LAB12 Mighty Class-A Single-Ended Tube Amplifier at Vinyl Sound Buffalo NY

The Mighty is a single-ended Class A tube amplifier from LAB12 (Athens, Greece), available at Vinyl Sound in Buffalo, NY. Producing 10 watts per channel from EL34 power pentodes in a pure single-ended Class A circuit, it is designed for high-efficiency loudspeaker systems where the immediacy, tonal presence, and natural flow of SET amplification can be fully expressed without the compromise of a high-power push-pull design. Switchable triode and ultralinear operating modes refine the sonic character to match the listener's preferences, and LAB12's SRSG grounding and Fine Symmetry layout are applied throughout. The Mighty was selected for the Editor's Choice 2025 Low-Power SET Amplifier Award by HiFiClube, recognizing its design excellence and emotional musical engagement.

Pure Single-Ended Class A Design

The Mighty operates in Class A throughout its power range, meaning the output tube is continuously biased to conduct for the full 360 degrees of the audio waveform regardless of signal level. This eliminates crossover distortion entirely, the most audibly objectionable artifact in Class AB designs at low power levels, and results in a presentation that feels immediate, tonal, and free of grain from the first watt. The single-ended output topology, in which a single output tube per channel drives the output transformer directly, produces the characteristic harmonic structure associated with the finest SET amplifiers: a fundamental accompanied by even-order harmonics that listeners consistently describe as natural and musical rather than electronic. The 10-watt output, while modest by push-pull standards, is adequate for loudspeakers with sensitivity ratings of 90 dB or higher in typical listening rooms, which encompasses the majority of high-efficiency designs from Klipsch, Zu Audio, Totem Acoustic, and other compatible brands.

Triode and Ultralinear Mode Selection with SRSG and Fine Symmetry

The front-panel triode and ultralinear mode selector allows the Mighty to be adapted to different speakers and musical preferences without modifying the circuit. In triode mode, the EL34's screen grid is connected to the plate, reducing output power and bandwidth while intensifying the harmonic density and tonal intimacy of the presentation. In ultralinear mode, the screen grid is tapped into the output transformer, recovering power, extending bandwidth, and tightening bass control. LAB12's SRSG (Separate Rails Separate Grounds) implementation maintains full separation between signal and power ground planes throughout the circuit, reducing the noise floor to a level where the single-ended output stage can operate in silence. The Fine Symmetry layout ensures that both channels track each other with precision, preserving stereo image accuracy.

Key Features

• Single-Ended Class A Output Stage: A true single-ended circuit operating in Class A for the full dynamic range, delivering the characteristic tonal density and natural harmonic structure of the finest SET designs.
• EL34 Output Tubes (factory-installed): Factory-installed EL34 power pentodes; compatible with 6550 and KT88 for tube rolling.
• Triode / Ultralinear Mode Selector: Front-panel switch provides direct access to two distinct operating modes.
• No-Feedback Design: Zero global negative feedback for an open, natural, 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 output level monitoring.
• Precision 5mm Aluminum Panel: CNC-machined face panel in Matte Black with a glass-blasted anodized finish and a five-year manufacturer guarantee.

Technical Specifications

Awards and Critical Recognition

• Editor's Choice 2025, Low-Power SET Amplifier Award – HiFiClube

Frequently Asked Questions

What is the LAB12 Mighty?

The LAB12 Mighty is a single-ended Class A tube amplifier from Athens, Greece, producing 10 watts per channel from EL34 power pentodes with selectable triode and ultralinear modes. It features a no-feedback circuit, SRSG grounding, Fine Symmetry layout, analog Nissei VU meters, and compatibility with 6550 and KT88 output tubes in addition to the factory-installed EL34s, all in a compact Matte Black 5mm aluminum chassis with a five-year guarantee. It received the Editor's Choice 2025 Low-Power SET Amplifier Award from HiFiClube.

How does the Mighty compare to the Leben CS-300XS?

The LAB12 Mighty and the Leben CS-300XS are both compact single-ended Class A tube amplifiers intended for high-efficiency speaker systems, and both command strong followings among SET enthusiasts. The Leben CS-300XS uses EL84 output tubes producing approximately 15 watts per channel in ultralinear mode, includes a built-in phono stage and headphone output, and is celebrated for its warm, musical presentation with exceptional midrange density. The LAB12 Mighty uses EL34 output tubes for 10 watts per channel, offers triode and ultralinear mode switching, and is compatible with 6550 and KT88 output tubes for broader tonal exploration. The Mighty's SRSG grounding and Fine Symmetry topology give it a quieter background than is typical in this class, while the EL34's naturally extended frequency response suits a wider variety of loudspeakers than the EL84-based Leben.

What loudspeakers are suitable for the LAB12 Mighty?

The LAB12 Mighty is designed for loudspeakers with sensitivity ratings of 90 dB/W/m and higher, which includes a broad range of high-efficiency designs. Compatible speakers include the Klipsch Heresy IV (99 dB), the Zu Audio Soul Supremo (101 dB), the DALI Rubicon 6 (90 dB), and the Totem Acoustic Hawk (90 dB), among many others. In ultralinear mode, the Mighty's tighter bass control and extended bandwidth make it practical with speakers down to 88 dB in smaller listening spaces. Vinyl Sound in Buffalo can provide specific pairing guidance based on room dimensions and musical preferences.

Can I roll tubes in the LAB12 Mighty?

Yes. The Mighty ships with factory-installed EL34 output pentodes but accepts 6550 and KT88 tubes in the same sockets, allowing the owner to explore meaningfully different sonic characters through tube rolling. The 6550 typically provides tighter bass and greater dynamic authority, while the KT88 offers a balance between EL34 warmth and the 6550's control. The 6N1P input and driver triodes can also be replaced with compatible NOS alternatives for further voicing flexibility. Bias should be checked and adjusted after any output tube change.

Where can I buy the LAB12 Mighty in Buffalo, NY?

The LAB12 Mighty is available at Vinyl Sound in Buffalo, NY, an authorized LAB12 dealer serving Western New York and the USA. Vinyl Sound carries the full LAB12 amplifier and source lineup and can assist with speaker system matching, tube rolling guidance, and in-store demonstration arrangements.