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Atma-Sphere MA-1 MK3.1 Monoblock Tube Power Amplifiers

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Original price $16,200.00 (61% Off Est. Retail)
Original price From $6,299.00
Original price $16,200.00 (61% Off Est. Retail)
Current price $6,299.00
From $6,299.00
Current price $6,299.00

+$199.00 Shipping to contiguous US.
Tax collected at checkout.

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Cost to ship this item within the Contiguous United States is a flat rate of $199.00, including packaging and insurance. Note that all items valued over $750 will require a signature upon delivery.

We DO NOT offer international shipping.

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Product Highlights

Specifications feature an output power of 140 watts per channel into 8 ohms and 135 watts into 4 ohms. The Atma-Sphere MA-1 MK3.1 is an output transformerless (OTL), direct-coupled monoblock power amplifier utilizing an all-triode, balanced differential design in pure Class-A. Hand-wired point-to-point without circuit boards, it uses a single gain stage and a patented Circlotronic output section for supreme clarity. The open-chassis layout includes an automatic biasing system that eliminates manual adjustments and a VU meter for easy tube monitoring.

Reviewers praise the MK3.1 for its incredible clarity, ultra-low noise floor, and stark reduction in distortion. It is celebrated for its high resolution of micro-dynamic nuances, fast transient response, and a massive, deep soundstage. Critical listeners emphasize its robust, tight, and articulate bass definition, which sets a new standard for tube amplification and drives demanding speaker loads with total authority. The highs offer a realistic shimmer, delivering an organic and tangible musicality.

Bringing this level of engineering into a system moves you past standard hi-fi into an unfiltered live performance. For anyone seeking absolute signal purity and an expansive, layered soundstage that envelopes the room, these monoblocks provide an ultimate destination component. Their combination of transformerless speed, realistic tonal weight, and maintenance-free operation faithfully captures the true emotion of a recording, making them a defining foundation for a lifetime setup.
Brand Atma-Sphere
Type Power Amplifiers
MSRP $16,200.00
SKU # 95631
Serial # 757
Cosmetic Rating

8 - Very good condition with minimal visible cosmetic wear including some scratches and blemishes across the chassis finish. Despite these blemishes, the unit functions wonderfully.

Functional Notes

Operational condition of this item is excellent, fully tested and no issues found.

Age Unknown
Owners Unknown
Service History None

Pair of Amplifiers, Twenty Eight Pro-Comm 6N13PJ Tubes, Eight Unbranded 6SN7GT Tubes, Two SOVTEK 6SN7GT Tubes, Power Cables

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