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Manufacturer: Atma-Sphere, Inc., 160 South Wheeler, St. Paul, MN 55105 USA 651/690-2246; http://www.atma-sphere.com
Price: $2,850
Source: Manufacturer Loan
Reviewer: Tom Lyle
Atma-Sphere, which Ralph Karsten started in 1978, is the oldest manufacturer consistently producing OTL (output transformerless) and triode amplifiers. AtmaSphere claims to manufacture the world's first reliable and fully balanced OTL power amplifier, the first all-triode fully differential zero feedback tube amp, and the first commercial tube amp with only one stage of gain. Mr. Karsten patented a Circlotronic[TM] design, which he says is superior to the ...