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About the MP1
The Atma-Sphere MP-1 Mk 3.3 is a unique two-chassis fully differential balanced vacuum tube preamplifier renowned for its transparency, low noise, and resistance to cable coloration through its Balanced Line system (AES48). It outperforms conventional line stages with a patented direct-coupled Circlotronic output, enabling greater dynamic range and detail retrieval. The design includes zero feedback, dual-mono construction, differential passive phono equalization, and low-noise star grounding. It supports both MM and MC cartridges (down to 0.15mV standard, optional step-up for <0.2mV), drives 32 ohm headphones, and features a precision 24-position Shallco stepped volume control. Power supply is isolated in a separate chassis. Options include remote volume, V-CAP capacitors, Caddock resistors/volume control, damping package, and dual phono inputs. Tube complement: 10 x 12AT7 (phono), 6 x 6SN7 (line). Three-year warranty (one year on tubes). Currently manufactured.[1][2][4][7][10]
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