Audio Kit Mania - Distributor of tube and related products to design and build custom amplifiers and systems..
David Berning Company - Manufactures a series of vacuum tube audio amplifiers based on impedance converter that replaces the traditional audio-output transformer. Italy..
D.Klimo - Manufacturer of a variety of high end tubes. Germany..
Greenstone USA - Manufacturer and distributor of vacuum tubes and capacitors for audio, broadcast and military applications..
Hot Glass Audio - Repair, modification and restoration of vintage, vacuum tube audio equipment such as tube amplifier..
JAC-Music - Provides information about electron tubes products, support, distributor addresses, datasheets and sells tubes parts..
JJ Electronic - Manufacturers of tubes, capacitors for high-end audio amplifiers. Base in Slovak republic and Canada..
Machmat Tube - Information about tubes. Tube datasheets, schematics, code explanation, and sales..
MagneQuest - Makes tube audio transformers such as air-gapped and parallel feed single-ended transformers..
Maxi-Test Company - Digital tube testers for matching and testing power pentode vacuum tubes used in musical equipment amplifiers..
PAEng Design - Devoted to vacuum tubes world applied to audio science. Consulting, design and engineering in audio. Power amplifiers and Hi-End products..
THL - Supplier of audio parts and DIY kits. Taiwan..
Valvotronics - Manufacturer of high end tube audio electronics, including the Gain Ryder 3 compressor..
Variable Voltage Technology Ltd - Transformers power supplies and related equipment for audio equipment. Also EL inverters and magnetron transformers. UK..
Watford Valves - Suppliers of tested, graded and guaranteed valves to the professional music industry. UK..
Zeitmann tubes - Manufacturers of vacuum tubes such as NOS Tungsram audio tubes..
