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

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/

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

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

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

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

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

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

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/

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/

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/

Rivera Amplifiers Details and product specifications on all-tube amplifiers as well as cabinets, and accessories. Features user manuals, sound clips, and a news section, plus dealer listings, artist recommendations, and a message board and FAQ. http://www.rivera.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/

Quality Research Company JamPak, a portable pocket amp, uses standard 9V battery and Walkman-type headphones. For practice and personal use. http://www.qrc-innovation.com/jampak/jampak.htm

Trace Elliot Images, details, and specifications on various models. Also features a list of artist recommendations and a video clip. http://www.trace-elliot.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/

Webb Amps Custom products hand built in Antioch, California. Contains background information on the shop, contact details, and a price list. http://www.webbamps.com/

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