DIY and Hi-Fi Audio Schematics

This is our collection of DIY and Hi-Fi Audio Schematics. Feel free to send us your hi-fi audio schematics and we will add them here. If you have built any of these circuits, we would love to hear from you so send us your comments.

Many of these diy Audio Books contain schematics. You can also find more schematics through some of the sites noted on the DIY Audio Links page.

Last update: 24 July 2016

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Tube Linestage Preamplifiers

4S Universal Preamplifier for 12A*7 Tubes - (Project) NEW
12AU7 / ECC82 / ECC802S Tube SRPP Preamp Schematic - (Project)
12AX7 Tube Hi-Fi Preamplifier Schematic - (Project)
12AU7 / ECC82 Cathode Follower Tube Preamplifier Schematic
5687 (LED bias) Tube Hi-Fi Preamplifier Schematic - (Project)
6DJ8 / ECC88 SRPP Tube Preamplifier Schematic

Tube RIAA Phono Hi-Fi Preamplifiers

Tube Amplifiers

2A3 - directly heated power triode

SET 2A3 Tube Amplifier Schematic (EF86 input) - [3.5 Watts, SET, class-A]
SET 2A3 Tube Amp Schematic by Loftin-White (6SL7 SRPP input) - [3.5 Watts, SET, class-A]

300B - directly heated power triode

SET 300B Tube Amplifier Schematic (6SN7 driver) - [8 Watts, SET, class-A] - (Photographs)
Parallel PP 300B Tube Mono Block Amplifier Schematic - [25 Watts, PP, class-A] - (External Link)
DIY 300B Single-Ended-Triode (SET) Hi-Fi Amplifier - [8 Watts, SET, class-A] - (Project) NEW

EL84, 6BQ5 - power pentode

SE EL84 Tube Amplifier Schematic by Mullard (EF86 input) - [3 Watts, SE, class-A]
SIPP 6BQ5 Tube Mono Block Amplifier (6C4 input) - [6 Watts, SIPP, class-A] - (Technical Paper)
SIPP EL84 (6BQ5) Tube Stereo Amp Schematic (ECC802S SRPP input) - [12 Watts, SIPP, class-A, UL] - (Project)
SIPP EL84 (6BQ5) Tube Stereo Amp Schematic (5751 SRPP input) - [5 Watts, SIPP, class-A, UL] - (Project) UPDATED
SIPP EL84 (6BQ5) Tube Mono Block Amp Schematic - [5.8 Watts, SIPP, class-A, UL] - (Project)
PP EL84 Tube Amplifier Schematic (ECC83 input) - [15 Watts, PP, class-AB1]
PP EL84 Tube Amp Schematic with Dynaco A-410 (12AX7 or 6SL7 input) - [12 Watts, PP, class-AB1]

6V6 - beam power pentode

SE-UL 6V6 Tube Stereo Amplifier Schematic (6SN7 input) - [4.5 Watts, SE, UL, class-A] - (Photographs) NEW
SE 6V6 Tube Amplifier Schematic (ECC83 input) - [4.5 Watts, SE, class-A]
Cathode Follower 6V6 Tube Mono Block Amp Schematic (6SJ7 input) - [4.5 Watts, CF, class-A] - (Technical Paper)
PP 6V6 Tube Stereo Amplifier Schematic (6SL7 input) - [12 Watts, PP, class-AB1] - (Photographs)
PP 6V6 Tube Amp Schematic with Dynaco A-410 (12AX7 or 6SL7 input) - [12 Watts, PP, class-AB1]

EL34, 6CA7 - power pentode

SE EL34 Tube Amplifier Schematic (EF86 input) - [8 Watts, SE, class-A, Pentode]
SE EL34, 6CA7 Tube Stereo Amplifier Schematic (6N1P input) - [4 Watts, SE, class-A, Triode or UL] - (Project)
SIPP EL34, 6CA7 Tube Mono Block Amp Schematic (5751 SRPP input) - [15 Watts, SIPP, class-A, UL] - (Kit)
SIPP EL34, 6CA7 Tube Mono Block Amp Schematic (12SL7 SRPP input) - [15 Watts, SIPP, class-A, UL] - (Project)
PP EL34 Tube Amp Schematic by Mullard with Dynaco A420 (EF86, 6CG7 input) - [50 Watts, PP, Class-AB1]

6L6, 5881, KT66, 7027 - beam power pentode

SE 6L6, 5881 Tube Stereo Amplifier Schematic (6SJ7 input) - [8 Watts, SE, class-A, Pentode] - (Project)
SE 6L6, 6CA7 Tube Stereo Amplifier Schematic (6N1P input) - [4 Watts, SE, class-A, Triode or UL] - (Project)
SIPP 6L6, 5881, KT66 Tube Mono Block Amp Schematic (5751 SRPP input) - [15 Watts, SIPP, class-A, UL] - (Kit)
SIPP 6L6, 5881, KT66 Tube Mono Block Amp Schematic (12SL7 SRPP input) - [15 Watts, SIPP, class-A, UL] - (Project)

KT77 - beam tetrode

SIPP KT77 (class-A) Tube Stereo Amp Schematic (6SL7 SRPP input) - [25 Watts, SIPP, class-A, UL] - (Project)
SIPP KT77 Tube Mono Block Amp Schematic (5751 SRPP input) - [15 Watts, SIPP, class-A, UL] - (Kit)
SIPP KT77 Tube Mono Block Amp Schematic (12SL7 SRPP input) - [15 Watts, SIPP, class-A, UL] - (Project)

6550, KT88, KT90 - beam tetrode

SE 6550 Tube Mono Block Amplifier Schematic (12DW7 input) - [7 Watts, SE, class-A] - (Photographs)
SE KT88 Tube Amplifier Schematic (6N1P input) - [5 Watts, SE, class-A, UL] - (Photographs)
SE KT88 Tube Amplifier Schematic (12AX7 SRPP input) by Jean Hiraga - [6 Watts, SE, class-A]
SE 6550 / KT88 Tube Stereo Amplifier Schematic (6N1P input) - [4 Watts, SE, class-A, Triode or UL] - (Project)
SIPP 6550, KT88, KT90 Tube Mono Block Amp Schematic (5751 SRPP input) - [25 Watts, SIPP, class-A, UL] - (Kit)
SIPP 6550, KT88, KT90 Tube Mono Block Amp Schematic (12SL7 SRPP input) - [25 Watts, SIPP, class-A, UL] - (Project)

KT120 - pentode

SIPP KT120 Tube Mono Block Amp Schematic (12SL7 SRPP input) - [45 Watts, SIPP, class-A, UL] - (Photographs) NEW

Compactron Tubes

SE 6T9 Tube Stereo Amplifier Schematic - [4 Watts, PP, Class-A] - (Project)
SE 6T9 Tube Stereo Amplifier Schematic - [4 Watts, PP, Class-A, Ultra-Linear] - (External Link)
PP 6T9 Tube Stereo Amplifier Schematic - [10 Watts, PP, Class-AB1] - (Project)

Legend: PP = Push-Pull, SE = Single-Ended, SET = Single-Ended Triode, SIPP = Self-Inverting Push-Pull, UL = Ultra-Linear

DIY Audio Schematics

IC (Integrated Circuit) Amplifiers

Gobo LM1875 Stereo Amplifier Schematic - [15 Watts, class-AB] - (Kit) NEW
TDA2050 IC Hi-Fi Amplifier Schematic - [25 Watts, class-AB] - (Project)
LM3875 IC Hi-Fi Amplifier Schematic - [50 Watts, class-AB] - (Project)
LM3886 IC Hi-Fi Amplifier Schematic - [60 Watts, class-AB] - (Project)

Hi-Fi Audio Schematics

Tube Amplifiers

Dynaco Dynakit Stereo 35 (ST35) Tube Amplifier Schematic - [17.5 Watts, PP, class-AB]
Dynaco Dynakit Stereo 70 (ST70) Tube Amplifier Schematic - [35 Watts, PP, class-AB]
Dynaco Dynakit Mark III Tube Amplifier Schematic - [60 Watts, PP, class-AB] NEW
Dynaco Dynakit Mark IV Tube Amplifier Schematic - [40 Watts, PP, class-AB] NEW

Headphone Amplifiers

Grado RA1 Headphone Amplifier Schematic - [class-AB] - (External Link)

DIY and Hi-Fi Audio Schematics