LAB12 Suono Mk2 Toroid Class-A Tube Amplifier at Vinyl Sound Buffalo NY

The Suono Mk2 Toroid is a single-ended Class A tube amplifier from LAB12 (Athens, Greece), available at Vinyl Sound in Buffalo, NY. Producing 25 watts per channel from KT150 power pentodes in a single-ended Class A circuit, it delivers the texture, dimensionality, and harmonic completeness of SET amplification while offering enough output power to anchor more complex loudspeakers and fill larger listening spaces. Selectable triode and ultralinear operating modes, top-mounted manual bias adjustment, and LAB12's SRSG grounding and Fine Symmetry topology complete a design that occupies an important position between low-power SET amplifiers and high-power push-pull designs.

Single-Ended Class A Architecture with Real-World Power

The Suono Mk2 Toroid retains the single-ended output topology that defines the SET listening experience, the absence of crossover distortion, the continuous Class A bias across the entire dynamic range, and the natural, unforced quality that makes single-ended amplifiers so compelling for long-session listening. Where most single-ended designs are limited to 8 to 15 watts per channel, the Suono Mk2 Toroid achieves 25 watts per channel through a carefully engineered circuit that extracts maximum power from the KT150 output tube within the constraints of single-ended operation. A low-noise toroidal power transformer provides the clean, stable voltage rails that Class A operation demands, and the absence of global negative feedback preserves the natural dynamics of the original recording.

Triode and Ultralinear Flexibility with SRSG and Fine Symmetry

The Suono Mk2 Toroid's front-panel triode and ultralinear mode selector allows the listener to explore two fundamentally different presentations without changing tubes or making circuit modifications. Top-mounted manual bias adjustment points simplify tube maintenance and are accessible without removing the amplifier from the rack. LAB12's SRSG (Separate Rails Separate Grounds) implementation maintains a fully isolated path between signal and power supply grounds throughout the circuit, minimizing noise ingress and lowering the noise floor. The Fine Symmetry circuit layout ensures that the two channels track each other with precision, maintaining accurate stereo imaging across the full frequency range. Analog Nissei VU meters on the front panel provide a classic visual reference during playback.

Key Features

• Single-Ended Class A Output Stage: A true single-ended circuit operating in Class A throughout its power range, delivering the harmonic completeness and natural decay associated with the finest SET designs.
• KT150 Output Tubes: Factory-installed KT150 power pentodes; compatible with 6550, KT88, and KT120 for tube rolling.
• Low-Noise Toroidal Power Transformer: A single high-quality toroidal transformer provides stable, low-noise power to the output stage and driver circuits.
• Triode / Ultralinear Mode Selector: Front-panel switch provides direct access to two distinct operating modes with different sonic signatures.
• Top-Mounted Bias Adjustment: Easily accessible bias trimmers on the top panel allow quick and precise tube biasing without requiring amplifier disassembly.
• No-Feedback Design: Zero global negative feedback for an open, natural, and unforced presentation.
• SRSG Grounding: Separate Rails Separate Grounds implementation maintains full isolation between signal and power ground paths.
• Fine Symmetry Layout: Precision circuit geometry ensures matched performance between both channels.
• Analog Nissei VU Meters: Classic front-panel VU meters for real-time level monitoring during playback.
• Precision 5mm Aluminum Panel: Available in Matte Black or Frozen Silver with a glass-blasted anodized finish and a five-year manufacturer guarantee.

Technical Specifications

Frequently Asked Questions

What is the LAB12 Suono Mk2 Toroid?

The LAB12 Suono Mk2 Toroid is a single-ended Class A tube amplifier from Athens, Greece, producing 25 watts per channel from KT150 power pentodes. It offers selectable triode and ultralinear modes, top-mounted bias adjustment, a low-noise toroidal power transformer, and LAB12's SRSG grounding and Fine Symmetry layout in a precision 5mm aluminum chassis available in Matte Black or Frozen Silver, with a five-year manufacturer guarantee.

How does the Suono Mk2 Toroid compare to the Line Magnetic LM-805IA?

The LAB12 Suono Mk2 Toroid and the Line Magnetic LM-805IA are both single-ended Class A tube amplifiers designed for listeners who prioritize harmonic richness and natural tonal character. The LM-805IA uses 805A transmitting triodes in a directly heated configuration, producing approximately 48 watts per channel, and is typically paired with high-efficiency speakers of 93 dB and above. The Suono Mk2 Toroid uses KT150 pentodes in a single-ended circuit with selectable pentode and triode modes, producing 25 watts per channel, and its 4 to 8 ohm load compatibility makes it practical with a wider range of modern loudspeakers. Listeners who want single-ended character without restricting their speaker options will find the Suono Mk2 Toroid the more flexible choice.

What loudspeakers pair well with the Suono Mk2 Toroid?

The Suono Mk2 Toroid performs best with loudspeakers of 88 dB sensitivity or higher in typical room sizes, pairing naturally with designs such as the Klipsch Heresy IV, the Totem Acoustic Hawk, or the DALI Oberon 9. In ultralinear mode, the amplifier's tighter bass control and extended bandwidth make it compatible with a broader range of 4 to 8 ohm designs. In triode mode, higher-efficiency speakers will allow the amplifier's harmonic character to express itself most fully. Vinyl Sound Buffalo can provide system matching guidance based on the specific loudspeakers under consideration.

What is the difference between the Suono Mk2 and the Suara Mk2?

The Suono Mk2 Toroid and the Suara Mk2 Toroid share the same LAB12 circuit philosophy but occupy different positions in the power hierarchy. The Suono Mk2 Toroid uses a single pair of output tubes (two KT150s) in a single-ended Class A circuit producing 25 watts per channel, prioritizing the pure SET sonic character at moderate power levels. The Suara Mk2 Toroid uses four output tubes in a parallel single-ended Class A configuration producing 50 watts per channel, extending the current reserve and dynamic headroom for use with more demanding loudspeakers and larger rooms. The Suono Mk2 is the right choice for listeners who value the traditional SET presentation and work with efficient speakers; the Suara Mk2 suits those who want the same sonic character in a system scaled for larger spaces.

Can the Suono Mk2 Toroid be biased without professional assistance?

Yes. LAB12 has positioned the bias adjustment trimmers on the top panel of the Suono Mk2 Toroid for easy accessibility. With a digital multimeter and the figures provided in the user documentation, tube bias can be set accurately by the owner without disassembling the amplifier or sending it to a technician. The straightforward manual process makes tube rolling a practical part of ownership rather than a technical obstacle.

Where can I buy the LAB12 Suono Mk2 Toroid in Buffalo, NY?

The LAB12 Suono Mk2 Toroid is available at Vinyl Sound in Buffalo, NY, an authorized LAB12 dealer serving Western New York and the USA. The team at Vinyl Sound can assist with speaker matching, demonstration arrangements, and finish selection between Matte Black and Frozen Silver.