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Ralph Karsten founded Atma-Sphere Music Systems in 1978 and soon introduced the first reliable OTL amps. The Futterman amps had a tendency to belch and blow up, taking down power tubes and speaker drivers and with them, your audio humility. Ever ingenious, Karsten found a way around this problem and produced his first M-60 OTL amplifiers in 1980, just as the audiofools of the world were abandoning solid state en masse for the glory of pure tube amplification. Now more companies produce tube amps than ever before and Atma-Sphere is one of the most famous, honored and awarded makers. Karsten's M-60 has become a very popular amp; heck, even I owned a pair for a while.
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