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Atma Sphere

Atma-Sphere music systems, Inc. is a small company in Saint Paul, MN that has been making world-class vacuum tube music amplifiers since 1976.

We are known for our unique approach to circuit design, resulting in multiple patents and the creation of the first, truly reliable Output TransformerLess (OTL) amplifiers. We made the first balanced-line products in the world of high-end audio, including the MP-1, which was the world’s first balanced-line preamp.

All of our amps and preamps are hand-crafted and made-to-order according to each customer’s needs. All of our components are hand-selected, and often custom-manufactured especially for us, right down to the wire we use.

The resulting products are unique in the world with an unmatched capacity to reproduce music with intrinsic reliability.