Angela Instruments
Audio electronic specialty items for professionals and hobbyists; worldwide shipping.

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.

Electron Tubes
Source for electron tubes and valves. Free members area with more than 3500 specs and substitute.

Aprilsound
Audiophile audio transformers and accessories.

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.

Sowter Transformers Home Page
Sowter Audio Transformers (E A Sowter Ltd)

The New Tube
Supplier of all types of tubes, speakers, sockets and tube amplifiers.

Direct Heating
An association for audiophiles in search of musical sound through hand made vacuum tube amplifiers.

Eurotubes
Importer of premium european vacuum tubes direct from the manufacture.

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.

Duncan's amp pages
Contains a very large collection of datasheets, schematics and PSPICE models,plus freely downloadable software.

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

www.soundpractices.com
Joe Roberts' web site. Many links.

IGA Valves
Spanish connection for tubes and valves

Fust-electronica
Netherlands source for tube information and sales of NOS tubes; Philips and Telefunken.

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

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

Machmat Tube
Information about tubes. Tube datasheets, tube schematics, tube code explanation, tube sales, and tube schematics explained.

vacuumtubes
A site devoted to vacuum tube fans. Buy, sell,and trade vacuum tubes. NOS vacuum tubes listed for sale.

Valvotronics
Manufacturer of high end tube audio electronics, including the Gain Ryder 3 compressor.

Audio Valve
One of the world fine art tube and valve amplifer for hifi stereo produced in germany.

Watford Valves
UK-based tube supplier. "Digitally matched and graded valves for the music industry."

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

Variable Voltage Technology Ltd
Transformers power supplies and related equipment for audio equipment. Also EL inverters and magnetron transformers. Company is located in England.

Fi-Sonik
Audio transformers, transformer materials, parts and accessories for tube amps.

Triode Electronics
Tubes and parts for Hi-Fi, radio, guitar; tube data and amp schematics.

BD-Design
High-efficiency loudspeakers for tube amps. Turntables and other electronics.

Audio Kit Mania
Tubes and tube related products to design and build custom amplifiers and systems.

Audiolamp
Small company where the primary business is selling audiophile tube parts.

Gabriel Sound Garage
How to build the 18 Watt all tube guitar combo amplifier. Images, blueprints, tips & tricks.

Greenstone USA
Manufacturer/distributor of vacuum tubes and vacuum capacitors for audio, broadcast and military applications.

GS Tubes
Online store that offers radio tubes for Hi-Fi, Hi-end, amateur radio.

THL
Taiwanese supplier of audio parts and DIY kits.

PAEng Design
Devoted to vacuum tubes world applied to audio science. Consulting, design and engineering in audio. Power amplifiers and Hi-End oroducts.

Fine Bottle
Information, and pointers to information, for builders or otherwise tinkering with vaccuum tube amplifiers.

SND Tube Sales
Small online store of tubes parts.

The Vacuum Tube Page
Answers the question, "What's so great about tubes?" "Must read" for those getting started in thermionics.

Zeitmann tubes
Manufacturers of vacuum tubes such as NOS Tungsram audio tubes.

M.V.S.Z AO Svetlana
Manufacturers of high end electron tubes Svetlana 300B and Svetlana EL509-II.

JJ Electronic
Manufacturers of tubes, capacitors for high-end audio amplifiers. Base in Slovak republic and Canada.

MagneQuest Transformers
Makes tube audio transformers such as air-gapped and parallel feed single-ended transformers.

Hot Glass Audio
Repair, modification and restoration of vintage, vacuum tube audio equipment such as tube amplifier.