Linear Audio USB stick

Now available as a fully searchable PDF collection – the Linear Audio USB stick!

See this page for details and ordering info.

Image
Linear Audio USB stick

Linear Audio Volumes

Available at Amazon

Image

In his series of articles on error correction (EC) applied to audio amplifiers, the author has sh

Image

Rudolf has published earlier articles in Linear Audio related to finding the lowest distortion so

Image

This article covers a simple modification that overcomes most of the tricky thermal stability iss

Image

In this brief article authors Groner and Putzeys discuss nonlinear distortion in reed relays.

Image

One of the problems in traditional speakers concerns the off axis response of the tweeter.

Hit by a surprising noise production mechanism in his previously published the Amp2 signal-to-noi

Image

Despite the increasing popularity of gramophone records, many recordings are still only distribut

Available at Amazon

Image

Mu Followers and Mu Stages have been available to the audio community for some time.

Image

If there is a question in audio without a convincing answer, it is certainly the one about the wa

Image

This amplifier design is, as the American expression says, “well off the beaten path”.  It does n

Image

There are numerous designs and many commercially available Phono Preamps on the market, but there

Image

This article deals with audio power amplifier power supplies with sine wave current absorption, s

Image

‘Rumble’ is actually not a very accurate description.

Image

This article considers the measurement of harmonic distortion in capacitors using a bridge circui

Image

In recent times the audio and consumer media seem to have latched onto the term High Definition o

Image

With this book, the author succeeded in convincing me that for loudspeakers, current drive is, in

Image

Morgan Jones' conclusion after a thourough review:  “The Art of Electronics” 3rd Ed.

Image

Douglas Self's  artcle on differential rumble cancellers (vol 10) provoked Marcel van de Gevel to

Available at Amazon

Image

If you have available the last edition of Audio Power Amplifier Design and Small Signal Audio Des

Image

As Stuart notes, the circuit concepts in this book integrate several ideas in a synergistic way,

Image

Gary’s interest in RIAA equalization for displacement-sensitive phono cartridges has been piqued

Image

Hans Polak read with great interest Giovanni Stochino’s articles addressing active feedback and e

Image

Hans Polak very openly communicated his doubts on some issues in Giovanni’s Error Correction arti

Image

In a paper published in Electronics World and Wireless World in September 1994 Douglas Self gave

Image

There are many types of volume controls, from simple potentiometer to transformers (autotransform

Image

This investigation grew out of a letter that was published in HiFi News at the end of 2015, where

Image

Among tube designers, the cathode follower is always subject to debate.

Image

Eugene Dvoskin needed a pair of high performance voltage regulator to provide very clean power to

Image

Burkhard Vogel had an article in  the fifth Linear Audio (Vol 4) about calculating the noise prod

Image

It is often said that the listening room should be considered in the same way as any other compon

Image

Bill Waslo has been impressed with what acoustic diffusion does in audio systems.  In his view, p

Image

It is fair to say that most hi-fi enthusiasts have paid little attention to the importance of the

Available at Amazon

Image

Few people will disagree that the strict technical performance of the vinyl LP audio reproduction

Image

Stan Curtis reflects on many decades of experiences with powering audio equipment.

Image

Gary Galo reviews ‘Vinyl – The Analogue Record in the Digital Age’ by Dominik Bartmanski and Ian

Image

Morgan Jones reviews ‘Grounding and Shielding, Circuits and Interference’ by Ralph Morrison.

Image

In Linear Audio Volume 0, Frank Blöhbaum proposed an interesting circuit for use with pentodes, w

Image

When tinkering with your turntable have you ever wondered what anti-skating, effective tonearm ma

Image

In this short Guest Editorial,  AudioXpress’ Editor in Chief Joao Martins reflects on the continu

Image

Hans Polak used to strictly adherence to the XLR ‘pin 1’ connection rules in his fully balanced a

Image

Scott Wurcer noticed that, when playing records, the signal often gets digitized on its ultimate

It is well known that when a transistor is set up such that the Vce, Ic and power dissipation do

Image

In linear power supplies with solid state rectifiers, the diode switch-off transient generates a

Image

We can very easily design RIAA phono and line preamplifier circuits with solid state devices such

Image

A tapped horn is a speaker design, where the horn is folded and the transducer is placed in a baf

Available at Amazon

Image

In this second part, Stochino presents and discusses the results of his recent investigations and

Burkhard Vogel set out to rectify some shortcomings of his Phono Engine I which was presented in

Image

Your editor took out some time to get back to the lab table and look into that question of ‘therm

Image

Our regular contributor Stan Curtis wonders why the hi-fi world does tend to stick with what it k

Image

Bob Cordell is an experienced user of the free Spice simulator from Linear Technology, LTspice.

Image

In his review of Douglas Self’s 2nd edition of Small Signal Audio Design, Jean-Pierre

Image

When Rudy van Stratum decided to clean his attic and decided to remove stacks of decades-old audi

Image

Cyril’s capacitor article series in Electronics World, a few decades ago, were a landmark in our

Image

All electronic components have defined boundaries of operation where they can be expected to oper

Image

In this article, the authors introduce the design of a power amplifier with only three necessary

Available at Amazon

Image

The Equal Opportunity - A Balanced Moving Magnet Phono Stage (Part 2)    Vol 8

Image

Multiplied Transconductance Amplifiers – part 2: high power amplification  Vol 8

Image

The Art and Science of the Audio Review                 Vol 8

John Atkinson

Image

Gramophone preamplifier noise calculations – the 3852 Hz rule revisited      Vol 8

Image

A Cube-law audio power amplifier – class-A at ¼ the idle dissipation           Vol 8

Size does matter. Or does it?         Vol 8

Stan Curtis

Image

On Digital Audio Formats and the Nyquist – Shannon sampling Theorem      Vol 8

Image

As often happens, when Giovanni Stochino started planning for part 2 of his error correction seri

Image

The Otto Schade Method – A practical design method for rectifier circuits     Vol 8

Image

The uTracer V3.10 – a curve tracer for valves     Vol 8

Morgan Jones

Sound Reproduction: The Acoustics and Psychoacoustics of Loudspeakers and Rooms - Floyd Toole Vol

Available at Amazon

Image

Building Valve Amplifiers, Morgan Jones Vol 7 Marcel van de Gevel Marcel van de Gevel checks out

Image

In a previous column, Stan Curtis has discussed his observation that between implementations in b

Image

In his Guest Editorial, Joachim Gerhard gives a very personal rendition of his many years of sear

Image

 When Barrie Gilbert turns his mind to an area of design, expect the unexpected.

Image

George Ntanavaras wanted to design some simple speakers for his surround system.

Image

Every audio designer finds himself eventually in the situation that he needs a very low noise pre

Image

Recent investigations and developments related to feedback and feed-forward error correction (Par

Image

The Equal Opportunity - A Balanced Moving Magnet Phono Stage (Part 1) Vol 7 Stuart Yaniger Not ju

Image

David Zan David Zan makes good on his promise in the previous issue's Guest Editorial.

Image

Douglas Self approaches 'RIAA optimization' from an unexpected slant: which circuit configuration

Image

Drawing on decades of research and experiments, Malcolm Hawksford reviews the most often encounte

Image

Overwhelmingly, serious music listing is done through speakers and much less through headphones.

Available at Amazon

Image

Controlling the quiescent current in class AB output stages has long been the Achilles heel of su

Image

Hannes Allmaier likes to design phono preamps because of the interesting mix of conflicting requi

Image

Static Induction Transistors are solid state devices that have triode-like characteristics.

Image

David Moran noticed that the Infinity P362, a decade old speaker design which is still favored by

Stan Curtis relates how he noticed that there was often an audible difference between his ratsnes

Image

Audio Power Amplifier Design, 6th ed.

Image

In his Guest Editorial, David Zan argues that almost all power amplifier designs have gyrated to

Image

Bob Cordell explored power amp compensation techniques that allow the designer to employ more fee

Image

In his earlier article, Robert Munnig Schmidt described a subwoofer system with an electronic sol

Image

Hans Polak noticed that the noise specifications of RIAA preamps are often given in units and ope

Image

Noise in audio circuits hampers the ability to listen to low level details in the signal.

Image

In the heydays of AM radio receivers some tubes were produced having up to 6 grids, called octode

Image

Although Erno Borbely must have designed a dozen or more phono preamps, he never tires of trying

Available at Amazon

Most of us agree that the aim of good hi-fi is to re-create the sounds heard in the control room

Image

When the small "bookshelf" loudspeakers became popular some 30 - 40 years ago, they established a

Image

The development of artificial reverberation in the audio industry has been aimed at duplicating t

Image

In 1996, Douglas Self published a design for what became known as the Precision Preamplifier, whi

Image

In his search for a good sounding headphones amplifier, Rob Scheepens has experimented with, and

Image

Bruno Putzeys maintains that one of the causes for many, many ground problems in audio is the (su

Image

An Archival Phono Preamplifier is a phono preamplifier designed for playback of vintage recording

Image

The introduction of the "high resolution" digital formats for the recording of sound has initiate

Image

In a previous article (Linear Audio Volume 0), Pierre investigated audio transformers as magnetic

Image

Morgan Jones Look inside almost any piece of commercial equipment having a linear power supply an

Image

Erik Margan has long realized that a cable is a potential source of trouble interconnecting two o

Oliver Masciarotte; To Serve and Groove     Vol 5

Stuart Yaniger

Available at Amazon

The case for subjective Listening Tests Hans van Maanen In his Guest Editorial, Hans van Maanen a

Image

Inspired by Nelson Pass' work with Static Induction Transistors, and Lennart Jarlevang's  experie

Image

After spending many years to write an encyclopedic tome on audio power amplifier design, Bob Cord

Image

Power supply regulators for low power audio circuits have always been a source of controversy.

Image

Les Bordelon has been building renowned designer and author Erno Borbely's designs for many years

Image

Lennart Jarlevang gets his hands on the best of two world: a pair of massive single-ended transfo

Image

Static Induction Transistors are remarkably like triodes, both in electrical characteristics and

Image

Standard THD measurements give a clear indication of amplifier linearity for the signals with whi

Image

Burkhard makes the observation that the audio designer, when it comes to noise performance of his

Image

Since noise is always a very important factor in phono preamp designs, Marcel gives it much atten

Image

In this installment of his regular The Way I see it column, Stan Curtis makes the point that the

Image

Operational Amplifier Noise - Techniques and Tips for Analyzing and Reducing Noise Ovidiu Popa Ov

Available at Amazon

Many class-A amplifiers are placed in a largish enclosure with heatsinks that ‘look about right’.

Image

Book review Burkhard Vogel The Sound of Silence (2nd edition) Popa Ovidiu Popa's expertise on low

Image

Book review Morgan Jones Valve Amplifiers (4th edition) Yaniger Our resident tube book reviewer S

Image

No lab or hobby shack should be without a preamplifier to measure very low signals with very low

Image

Dr. Ramaswamy is back with another usefull piece of lab equipment.

Image

Professor Robert Munnig Schmidt teaches Mechatronics at one of Netherlands prestigious universiti

Image

Ruschkowski got inspired by his friend Erno Borbely (who should not need any introduction) to des

Image

Part I of this article appeared in Linear Audio Vol 1 in Spring 2011 and readers have been asking

Image

If you are looking for that ultimate headphone replay amplifier, you couldn't do any better than

Image

Digital Interpolation is a way to reduce complexity and requirements for post-DAC analog filterin

Audible tweaks that cannot work Vol 3

Richard Burwen

Image

With all our focus on individual designs and equipment and trying to improve our amps and speaker

Image

Steven van Raalte set out to combat the resonance in phono cartridges.

Available at Amazon

Image

In Linear Audio Vol 0, Nelson Pass paid tribute to the classical single-ended transformer-coupled

Image

In The C70 KT-88 Vacuum Tube Stereo Amplifier, Bob Cordell shows he is equally well versed in tub

Image

In this article, Kendall presents a solid state unity-gain power output stage that has very low d

Image

Testing One, Two, Three..

Image

This article has been inspired by previous work by LC Audio, Leach and Nelson Pass.

Image

Active filter stages having two (usually complex) poles and two (usually complex) zeroes can be v

Image

TWhen Rudolf Moers discovered tube amplifiers, he could not find a good book that explained vario

Image

Book review - The Design of Active Crossovers by Douglas Self Castor-Perry Kendall (aka The Filte

Image

Book review - Fundamental Amplifier techniques for Electron Tubes by Rudolf Moers Vol 2

Guest Editorial - Digital Audio: Progress, Stagnation and Regression Gary Galo Gary offers an ins

Image

In this article Samuel reviews existing transimpedance stage configurations, and then introduces

Available at Amazon

Image

Audiophiles are often told that their new equipment, components or cables need to be 'broken in'

Image

Low noise input stages are widely used in audio equipment, in particular for Moving Magnet (MM) a

Image

Discussions on (audible) differences between types of passive components like resistors range far

Image

Feedback is at once a basic subject in engineering and a remarkably polarizing one in audio with

Image

Scott Wurcer provides an in-dept analysis of what it takes to build a state of the art mic preamp

Image

For loudspeaker design and prototyping you'd want a simple, flexible system to play' with the cro

Image

In L|A Vol 0 Jean-Claude described the development of the P21 mid-high satellites with optional p

Image

It is well known that Class-A gives the best sound quality in audio power amplifiers but the effi

Image

Project21, described elsewhere by Jean-Claude Gaertner, needed a flexible level control system fo

Letter to the Editor Dave Kimber and Burkhard Vogel.

Letter to the Editor Peter van Willenswaard Peter van Willenswaard comments on Stuart Yaniger's a

Letter to the Editor Burkhard Vogel Burkhard Vogel comments on two articles in Vol 0: Frank Blöhb

Image

Large-value electrolytic capacitors are an easy solution to keep DC offset out of low-impedance s

Adventures of a diy-audio-addict Rudy van Stratum Rudy describes his adventures from a consumer-w

Image

Book review - High End Valve Amplifiers by Menno Vanderveen Vol 1

Stuart Yaniger

Image

Book review - Designing Audio Power Amplifiers by Bob Cordell Jean-Pierre Vanderreydt Jean-Pierre

Available at Amazon

Vol 0 Which was your first single?

Image

Vol 0 Down the Rabbit Hole - Adventures in the Land of Phonostages Joachim Gerhard When prolific

Image

Vol 0 The IC notebook Ed Simon If, like Ed Simon, you have more different IC's than you can keep

Image

Two things define the distortion performance of a power amplifier; the open-loop linearity of the

Image

Project 21 is an extensive project consisting of a satellite two-way with a bass enclosure.

Vol 0 - Split the Difference: The Truth about the Humble Cathodyne.

Stuart Yaniger

Image

Vol 0 Book review Andy Bryner Andy reviews Douglas Selfs' latest book, "Small-signal Audio Design

Vol 0 From the editors desk Jan Didden Why would anyone in his right mind start an audio publicat

Image

This article is available on-line for free!

Image

Ari has been publishing his DC-coupled, Modulating Bias design as the Simplex amplifier.

Image

The problems with stereo sound reproduction start already at the recording end of the signal chai

Image

Audio equipment has become so transparent that it taxes the resolving power of all but the most e

Image

In the tube world, it is taken for granted that if you want a low noise amplifier you don't use a

Image

Leakage inductance is caused by that part of the primary flux that doesn't make it to the seconda

Image

Tom Nousaine exposes some myths about low frequency reproduction in home listening rooms.

Image

Vol 0 Book sneak preview Jan Didden Bob Cordell's Magnus Opus 'Audio Power Amplifier Design' was