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2001-02 FEATURES:
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2001-06: FEATURES
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2003-04: VOLUME 34, NUMBER 4; APRIL 2003 FEATURES:
The peculiar evil of silencing the expression of an opinion is, that it is robbing the human race; posterity as well as the existing generation; those who dissent from the opinion, still more than those who hold it. - JOHN STUART MILL
FEATURES:
REVIEWS:
DEPARTMENTS:
2004 (misc): Battery-Powered Class A Headphone Amp (a DIY project) (Jul.) Tube Audio Construction Tips: Transformers (Jul.) High-Quality Moving Magnet (MM) IC Preamp High Power SE 6C33C Amp – A vacuum-tube DIY project --- --- Optocouplers for Audio (Sept.) Selectronic GRAND MOS Silver Design Amplifier (review) (Sept.) Loudspeaker Room Correction, Part 2 (Sept.) Filament and High Voltage Power for Vacuum Tube Electronics --- --- High-Quality Vacuum Tube (aka valve) Control Unit (Oct.) Notes on Musicality and Distortion (Oct.) Steps to Design and Build a Pair of Speakers (Oct.) --- --- Why Power Tubes (valves) Arc (Nov.) ---- ---- Single-Ended to Differential-Mode Vacuum Tube Projects Made Easy (Dec) High-Voltage Differential Amplifier for Measurement Rebuild a Classic Heath’s W-5M Sonic Comparison of Power Amplifier Output vs. Input InterSil D2Audio Class D Audio Modules 2005: Passive Preamp: Transformer Implemented (Jan) DIY Noise Meter Amp project (Jan) --- --- A Shock Hazard Tester (Feb.) A Transconductance Tube Tester Test Standard (Feb.) Loudspeaker: Driver Parameter Assessment Using Transient Capture Analysis (Feb.) Transformers (Feb.) --- --- Starter Kits Series: EB604/410 All-JFET Line Amp (Mar.) Current Source Crossover Filters Build a DIY Music Library Preamp A Simple Audio System, Pt 2: Speakers Product Review, Vifa/Dayton Aluminum MTM Kit --- --- Capacitor Bypassing in Audio Power Supply Circuits: Proceed Carefully! (May) POOGE for eBay/Craig's List Electronics Test Gear (May) A Snail Tail Subwoofer (DIY project) (May) --- --- Electrostatic Loudspeaker Basics, Part 1 (June) All-JFET MM/MC Phono Preamp, Part 1 (June) Tubes--Pentode Petite (June) Load Impedance and Stepped Attenuators (June) Tube Audio Construction Tips, Part 5: Recycling Book Review (Smart Home Hacks--Meyer Review) Speakers--Diffraction Doesn't Have to Be a Problem --- --- -- Speakers--The Wedgehorn (July) All-FET MM/MC Phono Preamp, Part 2 Tubes--Isolator Tube Interface to Computers Electrostatic Loudspeaker Basics, Part 2 Tube Audio Construction Tips Part 6: A Coil Winder --- --- -- Dynaco SCA 80 – update and rebuild (Aug.) Five Speaker Myths Undone (Aug.) A Full Bridge Tube Output Amp (Aug.) Loudspeaker Damping -- Theory + Application (Aug) --- --- -- Nardeux Stereomatic 602 S Vacuum-Tube Amplifier (Sept.) --- --- -- DIY High-Quality Solid-State Headphone Amp (Nov.) Musical Waveform Peak and Average Power Frequency Distributions (Nov.) 2006: An IM Signal Generator Upgrade (Feb) Clamped Bias, AB2, RC Coupled Vacuum-Tube Amp (Feb) Purist Recording Mixer--A high-performance mike preamp/mixer/monitor (Feb.) Selectronic ProFET amplifier review (Feb) Dynaco 400 amplifier upgrade project (Feb) Lowering a Loudspeaker’s Mechanical Noise Floor (Feb) --- ---Stands for Tiny Speakers--a simple, low-cost project (Apr.) Switchable Gain Booster Amplifier (Apr.) A Solid-State Single-Ended Power Amp (Apr.) Mighty Mouse: A PP 25L6 Amplifier (Apr.) Driver Interference and Display Techniques, Pt. 1, Pt. 2 (Apr./May) --- ---Renovating the H.H. Scott 222C vacuum tube integrated amplifier (May) Rehabilitating Cathode Followers (May) 6A87 Current-Balanced Push-Pull Amplifier (May) The ImPasse Preamplifier (May) --- --- -- Two-Transistor MC Phono Step-up (July) 2006 (Sept.):
Economical High-Quality Stepped Attenuators – A DIY project (Oct.) A Tube-based Balanced RIAA Amplifier for Moving Magnet Cartridges – DIY project --- --- --One-Transistor MC Step-up (Nov) A DIY Phase Meter Calibrator (Nov.) Precise dB Monitoring with Eye Tubes 2007: A $450 Triode/Ultralinear Integrated Stereo Amplifier (Jan.) DIY Combination Horn Loudspeaker Project (Jan.) The Cathode Follower and Its Weaker Siblings (Test results confirm that cathode followers are even more capable of driving capacitive loads than equivalent common-cathode amplifiers.) (Jan.) A Unique Loudspeaker Crossover Design with Waveform Fidelity (Jan.) Reliable Audio Engineering via Grounding and System Interlacing (Jan.) --- --- Build a Wide-Range Audio Sweep Oscillator (Feb.) Review of Parasound’s Zamp V3 (Feb.) How Loud Is Real? Why loudness controls never worked (Feb.) --- --- Six-Transistor Ultra Low-Noise MC Phono Preamp (April) A Low-Noise Measurement Preamp (Apr.) De-Noising a Vanilla Pre-amp (Apr.) Speech Intelligibility: What reverb is -- and how to calculate it (Apr.) --- --- Radio Shack Sound Level Meter Characteristics (June) An Analog A/B/I Switcher + Headphone Amp (June) --- --- The GAMP: Adaptable Power for Tube Amps (July) Japanese IC Preamp with Electronic Level and Selector (July) High-End 120W MOSFET IC Driven Amp (July) --- --- The Silent Information Revolution -- Online education challenges traditional paradigms (August) Gamma: A 10-Watt Integrated Amplifier (August) Tweaking the Passive Inverse RIAA Network (Aug.) Calibration of the Hickok 539C tube tester (Aug.) Cascoding National’s LM12 for 140W (Aug.) Optimum Stages for Minimal Distortion (Aug.) --- --- Ultra-Low Distortion Phono Preamp: The LP-797 (Sept.) --- --- A Loudness-Compensated Level Control Stage (Oct.) Monarchy Audio M24 DAC (Oct.) The 6T9 Tube Amplifier (Oct.) The Many Uses of a Hybrid Van Scoyoc Circuit (Oct.) A Hybrid Valve/MOSFET Single-Ended Amp, Part 1 (Oct.) Sounds and Hearing (Oct./Nov.) Intrinsic Fidelity Testing -- Limits of conventional listening evaluations (Oct./Nov.) --- --- A Single-Ended Class-A Hybrid Amp, Part 2 (Nov.) A Mains Analyzer--How Clean Is Your Juice? (Nov./Dec.) 2008: Advantages of Wall Wart Adaptors (Jan.) Audio Tweaks, Mods vs. Science-based Evidence (Jan.) A Hybrid (Tube/Solid-State) High-Fidelity Power Amplifier (Jan.) A Minimalist Audio Amplifier Design (March) Soldering: A Brief Tutorial (March) The G40EP: A Flea-Powered Headphone Amp (Mar) The G40EP: A Flea-Powered Headphone Amp (March) (and how to improve this classic design) Copper Tubing Capacitor Connections (June) Multiple “Wall-Wart” Power Supply for Audio (June) Single-Ended, Vacuum Tube, Class-A Headphone Amp (a DIY project) (Jun.) Upgrading a Belt-Drive Turntable (July) Salvaging vintage audio (electronics) treasures -- from dumpsters, eBay, etc. (July) Buying audio gear on the web: eBay, Craig's List, Audigon, and beyond (Aug) Tips with audio projects using vacuum tubes (valves) circuits: Choosing Cathode Bypass Capacitors (Aug.) AC power methods:
A Beginner 6BQ5 SE Amplifier (Oct.) Class-D amps (Nov.) 2009: Benchmark DAC1 USB [review] (Jan) Tri-Way Low Voltage Supply (Jan) A Chip-Driven SE Monoblock Amplifier (Jan) Balanced Audio Cable Hum: Cause and Cure (May) ezDAC -- A high-performance DIY digital-to-analog processor (May) The Unnecessarily Complex 300B Amplifier (May) Design and Measurement of a Dipole Microphone (Jun.) Improving a Flea-Powered Headphone Amplifier (Jun.) Pre-amplifier design tips (Jun.) Maintaining Your Balance -- A DIY project to handle balanced/unbalanced devices (July) A DIY true RMS audio AC Voltmeter (July) An experimental error-correction power amplifier (Aug.) Regulated Power Supply for Tube Projects (Aug.) PS Audio Digital Link III -- Digital-to-Analog Converter Review of the Pioneer X-Z9 Compact Stereo System 21st-Century Cinema Design--Viewing and listening requirements for a THX-quality theater design. (Sept) Review of Echo Busters Decorative Acoustical Treatments (Sept) Phonograph Groove Jockey -- a unity-gain signal-conditioning module (Oct.) The Noise (Analysis) Machine -- a method to perform accurate noise measurements (Nov.) Distortion Meter – An Audio Interconnect Tester? (Nov.) Interview with the late Professor Malcolm Hawksford (Nov./Dec.) Chassis construction techniques for audio projects (Dec.) An Inductively-Equalized Solid-State Phono Preamp (Dec.) 2010 Jan.: THE SWEET SPOT--This master circuit designer reveals some secrets at the component level to achieving the best possible sound in your audio amps. 15 WATTS PER CHANNEL FOR LESS THAN $150---Our frugal friend presents a tube amp design for first-time builders. BORBELY RIAA with TUBES REVISITED--The author offers a redesign of this popular phono preamp. BURNING AMPLIFIER 2009--DIY audio was alive and well at the third annual BAF. AC FILTER ... AND OTHER NOISY ISSUES--Start at your AC power line for better audio ...and video. GEAR REVIEWS: COMPARING SPEAKERS--This speaker reviewer shares some measurement tips and insights. DEPARTMENTS: EDITORIAL--A New Year TOOLS & TECHNIQUES--The CableCaddy 2011 "Vanishing" Loudspeakers – a DIY project for stereo and THX surround use (Mar.) The Basics of Headphone Testing and Measurements Ultra Low-Noise Phono Preamp [theory, concept, design and DIY project] DIY DAP—A Do-It-Yourself Digital Audio Player: Build an embedded hardware/software system for 16-bit digital audio. The Willowhill Pre-amp -- A high slew-rate JFET pre-amplifier Rebuild an Old Turntable -- A simple circuit and some tinkering allow clean analog sound. All About Speaker Cones -- Let's examine loudspeaker materials, fabrication, and quality Below content adapted from Edward T. Dell, Jr.'s original Audio Electronics / Audio Amateur magazine ...
February 1979 Volume X, Number 1 Contents: Showcase, Gunter Roehricht Guest Editorial, by Neil A. Muncy The Mark I-- A Low Distortion IC Preamplifier / Control Unit, by Michael Lampton and Donald Zukauckas; Listening Tests on the Mark I ---by David Vorhis--A well researched, compact, high performance unit. Issues of Reliability and Validity in Subjective Audio Equipment Criticism, by Lawrence L. Greenhill, M.D. Scientific techniques which might improve listening tests The Warbler, by Dick Crawford---A clever test technique for speakers in rooms The NPQR, Revisited by David Ross -- Further explorations into drone speaker cones Audio Aids, by readers Squires, Hill, Caldwell, Thompson, Winn, Hardwick, Moritko, and White Test Reports : Heath's Continuing Education: Electronic Circuits, by Ronald H. Miller; How to Evaluate Speakers, by Frederick M. Gloeckler, Jr. CORRECTIONS ADs:
Contents Showcase, Editorial Joseph Moritko, Jr. The Advent MPR-1 Microphone Preamp, by Frederick M. Gloeckler, Jr. --A two-channel, transformer input, control-less amp for Advent's 201A A Comparison of Preamplifier Construction Projects, by S. A. Rossmassler--A reader builds four units with helpful tips Direct Cut Myths and Problems, by Adrian Hope--A visit to Teldec, examining prospects for the D-to-D phenomenon. Classic Circuitry: The Marantz 8-B Power Amplifier--Courtesy of E. B. Viotty The Suppression of Surface Noise, by D.T.N. Williamson--A classic which laid down constraints for all today's quieting systems. Soldering: The Basics, by Marc Colen--A thorough, enlightening primer on a vital topic Audio Aids: by readers Davidson, LeBeck, Sellman, McIntyre, and Philpot Test Reports: Heath's ID 5252 Audio Load Heath's IG 1275 Sweep Generator LETTERS (with CORRECTIONS)
Volume 10, Number 4 October 1979 Contents Showcase--Leach and Jung turned out under a craftsman's hand; Editorials The Williamson 40/40, Power Amplifier--Return of an improved favorite after a decade Conversations with Peter Baxandall; Part 1--A visit with the designer of those fed back tone controls The Saga of Golden Ear and Meter Reader--Psychological distortions in the human as measuring device, by Rod Rees and Ron Shaffer A Power Meter---LEDs give better peak power clues than a needle in motion Location Recording Basics, by William F. Ruck, Jr. Audio Aids---On Heils, ladders, head leveling and Zeners. Kit Report: The Integrex Dolby Noise Reducer, by Fred M. Gloeckler, Jr. Test Report: The Jung-White PAT-5/WJ-1A, by David Vorhis. The Grounded Ear--What dbx is up to with discs, PML's mike, and Sony tape Classic Circuitry
Volume 11, Number 1 January 1980 Contents: Showcase-- Electrostatics and horns complement a fine system, Barry Waldron Editorial--The Post, Parcels and Priorities A Family of Power Amplifier Power Supplies -- A versatile circuit for regulated DC in quantity, by James E. Boak A Dynamic Range and Clipping Indicator-- What's really going into your power amp's input? by David White A High Accuracy Inverse RIAA Network -- New light and hardware for the phono curve's basic shape, by Stanley P. Lipshitz and Walt Jung Conversations with Peter Baxandall: Part II Opinion from a distinguished British engineer/audiophile Are Those Ears Really Golden? (Or only Iron Pyrites?) -- Extensive explorations of whether listeners detect differences in equipment, by Thomas H. Smith, Michael R. Peterson and Peter O. Jackson Audio Aids--On Phono arm geometry, turn-on/off noise, and zener size, by readers Goodman, Shults and Grandfeldt Test Report: Listening tests of the PAT-5/WJ-1A, by Laurence L. Greenhill, M.D. Book Reviews: ABC's, FM and basic resources by Ron Miller. TTL, and two on Recording by Jim Boak, Dick Kunc and Walt Jung Recordings Review, by editors Williamson, Gloeckler and Boak Classic Circuitry--The McIntosh C-22 preamplifier CORRECTIONS / LETTERS to the Editor
One / 1989: About this issue: --- --- --- --- --- --- --- --- Stuffed is the only word that will describe the quantity of information in this first 1989 issue. If you'd like to watch the data on what your CD plays, a used Apple plus Peter Khoury's board and soft ware will monitor and operate your new music source. Our Danish amp expert Hans J. Klarskov Mortensen has developed a 150W/channel hybrid you will enjoy building and adding to your system (page 14). Randy Vikan supplies all the instructions needed to build his power amp for your car starting on page 21. Tom Howe has done a new realization of Dick Marsh's very popular preamp (TAA 3/80) starting on page 29. Ken Beers decided that the Pooge-4 mod for the Magnavox/Philips players (TAA 1, 2/88) could be done with out circuit cards and has shared his instructions and drawings starting on page 38. Don't miss Contributing Editor Galo's review of a new pair of CD test discs (p. 42) and his 'Ask TAA ’ column beginning on page 46. Hamp Childress reviews an interesting ‘mixed source ’ CD player from ADCOM starting on page 43. And be sure to see the helpful contributions from Richard Painter, Vincent Mogavero and Matthew Jurick on page 49. --- --- --- --- --- --- --- --- --- --- ARTICLES: APPLE II STEREO REMOTE CONTROL, By Peter Khoury THE DC300B TUBE MOSFET AMP, By Hans J. Klarskov Mortensen RVK car amp (part 2), By Randolph Vikan STRETCHING MARSH'S PREAMP, By Thomas Howe DIRECT MODS FOR THE MAGNAVOX CDB-560, By Kenneth Beers DEPARTMENTS: REVIEWS By Gary Galo TEST REPORT, By Hampton Childress ASK TAA By Gary Galo AUDIO AIDS By Richard Painter, Vincent Mogavero, and Matthew Jurik
Two / 1989: ARTICLES A MULTI-TONE INTERMODULATION METER, PART 1, By Erno Borbely THE DC-300BC--TUBE MOSFET AMP, PART II, by Hans J. Klarskov Mortensen A TAPE CALIBRATION OSCILLATOR, By Reg Williamson A SIMPLE HIGH-QUALITY CD OUTPUT AMP, By Jan Didden AC SENSING CONTROL, By LB. Dalzell DEPARTMENTS EDITORIAL Bags & Taxation BOOK REVIEWS, Gary Galo and Rod Rees TEST REPORT, By Fernando Garcia Viesca JUST LOOKING (new products)--LETTERS to the Editor
ARTICLES: DIGITAL GAIN CONTROLS, By Fernando Garcia Viesca A MULTI-TONE INTERMODULATION METER, PART II , By Erno Borbely FINE TUNING YOUR FORD, By John Buschmann STEPPED VOLUME CONTROLS, By Joseph O'Connell DEPTS: EDITORIAL Catch-Penny CD (2), By Gary Galo AUDIO AIDS, By Edward Aho CD REVIEWS, By John Sunier JUST LOOKING CLASSIC CIRCUITRY--Grommes G101 Power Amp
Four / 1989: About this issue: Help is arriving for those of you with 14-bit Magnavox CD machines in John Allgaier's continuing safari through that quadrant of the digital jungle (p. 8). Ronald Bauman, aware of the supposed pit falls of feedback, began an extended study of an older form of error correction called feedforward, an exotic concept used in few audio devices to date. His series, beginning on page 15, will appear at intervals. If anyone had told me I would agree to publish a return to the old PAT-4 plat form, I would have considered them ready for therapy. But when the surgeon is a Tom O'Brien and what remains of Dynaco's worst lemon is mostly the knobs, switches and the case, then the prospect (p. 22) becomes positively delicious. At the other end of the reputation spectrum ADCOM's GFA-555 is well regarded by many. Kit Ryan was unhappy enough with his to devise a way to regulate its voltage supply (p. 34) and implement it with satisfying results. A rich assortment of four Audio Aids begins on p. 46 and Contributing Editor Gary Galo reviews several basic books, a neat circuit board fabrication aid, and answers readers' questions in his Ask TAA column (p. 41). John Sunier of the popular radio show, Audiophile Auditions, is also present with a rich offering of CD and cassette reviews (p. 51). Erno Borbely's series on distortion is on hold pending completion of extensive op amp evaluations. -E.T.D. Contents: 1. Just looking 3. Feed Forward Error Calibration 4. TIME LORD (Ad) 5. The Dynaco PAT 4 Preamp Reborn 6. A Power Supply Regulator For The Adcom GFA-555 7. Pearl -- Hand Builders of Precision High Fidelity Equipment (Ad) 8. Ask TAA 9. GSI (ad) 10. AUDIO AIDS 11. Reviews: REISSUE PROJECTS, etc. 12. SHOWCASE: BORBELY PREAMPLIFIER 13. Letters (mail)
A New Outboard DAC: Part 1; By Hank Z. The Dynamic Range Potential Of The Phonograph; By Ronald B. Home Theater--A Playground For The Audio Amateur: Part 2; By David C. Book Report: Digital Projects for Musicians; Reviewed by Bill F. Just Looking Audio Aids: Capacitorless CD Output; Taming CD Stridency Letters (mail, email and feedback) Showcase; By Irving F.
Content: ARTICLES: A Case Study in Audio Amp Design: Part 4 DEPARTMENTS: EDITORIAL -- By Edward T. Dell, Jr. GUEST EDITORIAL -- By Gary Galo PRODUCT REVIEW -- HHB Compact Disc Recorder KIT REVIEWS: Marchand PR41 Passive Preamplifier AUDIO AID Resins for Loads -- By Mark L. Sanfilipo JUST LOOKING LETTERS 2000-03: Content: On The Mechanics of Tonearms, Part 1 A Case Study in Audio Amp Design: Part 5 DEPARTMENTS PRODUCT REVIEWS BOOK REVIEW--Elektor 300 Circuits AUDIO AID What's a VU? JUST LOOKING IN EVERY ISSUE 2000-04: Content: About this Issue JUST LOOKING EDITORIAL--My Test Tracks Improved Positive/Negative Regulators The Mechanics of Tonearms -- Part 2: Effective Mass A CASE STUDY IN AUDIO AMP DESIGN: THE A40M, PART 6 PRODUCT REVIEW A DSO Trio, Part 2 PRODUCT REVIEW--CD Repair Kits Pass Thagard A75-- Calgary Version BOOK REVIEW--The Joy of Audio Electronics LETTERS NEW CHIPS ON THE BLOCK--BURR-BROWN INA148
MAIN ARTICLES: Upgrading Monarchy's Converters and Amplifiers DEPARTMENTS: PUBLISHER ANNOUNCEMENT LETTERS PRODUCT REVIEWS: Monarchy Audio SM-70 and SE-100 Delux Power Amplifiers A DSO Trio, Part 3 NEW CHIPS ON THE BLOCK
ABOUT THIS ISSUE: Is distortion ruining the pleasure of listening to your favorite musical recordings? L. Mirabel dramatically enlarged his record library with this treble distortion filter circuit. He also expands this filter design into a complete room equalizer ("Filter for Treble Distortion" ). Add Mark Rehorst's simple circuit module to your PC board for dual voltage supplies ("Dual Voltage-Regulator Module"). Time and again, author Gary Galo has shown how a simple circuit modification can pay big dividends. This time around, his fix to an outboard phono preamp addresses an unusual power-supply configuration and improves the sound of the unit ("A Simple PP-1 Mod"). Regular contributor C. Hansen shows you how to build a piece of test equipment for measuring audio units with balanced inputs or outputs ("An Audio Balun"). Circuit guru Michael Kornacker reworks a traditional voltage-doubler circuit for use in his own configurations. Add his designs to your own circuit library ("Voltage-Doubler Circuits"). Jensen Transformers has released several products that are helpful in over coming grounding problems in your audio/video applications. Charles H. and Ed Dell tell you how they perform ("Product Review"). Thumbs up or thumbs down? Review editor Gary A. G. previews the latest in digital design kits from The Parts Connection ("Kit Review"). We kick off our AE Test Tracks column with some recollections from music fan Philippe Trolliet of Montreal. Content: A Filter For Treble Distortion In Recordings Assemblage DAC 2.6 and DAC-3.0 IN MEMORIAM NEW CHIPS ON THE BLOCK-- Linear Technology LT1468 TEST TRACKS Speaker Builder magazine (1980-2000)
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