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, schematics, code explanation, and sales.
Valvotronics - Manufacturer of high end tube audio electronics, including the Gain Ryder 3 compressor.
Watford Valves - Suppliers of tested, graded and guaranteed valves to the professional music industry. UK.
Variable Voltage Technology Ltd - Transformers power supplies and related equipment for audio equipment. Also EL inverters and magnetron transformers. UK.
Audio Kit Mania - Distributor of tube and related products to design and build custom amplifiers and systems.
Gabriel Sound Garage - Make a 18 watt tube guitar combo amplifier. Images, blueprints, tips & tricks.
Greenstone USA - Manufacturer and distributor of vacuum tubes and capacitors for audio, broadcast and military applications.
THL - Supplier of audio parts and DIY kits. Taiwan.
PAEng Design - Devoted to vacuum tubes world applied to audio science. Consulting, design and engineering in audio. Power amplifiers and Hi-End products.
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 - 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.
D.Klimo - Manufacturer of a variety of high end tubes. Germany.
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