Web community dedicated to DIY audio projects and discussion.

Describes a 50 watt tube power amplifier for high end applications, including schematics and description of the circuitry.

Projects by Nelson Pass including amplifiers, preamps and loudspeakers. Site offers information on circuit boards, FAQs and how to articles.

Information for audio DIY hobbyists. Articles, construction projects, links, sources.

Includes projects and articles about amplifiers, preamplifiers, speakers and cables.

Depository for a variety of audio designs and projects, especially tubular amplifiers. Site offers photo gallery and details on the author's projects, downloadable PDF documents, and technical diagrams.

Marco Rutz shares his experiences and projects in design, acoustics and recording. Personal observations, current and past projects, photo gallery, and high-end systems are showcased.

A resource for the design and construction of speaker cables, interconnects, and digital cable from inexpensive and commonly available wire and cable products.

Projects and tutorials. Switched Mode Power Supplies, Vacuum tube and solid state audio amps.

Discussion of vacuum tube audio amplifiers and high fidelity equipment with photos and schematic diagrams.

Vacuum tubes for antique radios and tube audio gear.

DIY site specializing in tube audio, vintage style guitar amps, mad science and all around DIY hooliganism.

Offers a range of drawings, photos of components and complete builds, downloadable manuals, and descriptions to build vacuum tube amplifiers.

Information on speaker building: how to build speakers, find drivers and a listing of projects.

British-based informal group focused on advancing do-it-yourself audio reproduction features membership details, overview of current and past projects, a newsletter, articles on systems, and links.

Self-built guitar tub amplifiers. Showcases design and stories beyond tube amp building, effects pedal building, and related music projects.

Kristijan Kljucaric offers his blue-colored PC board (PCB) designs for high-end DIY projects supported by Pass Labs, including amplifiers, pre-amps, crossovers, and power supplies.

Description and photos of multi-amp PCB with three integrated amplifiers each PCB and 24 dB/Octave Linkwitz-Riley Electronic filters. Configurable as a bi-amp or tri-amp.

Passive 2-way crossover spreadsheet design tool. Models allow complex speaker impedance, acoustic target shapes, series or parallel designs, and impedance compensation circuits.

Information on HiFi electrostatic loudspeakers. Contains information on how to get started and build a basic panel.

Showcases the author's build of tube amplifiers, pre-amplifiers and restorations of tube radios.

Includes datasheets and reference articles on audio and headphone amplifiers, preamplifiers, head and phono amps.

The site for audiophiles and/or fanatics.

DIY resource for Audiophiles. Includes recipes for Cat5 speaker cable, fine silver interconnects, and power cords.

Beginners guide offers an introduction to DIY hi-fi. Includes articles on building, modifying and buying components.