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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.


A high quality power supply (voltage) regulator for use with any IC operational amplifier audio preamplifier.
AUDIO AMATEUR 2/1980 [Mar 1980] (v.11#2) pg. 8
Correction AUDIO AMATEUR 4/1980 [Nov 1980] (v.11#4) pg. 63
Added Info AUDIO AMATEUR 1/1981 [Feb 1981] (v.12#1) pg. 10
Added Info AUDIO AMATEUR 2/1981 [Apr 1981] (v.12#2) pg. 58, 62
Correction AUDIO AMATEUR 3/1981 [Jun 1981] (v.12#3) pg. 48
Added Info AUDIO AMATEUR 3/1981 [Jun 1981] (v.12#3) pg. 54
Correction AUDIO AMATEUR 4/1985 [Oct 1985] (v.16#4) pg. 54
Added Info AUDIO AMATEUR 1/1986 [Feb 1986] (v.17#1) pg. 55, 57
Added Info AUDIO AMATEUR 2/1986 [May 1986] (v.17#2) pg. 49
Added Info AUDIO AMATEUR 1/1994 [Mar 1994] (v.25#1) pg. 36

Effect of an imperfect voltage regulator on a simple vacuum tube preamplifier circuit. Looks at how low the regulator's output impedance should be for it to have a negligible effect on the preamp circuit's performance.
AUDIO AMATEUR 2/1982 [May 1982] (v.13#2) pg. 37

Improved power supply for the Hafler DH-101 preamplifier. Reduce output impedance by substituting two external transformers.
AUDIO AMATEUR 1/1983 [Apr 1983] (v.14#1) pg. 33
Added Info AUDIO AMATEUR 4/1983 [Nov 1983] (v.14#4) pg. 57

Tube preamp audio output turn-on delay circuit (14 second delay).
AUDIO AMATEUR 1/1984 [Mar 1984] (v.15#1) pg. 39

A fail-safe muting circuit for preamps. Protect your speakers from high voltages whenever the power switch is turned on or off.
AUDIO AMATEUR 1/1985 [Jan 1985] (v.16#1) pg. 38

Using a solid-state relay allows your preamp to handle the power amp load (up to 40A).
AUDIO AMATEUR 4/1985 [Oct 1985] (v.16#4) pg. 43

A wideband power supply. Positive and negative versions of a clean, stable, and wideband power supply for preamps.
AUDIO AMATEUR 1/1987 [Jan 1987] (v.18#1) pg. 22
Added Info AUDIO AMATEUR 1/1988 [Feb 1988] (v.19#1) pg. 53
Added Info AUDIO AMATEUR 3/1988 [Aug 1988] (v.19#3) pg. 56
Added Info AUDIO AMATEUR 3/1989 [Aug 1989] (v.20#3) pg. 53

Preamp power supply circuits incorporate three-terminal adjustable voltage regulators from Linear Technology Corp.
AUDIO AMATEUR 4/1990 [Oct 1990] (v.21#4) pg. 47
Added Info AUDIO AMATEUR 1/1994 [Mar 1994] (v.25#1) pg. 36
Added Info AUDIO AMATEUR 2/1992 [Jun 1992] (v.23#2) pg. 54

Improving the "soft" power supplies found in most audio preamps. Modifications for a C-9 hologram generator and a Mitsubishi DA-F20 FM tuner.
AUDIO AMATEUR 4/1991 [Oct 1991] (v.22#4) pg. 24

A quick, simple and effective delay-before-operation timer for an existing preamp to prevent switch-on and switch-off thumps. Uses only inexpensive, non-critical components.
AUDIO ELECTRONICS 6/1997 [Dec 1997] (v.28#6) pg. 26

Switching power supplies for tube preamps.
AUDIOXPRESS Apr 2001 (v.32#4) pg. 16
Added Info AUDIOXPRESS Aug 2001 (v.32#8) pg. 84

Soft start for tubes. Build a two-stage slow (40 second) turn-on circuit for audio preamps to prevent vacuum tube damage. Four LEDs show circuit status.
GLASS AUDIO 2/1989 (v.1#2) pg. 1

Improving the vacuum-tube slow turn-on voltage and constant-current heating circuits in preamp and power amp supplies.
GLASS AUDIO 1/1993 (v.5#1) pg. 38

Resurrection for Lazarus. Modifying the Lazarus Cascade Basic preamp with a four-tube design and separate power supply.
GLASS AUDIO 3/1993 (v.5#3) pg. 6
Correction GLASS AUDIO 4/1993 (v.5#4) pg. 39

A quality preamp power supply circuit for driving a replica of Audio Research's SP10 (or SRPP) phono stage. Can be adapted to most vacuum tube preamps.
GLASS AUDIO 1/1995 (v.7#1) pg. 12

Circuit for a positive feedback 100mA voltage regulator that is intended for preamplifiers or as a screen regulator for power amplifiers. Output voltage can be either 250 or 300 volts.
GLASS AUDIO 4/1996 (v.8#4) pg. 64
Added Info GLASS AUDIO 6/1996 (v.8#6) pg. 66
Correction GLASS AUDIO 3/1997 (v.9#3) pg. 54