- David Berning Company
- Manufactures vacuum tube audio amplifiers.
- Greenstone USA
- Manufacturing quality vacuum tubes and vacuum capacitors.
- Hot Glass Audio
- Specializes in the complete electrical restoration and repair of vintage tube audio gear.
- JJ-Electronic
- Development and production of vacuum tubes, tube amplifiers, electrolytic capacitors, polypropylene capacitors.
- MagneQuest Transformers
- Manufactures hand built air-gapped and parallel feed single-ended transformers.
- Maximatcher.com
- Manufactures a line of digital tube testing and matching products.
- Variable Voltage Technology Ltd
- Design and manufacture of power supplies and magnetic wound components for electronic equipment.
- Watford Valves
- Suppliers of tested, graded and guaranteed valves to the professional music industry.
- Zeitmann Tubes
- Offering new and used ECC81 ECC82 ECC83 ECC85 E88CC EL84 and EF86 Tungsram vacuum tubes.
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