Rick-Tone
- Parts, schematics, and technical information for Rick-Tone and other vacuum tube guitar amplifiers by Rick Campbell.
- http://www.ricktone.com/

Steve's Amp Revamps
- Amplifier repairer and modifier's site based in Surrey, UK. Contains amp modification faq.
- http://www.stevesamps.co.uk/

Vox Amplification
- Manufacturers of Vox Guitar Amplifiers and Effects Pedals. Valve state and digital guitar amps, online product registration, spare parts and official merchandise.
- http://www.voxamps.co.uk/

Pure Sixty-Four Guitar Amplifiers
- Offering boutique guitar amplifiers including the "64" and the "Nitro".
- http://www.puresixtyfour.com/

Euphonic Audio
- High end bass cabinets and combo amps.
- http://www.eaamps.com/

Electrosonic Amplifiers
- Builds custom all-tube guitar amplifiers. Information about products and services to musicians.
- http://www.electrosonicamplifiers.com/

Flat Stone Amplifiers
- Manufactures custom, hand-built tube guitar amplifiers. Includes specifications, company history, and contact details.
- http://www.flatstoneamps.com/

Singlecoil.com
- A library of do-it-yourself projects to modify stompboxes and effects, amps and guitars; includes a components shop.
- http://www.singlecoil.com/

Z.Vex Effects
- Manufacturer of amplifiers and effects pedals; includes product details, manuals, sound samples and ordering instructions.
- http://www.zvex.com/

Rocktron
- Manufacturer of amplification and effects technology; includes product details, dealer listing and technical support.
- http://www.rocktron.com/

L.R. Baggs
- Manufacturer of advanced pickups and electronics for guitar and other stringed instruments. Includes product details, manuals, and reviews.
- http://www.lrbaggs.com/

Hiwatt Amplification
- Model and tech information, catalog, and dealers.
- http://www.hiwatt.com/

Metaltronix Amplifiers
- Information on Metaltronix amplifiers including manuals, settings, schematics, history, ads, and message board.
- http://www.metaltronix.net/

Cornford Amplification
- UK maker of valve guitar amplifiers. Includes sound samples [requires Flash 5].
- http://www.cornfordamps.com/

Laney
- UK manufacturer of guitar and bass amplifiers. [requires Flash]
- http://www.laney.co.uk/

Torres Valve Amplifiers
- Custom built tube amps, amplifier kits, and parts. Includes information on building and modding your amp.
- http://freespace.virgin.net/vyse.co/

Gerhart Amplification
- Handmade tube guitar amps and kits.
- http://www.gerhartamps.com/

Aiken Amplification
- Manufacturer of tube guitar amps and attenuaters. In-depth technical database.
- http://www.aikenamps.com

Line 6
- Digital guitar amps and equipment.
- http://www.line6.com/

Kendrick Amplifiers
- Manufacturer of tube amps, guitars, and related accessories. Parts, repairs and restoration of vintage tube amps. Site features a demo room with MP3 clips, a company history section, and ordering information.
- http://www.kendrick-amplifiers.com/

Marshall Arts
- User-maintained site including information on past and current Marshall amplifiers, speaker cabinets and accessories. User-submitted photos of Marshall equipment and FAQs.
- http://www.blamepro.com/mar/

Trance Audio, Inc.
- Amplification systems for acoustic guitar. Product information; downloadable .pdf manuals.
- http://www.tranceaudio.com/

Amp Tone
- Information about distortion voicing, effects placement, and cranked-tube-amp tone at any volume.
- http://www.amptone.com/

Juke Amplification
- Hand-built vacuum tube amps. Models, specifications, purchase information.
- http://www.jukeamps.com/

Roccaforte Amps
- Custom, hand-built tube guitar amplifiers. EL34 tubes, English transformes, turret board construction. Amp prototypes, repairs and modifications.
- http://www.roccaforteamps.com/

Tone King Amplifier Company
- Manufacturer of vacuum-tube guitar amplifiers.
- http://www.toneking.com/

Plexi Palace
- Vintage guitar amplifier sales and service. Apple Valley, California.
- http://www.vintageamps.com/

Garnet Guitar Amplifiers
- Facts, photos, specs and details of Garnet amps, as well as a serial number registry.
- http://www.garnetamps.com/

Matamp Amplifiers
- Green Amps: tube and valve amplifiers from the original manufacturer of Orange Guitar and Bass amps.
- http://www.greenamps.com/

Victoria Amp Company
- Detailed descriptions of the various models offered as well as the components used. Also contains a dealers list by state and links to parts suppliers and reference material.
- http://www.victoriaamp.com/

Soldano Custom Amplification
- Information regarding reverbs, heads, preamps, and special effect equipment as well as a list of retails and famous users. Also features a FAQ section and contact information.
- http://www.soldano.com/

Naylor Amps
- Product features and details pertaining to tone and response. Also contains speakers and padded covers, a distributor list, and contact information.
- http://www.naylorengineering.com/

Mesa Boogie
- Manufacturers located in Petaluma, California. Features a tour through the construction process, a dealer list, and a new product release section.
- http://www.mesaboogie.com/

Marshall Amplification
- Product images and specifications, information on 'rock kits' as well as free instructional material and desktop themes. Also contains a player feedback section, handbooks for download, and an archive of past products.
- http://www.marshallamps.com/

Hughes and Kettner
- Product specifications and detailed descriptions, as well as an image gallery. Also features an artist list, dealer information, and downloadable user manuals. Available in English and Dutch.
- http://www.hughes-and-kettner.com/

Kustom
- Guitar and bass amplifiers, as well as P.A. systems, stage monitors, microphones, and speakers.
- http://www.kustom.com/

Hoffman Amplifiers
- Tube amp parts, tube amplifier building supplies, books/videos about tube amps.
- http://www.hoffmanamps.com/

Gallien-Krueger
- Bass cabinets, heads, combos, and accessories.
- http://www.gallien.com/

Eden Electronics
- Bass amplification products.
- http://www.eden-electronics.com/

Dr Z Amplifiers
- Professional quality amps with sound clips and reviews.
- http://www.drzamps.com/

Crate Amps
- Company background information and product overviews, as well as a dealer list, and a support section containing FAQs, and downloadable manuals. Also features a list of users and the gear they selected.
- http://www.crateamps.com/

Demeter Amplification
- Products listed by category and includes: pro audio, guitar, bass, and accessories sections with detailed specifications and cabinet descriptions. Company history and contact information are also available as well as an artist list.
- http://www.demeteramps.com/

Aguilar Amplifiers
- Makers of handmade bass amps.
- http://www.aguilaramp.com/