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Atma-sphere is the oldest manufacturer of Output TransformerLess (OTL) triode amplifiers in the world; 2003 was their twenty-fifth year. All their amplifiers are Class A and feature Balanced Differential Design® - a total design philosophy that runs from preamp input right through to the power amplifier. Their OTL configuration is built around the unique Circlotronic® circuitry that offers the simplest audio circuit path from the source to the loudspeaker. Atma-sphere amplifiers and preamplifiers have together now garnered five Golden Ear Awards from The Absolute Sound, the most prestigious hifi journal in the world. Because they do not feature output transformers to couple the tubes to the speaker load, Atma-sphere amplifiers allow the real beauty of tube power to shine through – dynamics and transparency that transformer-coupled tube amplifiers can only dream about – but only if partnered carefully with appropriate loudspeakers! Essentially this means loudspeakers whose impedance doesn’t drop below around 6-8ohms – in fact the higher the impedance of the speaker, the better, because OTL amps produce their power via voltage rather than current, so as a speaker’s impedance rises, so the amplifier’s output increases. Coincident and Zu loudspeakers are perfect examples.
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