DIY Audio Schematics
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By no means with this ever be a comprehensive Hi-Fi Audio Schematics Repository. Here you will find some schematics for various DIY Audio Projects and some commercial Hi-Fi components that I find interesting. If you have a schematic that you would like to share, please contact me.
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DIY Audio Schematics
Tube Linestage Preamplifiers
- 6DJ8 / ECC88 SRPP Tube Preamplifier Schematic - (PNG 13kB)
- 5687 LED Biased Tube Preamplifier Project - (Documented Project)
- 12AU7 / ECC82 Cathode Follower Tube Preamplifier Schematic - (PNG 49kB)
- 12AX7 Tube Preamplifier Project - (Documented Project with Testing)
- 12AX7 / 12AU7 Tube Preamplifier - (Documented Project)
Tube Phono Preamplifiers
- 6DJ8 Tube Phono Preamplifier Schematic - (JPG 107kB)
- 7025 / 12AX7A / ECC803S Tube Phono Preamplifier Schematic - (PNG 448kB)
Tube Amplifiers
2A3
- Single-Ended (SE) 2A3 Tube Amplifier Schematic - (PNG 37kB)
- Single-Ended (SE) 2A3 Tube Amp / 6SL7 SRPP Schematic (Loftin-White) - (JPG 80kB)
300B
6T9
- 6T9 Pentode Tube Amplifier Project - (Documented Project with Testing)
- 6T9 Ultra-Linear Tube Amplifier Project - (Documented Project with Testing) - (External Link)
6V6
- Single Ended (SE) 6V6 Tube Amplifier Schematic - (PNG 26kB)
EL34 / 6CA7
- EL34 Single Ended (SE) Tube Amplifier Schematic - (PNG 49kB)
- Mullard EL34 Push-Pull Tube Amp Schematic with Dynaco A420 - (PNG 56kB)
EL84 / 6BQ5
- Mullard Single Ended (SE) EL84 Tube Amplifier Schematic - (PNG 24kB)
- Push-Pull (PP) EL84 Tube Amplifier Schematic - (PNG 46kB)
- EL84 Push Pull (PP) Tube Amplifier Project - (Documented Project with Testing)
KT77
- KT77 Push Pull (PP) Tube Amplifier Project - (Documented Project with Testing)
KT88
- Mikael Abdellah's Single Ended (SE) KT88 Tube Amplifier - (PNG 17kB)
- Jean Hiraga 12AX7 / Single Ended KT88 Tube Amplifier - (PNG 39kB)
- KT88 Single Ended (SE) Tube Amplifier Project - (Documented Project)
Hybrid Amplifiers (Tubes mixed with Solid State)
- 12AU7 Tube / IRF612 MOSFET Headphone Amp - (Documented Project with Testing)
Commercial Hi-Fi Schematics
At the request of NAD Electronics / Lenbrook America, we have removed the NAD Service Manuals and Schematics from this site. For more information on this matter, please see NAD Service Manuals and Schematics.
Tube Amplifiers
- Dynaco ST35 Tube Amplifier Schematic - (PNG 174kB)
- Dynaco ST70 Tube Amplifier Schematic - (PNG 20kB)
Headphone Amplifiers
- Grado RA1 Headphone Amplifier Schematic - (External Link)
- Class A MOSFET Headphone Amplifier Project - (Documented Project with Testing)