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Boulder Amplifiers is an American high-end audio equipment manufacturer founded in 1983 (operations began 1984) by Jeff Nelson in Boulder, Colorado. Originated from professional recording and broadcast industry experience, including development of the pivotal Tomcat cart machine for Pacific Recorders. Distinguished by use of the 990 discrete gain stage technology based on Deane Jensen's work and complete in-house manufacturing control - the last audio manufacturer in North America with this degree of design and production oversight. Relocated multiple times within Colorado, currently operating from a 23,000 square foot facility in Louisville since 2016. With over 40 years of manufacturing experience, employs 11-50 people and distributes to 40+ countries, serving music and film enthusiasts worldwide with hand-crafted premium audio components.