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Linear Audio USB stick

Linear Audio Volumes

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

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

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

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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

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

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

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

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

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

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

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

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‘Rumble’ is actually not a very accurate description.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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The Art and Science of the Audio Review          &nb

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Gramophone preamplifier noise calculations – the 3852 Hz rule revisited     

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A Cube-law audio power amplifier – class-A at ¼ the idle dissipation     &nbs

Size does matter. Or does it?         Vol 8

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

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

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

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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

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Audio Power Amplifier Design, 6th ed.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Audible tweaks that cannot work Vol 3

Richard Burwen

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

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

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

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

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

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Testing One, Two, Three..

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

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

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

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

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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

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

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

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

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

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

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

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

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

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

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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

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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

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

Stuart Yaniger

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

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

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

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

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

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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.

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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

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This article is available on-line for free!

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

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

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

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

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

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

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

Vol 0 Which was your first single?