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About the M60 Mk3.1
The Atma-Sphere M60 Mk3.1 is a high-end, all-triode, class A output-transformerless (OTL) monoblock amplifier delivering 60 watts into 8 ohms, 45 watts into 4 ohms, and 80 watts into 16 ohms. It features a fully balanced differential design with a patented Circlotronic direct-coupled output stage, automatic biasing requiring no adjustment, and a single gain stage for simplicity and clarity. The amplifier uses eight 6AS7G output tubes and four 6SN7 driver tubes per channel, with RCA and XLR true balanced inputs. It has a very fast output risetime of 600 V/µs and low distortion (THD typically under 1%, IM distortion under 0.04% at full power). The M60 Mk3.1 is housed in a retro black Wrinkletex finish with a distinctive industrial-style meter on the transformer housing. It weighs 30 lbs per chassis and measures 17"W x 8"H x 13"D. The amplifier is known for its musicality, holographic soundstage, and reliability with a three-year general warranty and one year on output tubes.
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