Angela Instruments  
   Audio electronic specialty items for professionals and hobbyists; worldwide shipping.
   http://www.angela.com/

The Brent Jessee Recording Homepage  
   Audiophile, antique, radio, TV, and industrial types of vacuum tubes. Also an online garage sale and a complete list of audio editing and restoration services.
   http://www.audiotubes.com

Electron Tubes  
   Source for electron tubes and valves. Free members area with more than 3500 specs and substitute.
   http://www.halfin.com/shop

Aprilsound  
   Audiophile audio transformers and accessories.
   http://home.earthlink.net/~aprilsound/

Audiomod  
   Can modify old tube or solid state equipment to sould like new using the latest components. Charges for labor time. Parts and return shipping are billed at cost. Free estimates.
   http://www.audiomod.com/

Sowter Transformers Home Page  
   Sowter Audio Transformers (E A Sowter Ltd)
   http://www.sowter.co.uk/

The New Tube  
   Supplier of all types of tubes, speakers, sockets and tube amplifiers.
   http://www.newtube.com

Direct Heating  
   An association for audiophiles in search of musical sound through hand made vacuum tube amplifiers.
   http://www5.big.or.jp/~dh/

Eurotubes  
   Importer of premium european vacuum tubes direct from the manufacture.
   http://www.eurotubes.com

David Berning Co. Audio amplifiers  
   This site contains product information on Berning audio amplifiers that are in production now, as well as technical and service information on discontinued models.
   http://www.davidberning.com

Duncan's amp pages  
   Contains a very large collection of datasheets, schematics and PSPICE models,plus freely downloadable software.
   http://www.duncanamps.com/

Studio M  
   Importer and distributor of high quality hi-fi parts: Lundahl, OEP, Riken, SCR. Located in Italy.
   http://www.studiomaudio.com

www.soundpractices.com  
   Joe Roberts' web site. Many links.
   http://www.soundpractices.com/

IGA Valves  
   Spanish connection for tubes and valves
   http://www.arrakis.es/~igapop/

Fust-electronica  
   Netherlands source for tube information and sales of NOS tubes; Philips and Telefunken.
   http://www.fust-electronica.nl

ATSI Advantage Tube Services  
   Vacuum tubes, tubes, electron tubes: NOS and current for the most demanding audiophile and hobbyist.
   http://vacuumtubeaudio.com/

Maxi-Test Company  
   Digital tube testers for matching and testing power pentode vacuum tubes used in musical equipment amplifiers.
   http://maximatcher.com/

Machmat Tube  
   Information about tubes. Tube datasheets, tube schematics, tube code explanation, tube sales, and tube schematics explained.
   http://www.machmat.com/

vacuumtubes  
   A site devoted to vacuum tube fans. Buy, sell,and trade vacuum tubes. NOS vacuum tubes listed for sale.
   http://www.angelfire.com/on/vacuumtubes

Valvotronics  
   Manufacturer of high end tube audio electronics, including the Gain Ryder 3 compressor.
   http://valvotronics.com/

Audio Valve  
   One of the world fine art tube and valve amplifer for hifi stereo produced in germany.
   http://members.aol.com/AUDIOVALVE/jap.html

Watford Valves  
   UK-based tube supplier. "Digitally matched and graded valves for the music industry."
   http://www.watfordvalves.com/

Amp Mechanic.com  
   Music retailer dealing in amplifier tubes and parts, with tutorials on do-it-yourself amp modification and repair.
   http://www.ampmechanic.com

Variable Voltage Technology Ltd  
   Transformers power supplies and related equipment for audio equipment. Also EL inverters and magnetron transformers. Company is located in England.
   http://www.vvttransformers.co.uk

Fi-Sonik  
   Audio transformers, transformer materials, parts and accessories for tube amps.
   http://www.fisonik.com

BD-Design  
   High-efficiency loudspeakers for tube amps. Turntables and other electronics.
   http://www.bd-design.nl/

Audio Kit Mania  
   Tubes and tube related products to design and build custom amplifiers and systems.
   http://www.audiokitmania.com/

Audiolamp  
   Small company where the primary business is selling audiophile tube parts.
   http://www.audiolamp.com/

Gabriel Sound Garage  
   How to build the 18 Watt all tube guitar combo amplifier. Images, blueprints, tips & tricks.
   http://mamaliga.com/gabriel/

Greenstone USA  
   Manufacturer/distributor of vacuum tubes and vacuum capacitors for audio, broadcast and military applications.
   http://www.greenstoneusa.com

GS Tubes  
   Online store that offers radio tubes for Hi-Fi, Hi-end, amateur radio.
   http://www.gstube.com

THL  
   Taiwanese supplier of audio parts and DIY kits.
   http://www.thlaudio.com/

PAEng Design  
   Devoted to vacuum tubes world applied to audio science. Consulting, design and engineering in audio. Power amplifiers and Hi-End oroducts.
   http://digilander.libero.it/paeng/

Fine Bottle  
   Information, and pointers to information, for builders or otherwise tinkering with vaccuum tube amplifiers.
   http://www.firebottle.com

SND Tube Sales  
   Small online store of tubes parts.
   http://www.vacuumtubes.com

The Vacuum Tube Page  
   Answers the question, "What's so great about tubes?" "Must read" for those getting started in thermionics.
   http://www.ee.ualberta.ca/~schmaus/elect/

Zeitmann tubes  
   Manufacturers of vacuum tubes such as NOS Tungsram audio tubes.
   http://www.zeitmann-tubes.com/

M.V.S.Z AO Svetlana  
   Manufacturers of high end electron tubes Svetlana 300B and Svetlana EL509-II.
   http://www.svetlana-mvsz.com

JJ Electronic  
   Manufacturers of tubes, capacitors for high-end audio amplifiers. Base in Slovak republic and Canada.
   http://www.jj-electronic.sk/

MagneQuest Transformers  
   Makes tube audio transformers such as air-gapped and parallel feed single-ended transformers.
   http://www.magnequest.com/

Hot Glass Audio  
   Repair, modification and restoration of vintage, vacuum tube audio equipment such as tube amplifier.
   http://hotglassaudio.com