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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.


Measuring crossover or notch distortion (the result of discontinuous operation of a push-pull, Class B amplifier when the signal makes the transition between "positive" and "negative").
AUDIO AMATEUR 4/1975 [Mar 1976] (v.6#4) pg. 34

Slewing induced distortion (SID) in audio amplifiers. Part 3. Transient intermodulation tests for SID.
AUDIO AMATEUR 3/1977 [Aug 1977] (v.8#3) pg. 21

Slewing induced distortion (SID) in audio amplifiers. Part 4. Listening tests for SID.
AUDIO AMATEUR 4/1977 [Dec 1977] (v.8#4) pg. 22
Added Info AUDIO AMATEUR 1/1978 [Mar 1978] (v.9#1) pg. 63, 65, 66, 67

An audio measuring system. Part 3. Two-tone IM (intermodulation) distortion tests of a power amplifier. Circuits included for constructing a filter set for use with a signal generator and meter to conduct the tests.
AUDIO AMATEUR 1/1982 [Jan 1982] (v.13#1) pg. 10
Correction AUDIO AMATEUR 2/1982 [May 1982] (v.13#2) pg. 50

A new test for preamps and amplifiers is proposed. Involves using white noise coupled with a very narrow and deep tunable notch filter.
AUDIO AMATEUR 1/1982 [Jan 1982] (v.13#1) pg. 58

Some amplifiers do sound different. A case study of two amplifiers proven to sound different. Example of a double blind listening test which revealed something not visible through bench testing.
AUDIO AMATEUR 3/1982 [Aug 1982] (v.13#3) pg. 30
Added Info AUDIO AMATEUR 5/1982 [Jan 1983] (v.13#5) pg. 55

Avoiding amp clipping. How to use a test CD to adjust your separate audio preamp and amplifier to avoid clipping.
AUDIO AMATEUR 4/1993 [Dec 1993] (v.24#4) pg. 35
Added Info AUDIO AMATEUR 3/1994 [Sep 1994] (v.25#3) pg. 50

Low-cost analog meter for displaying measurements made with a multi-tone intermodulation meter (a test device that uses two audio signals to exercise static nonlinearities in an audio amplifier). Est. cost: $25.
AUDIO ELECTRONICS 2/1998 [Apr 1998] (v.29#2) pg. 28

THD is meaningless. An RF amplifier designer argues that total harmonic distortion (THD) figures are irrelevant, irrational, and completely spurious. Part 1.
AUDIOXPRESS Jan 2001 (v.32#1) pg. 36
Added Info AUDIOXPRESS Aug 2001 (v.32#8) pg. 73

THD is meaningless. Part 2.
AUDIOXPRESS Feb 2001 (v.32#2) pg. 54

Build a reactive load to test the behavior of amp designs. This 4-ohm design combines a resistive, inductive, and capacitive load all in one unit.
AUDIOXPRESS Aug 2003 (v.34#8) pg. 48

The SOAP (Safe Operating Area Power) factor. Check your power amp's performance with this handy method to estimate clipping power by measuring the quiescent DC supply.
AUDIOXPRESS Oct 2003 (v.34#10) pg. 28

Stereo speaker simulator permits you to silently test stereo amplifiers and outputs up to 20 watts per channel.
ELECTRONICS ILLUSTRATED Jul 1965 (v.8#4) pg. 57

Test equipment for audio technicians. Part 2. Balanced-line converter which allows consumer-audio gear to be connected to professional amplifiers.
ELECTRONICS NOW Dec 1999 (v.70#12) pg. 41

Testing the circuit of a hi-fi amplifier with the square-wave audio oscillator and oscilloscope.
ELEMENTARY ELECTRONICS Sep-Oct 1966 (v.3#1) pg. 43

Amplifier loads for testing. One way to achieve a non-inductive load for testing tube amplifiers.
GLASS AUDIO 1/1990 (v.2#1) pg. 10

How to measure audio amplifier output impedance (which varies as loudspeaker impedance varies).
GLASS AUDIO 5/1995 (v.7#5) pg. 50

The amplifier distortion story. Part 2. How to measure distortion and how to avoid its effects.
GLASS AUDIO 1/1996 (v.8#1) pg. 26

Quality testing for audio amplifiers. How to check power output, distortion, and frequency response using an oscilloscope, audio generator, and voltmeter.
GLASS AUDIO 4/1996 (v.8#4) pg. 30

Test equipment for amps. Some simple techniques and gadgets you can employ to test tube amplifiers. (1) Plate-kick meter. (2) Grid-kick meter. (3) Four-part distortion meter. (4) Plotting an amp's characteristics on graph paper. (5) Signal injection.
GLASS AUDIO 1/2000 (v.12#1) pg. 44

Audio amplifier specifications. How measurement standards are used to obtain performance specifications.
MODERN ELECTRONICS [2] Jan 1986 (v.3#1) pg. 41

Technique for calculating input and output impedances of audio amplifiers.
POPULAR ELECTRONICS [1] Jun 1969 (v.30#6) pg. 69

Understanding "dynamic headroom", a new addition to the Institute of High Fidelity amplifier measurement standards.
RADIO-ELECTRONICS Dec 1978 (v.49#12) pg. 53

Headroom test generator. Test accessory will indicate how much undistorted power your hi-fi amplifier can deliver above its continuous power rating.
RADIO-ELECTRONICS Oct 1979 (v.50#10) pg. 96

Can you hear the difference? Part 1. A look at the real or imagined audible sonic differences between different hi-fi amplifiers.
RADIO-ELECTRONICS Aug 1988 (v.59#8) pg. 75

Can you hear the difference? Part 2. Test techniques to reveal audible sonic differences between different amplifiers. An introduction to the Hafler difference-signal (differential) test.
RADIO-ELECTRONICS Sep 1988 (v.59#9) pg. 79

Audio-amplifier damping factor (DF). What it is, how to measure, impact on loudspeakers, etc.
RADIO-ELECTRONICS Jan 1989 (v.60#1) pg. 78

Testing the amplifier/loudspeaker interface. Build a special waveform generating circuit which drives the amplifier's protection circuits into current limiting. The result is displayed on an oscilloscope.
SPEAKER BUILDER 5/1988 [Sep 1988] (v.9#5) pg. 9
Added Info SPEAKER BUILDER 6/1988 [Nov 1988] (v.9#6) pg. 47