DIY Audio and Commercial Hi-Fi Schematics
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Our small collection of DIY Audio and commercial Hi-Fi Audio Schematics that we have collected over the past few years. If you have any hi-fi audio equipment schematics that you would like to share with others, or if you have built any of these circuits, we would love to hear from you so send us an email.
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DIY Audio Schematics
Tube Linestage Preamplifiers
- 6DJ8 / ECC88 SRPP Tube Preamplifier Schematic - (PNG 13kB)
- 5687 LED Biased Tube Preamplifier Project - (Project)
- 12AU7 / ECC82 Cathode Follower Tube Preamplifier Schematic - (PNG 49kB)
- 12AX7 Tube Preamplifier Project - (Project with Testing)
- 12AX7 / 12AU7 Tube Preamplifier - (Project)
Tube Phono Preamplifiers
Tube Amplifiers
2A3
- Single-Ended (SE) 2A3 Tube Amplifier Schematic
- Single-Ended (SE) 2A3 Tube Amp / 6SL7 SRPP Schematic (Loftin-White)
300B
6L6
- 6L6 / 5881 Single-Ended (SE) DIY Tube Amplifier Project - (Project) NEW
6T9
- Single-Ended 6T9 Pentode Tube Amplifier Project - (Project)
- Single-Ended 6T9 Ultra-Linear Tube Amplifier Project - (Project) - [External Link]
- 6T9 Push-Pull Tube Amplifier - (Project)
6V6
- Push-Pull (PP) 6V6 Tube Amplifier Schematic - (Photographs and Commentary)
- Single-Ended (SE) 6V6 Tube Amplifier Schematic
- Direct-Coupled 6V6 Cathode Follower Amplifier - (Technical Paper)
- Dynaco A-410 6V6 Push-Pull Tube Amplifier Schematic
EL34 / 6CA7
- EL34 Single-Ended (SE) Tube Amplifier Schematic
- Mullard EL34 Push-Pull Tube Amp Schematic with Dynaco A420
EL84 / 6BQ5
- Dynaco A-410 EL84 Push-Pull Tube Amplifier Schematic
- Mullard Single-Ended (SE) EL84 Tube Amplifier Schematic
- Push-Pull (PP) EL84 Tube Amplifier Schematic
- EL84 Push-Pull (PP) Tube Amplifier Project - (Project)
- 6BQ5 (EL84) Compact Hi-Fi Power Amplifier - (Technical Paper)
- Class-A EL84 (6BQ5) Push-Pull DIY Tube Amplifier - (Project)
KT77
- KT77 Push-Pull (PP) Tube Amplifier Project - (Project)
KT88
- Mikael Abdellah's Single-Ended (SE) KT88 Tube Amplifier
- Jean Hiraga 12AX7 / Single-Ended KT88 Tube Amplifier
- KT88 Single-Ended (SE) Tube Amplifier Project - (Project)
- 5751 SRPP / KT88 Push-Pull Monoblock Tube Amp Kits - (Project)
Hybrid Amplifiers (Tubes mixed with Solid State)
- 12AU7 Tube / IRF612 MOSFET Headphone Amp - (Project)
- 12AU7 (ECC82) Tube / IRF510 MOSFET Headphone Amplifier - (Project) NEW
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
Headphone Amplifiers
- Grado RA1 Headphone Amplifier Schematic - [External Link]
- Class A MOSFET Headphone Amplifier Project - (Project)