyril Bateman	Aug	2003	p46
The Cathode	Patrick Mitchell	Sept	2003	p12
Capacitor Sounds II: Part 3 Distortion Meter	Cyril Bateman	Sept	2003	p46
Noise & Moving-Magnet Cartridges	Marcel van de Gevel	Oct	2003	p38
Flat Wideband Buffers	de Lange	Oct	2003	p19
Capacitor and Amplifier Distortions	Cyril Bateman	Nov	2003	p44
2004
Analogue Switching: Part 1	Douglas Self	Jan	2004
Analogue Switching: Part 2	Douglas Self	Feb	2004
Hybrid Audio Amplifier	Jeff Macaulay	Mar	2004	p48
In Memoriam: John Linsley Hood MIEE	Ian Hickman	May	2004	p17
Precision Rectifier Circuits	Alan Bate	May	2004	p26
Class-A Imagineering: Part 1	Graham Maynard	Jun	2004	p22		Comments
A Simple Class A Amplifier (Reprint from 1969)	J Linsley Hood	Jun	2004	p44
John Linsley Hood Obituaries		Jun	2004	p52
Class-A Imagineering: Part 2	Graham Maynard	July	2004	p16		Comments
Class-A Imagineering: Part 4	Graham Maynard	Sept	2004	p10		Comments
Class-A Imagineering: Part 5	Graham Maynard	Oct	2004	p10		Comments
Simulating Power MOSFETs: Part1	Cyril Bateman	Oct	2004	p22
Class-A Imagineering: Part 6	Graham Maynard	Nov	2004	p10		Comments
Simulating Power MOSFETs: Part2	Cyril Bateman	Nov	2004	p26
Simulating Power MOSFETs: Part 3	Cyril Bateman	Dec	2004	p10
The December 2004 issue was the last with Phil Reed as editor.
2005
The Jan 2005 issue was the first with Svetlana Josifovska as editor.
Simulating Power MOSFETs: Part 4	Cyril Bateman	Jan	2005	p34
Adventure: Noise. (RIAA noise)	Burkhard Vogel	May	2005	p28
Switch-Mode Amplifier Performance Measurements	Bruce Hofer	Sept	2005	p30
2006
The Sound of Silence (MC preamps)	Burkhard Vogel	Oct	2006
Class XD: a New Power Amplifier	Douglas Self	Nov	2006	p20
2007
Hot Audio Power Revisited	Jeff Macaulay	Jan	2007	p48
2008
2009
The Hum Figure	Burkhard Vogel	Mar	2009	p20
Reduce Ear Fatigue In Power Amps	Wangeri Kaguongo	Mar	2009	p24		Comments

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Amplifier Articles in Elektor: chronological order.

An incomplete guide to power amplifier designs in the European magazine "Elektor".

200W Raw Power	anon	Jan 1981
AXL amplifier	anon	Mar 1985
High-Power AF Amplifier	anon	Jun 1986
LFA-150: A Fast Power Amplifier. Pt 1	A Schmeets	Nov 1988
Medium-Power AF Amplifier	T Giffard	Oct 1990
100W High-End AF Power Amplifier	T Giesberts	Mar 1994
HexFET Amplifier Upgrade	T Giesberts	Sep 1995
300W Power Amplifier	A Riedle	Nov 1995
Compact AF Power Amplifier	T Giesberts	May 1997
.
Pax Error-Correcting Power Amplifier: Part1	J Didden	Apr 2008
Pax Error-Correcting Power Amplifier: Part2	J Didden	May 2008

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