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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.


Tip on using automobile batteries as a ripple-free heater supply for tube circuits.
AUDIO AMATEUR 2/1983 [Jun 1983] (v.14#2) pg. 62

A high-voltage, low-impedance power supply and voltage regulator for vacuum tube circuits.
AUDIO AMATEUR 2/1984 [May 1984] (v.15#2) pg. 25
Correction AUDIO AMATEUR 3/1985 [Jul 1985] (v.16#3) pg. 51
Added Info AUDIO AMATEUR 2/1986 [May 1986] (v.17#2) pg. 47

Vacuum tube heater regulator. A look at the causes of tube failure and a tube-saving circuit.
AUDIO AMATEUR 3/1987 [Jul 1987] (v.18#3) pg. 19
Added Info AUDIO AMATEUR 4/1989 [Oct 1989] (v.20#4) pg. 58

Vacuum tube circuit to combine the advantages of both auto bias and fixed bias voltage.
AUDIOXPRESS Feb 2001 (v.32#2) pg. 88

Direct-coupled circuits need regulated DC heaters.
AUDIOXPRESS Mar 2001 (v.32#3) pg. 86
Added Info AUDIOXPRESS Apr 2003 (v.34#4) pg. 72 (Current-regulated heater supplies).

A safe power supply for valves. This power-supply design ensures extended tube life and user safety.
AUDIOXPRESS Apr 2002 (v.33#4) pg. 26

Direct heaters. A guide to help decide which scheme to use in applying power to vacuum-tube heaters.
AUDIOXPRESS Jan 2003 (v.34#1) pg. 28
Added Info AUDIOXPRESS Aug 2003 (v.34#8) pg. 67

How to salvage the DC to DC inverter circuit found in disposable flash cameras and use it in the power supply for tube amplifier projects.
AUDIOXPRESS May 2003 (v.34#5) pg. 46

Free filament and bias voltage. Circuit which uses the filaments of the preamp tubes in place of a high-wattage cathode resistor to feed the output tubes.
AUDIOXPRESS Oct 2003 (v.34#10) pg. 68

Long life for your amplifier tubes. Simple circuits used to control vacuum tube voltage levels will help prolong their life.
CQ. THE RADIO AMATEUR'S JOURNAL Jan 1991 (v.47#1) pg. 68

Screen overcurrent protection. Considerations in designing a power amplifier (which uses tetrodes or pentodes) to prevent damage to expensive vacuum tubes.
DX MAGAZINE Jan 1992 (v.4#1) pg. 12

Extending tube life. Hints look at filament voltage, filaments in series-parallel, application of B+ voltage, and power tube heaters.
GLASS AUDIO 2/1989 (v.1#2) pg. 16
Added Info GLASS AUDIO 1/1990 (v.2#1) pg. 33, 35

Simple circuit uses an LM317 voltage regulator to "soft start" the filament supply on a vacuum tube.
GLASS AUDIO 2/1990 (v.2#2) pg. 40

Build a novel vacuum-tube AC heater continuity monitor circuit which has three useful applicatons. (1) It controls the B+ voltage, (2) signals an open heater or faulty tube, and (3) disconnects equipment if line voltage fails.
GLASS AUDIO 2/1991 (v.3#2) pg. 32

Filament/heater supply and regulator circuit that eliminates the noise and hum directly introduced from other heater supplies.
GLASS AUDIO 1/1992 (v.4#1) pg. 38
Correction GLASS AUDIO 2/1992 (v.4#2) pg. 54

A low-dropout voltage regulator circuit for vacuum tube circuits delivers a 6.3V DC output from a 6.3V AC winding.
GLASS AUDIO 4/1992 (v.4#4) pg. 14
Added Info GLASS AUDIO 2/1994 (v.6#2) pg. 48
Added Info GLASS AUDIO 4/1994 (v.6#4) pg. 28

Circuit for lighting vacuum tube filaments is especially useful for the 45 and 2A3 tubes.
GLASS AUDIO 1/1997 (v.9#1) pg. 64
Added Info GLASS AUDIO 4/1997 (v.9#4) pg. 57

Advice on lengthening the life of 7591 vacuum tubes in older audio equipment by (1) decreasing the negative grid bias, (2) lowering plate voltage, and/or (3) improved cooling.
GLASS AUDIO 5/1997 (v.9#5) pg. 52

Foolproof circuit for turning on the filaments prior to applying plate voltage.
GLASS AUDIO 2/1998 (v.10#2) pg. 58

Heater care and feedings. An analysis of issues surrounding heater circuits and regulation. Techniques for getting the "hum" out of vacuum tube audio circuits.
GLASS AUDIO 6/1998 (v.10#6) pg. 52

Correct way to wire the vacuum tubes in amplifiers to guarantee that all tubes will receive the same heater supply voltage.
GLASS AUDIO 1/1999 (v.11#1) pg. 67

Filter enhanced regulated heater supply. Modification for a typical voltage-regulator circuit results in a super-stable, ultra-pure, regulated DC voltage to power a vacuum tube heater without ripple, hum or noise.
GLASS AUDIO 2/2000 (v.12#2) pg. 68
Added Info GLASS AUDIO 6/2000 (v.12#6) pg. 62

Simple "crowbar" protection circuit for vacuum tube supply voltage.
POPULAR ELECTRONICS [2] Jul 1993 (v.10#7) pg. 71
Correction POPULAR ELECTRONICS [2] Nov 1993 (v.10#11) pg. 3

Voltage requirements for early vacuum tubes of both the filament and heater style are explained. Part 1.
POPULAR ELECTRONICS [2] May 1998 (v.15#5) pg. 62

Voltage requirements for early vacuum tubes of both the filament and heater style are explained. Part 2.
POPULAR ELECTRONICS [2] Jun 1998 (v.15#6) pg. 50