Lejonklou Tundra Mono 3 | Power Amplifier

Single-channel amplification, refined through listening

Lejonklou Tundra Mono 3 is a high-end mono power amplifier evolved through meticulous tuning and thermal control. Music-first Swedish design, curated by Authentic High End.

The Lejonklou Tundra Mono 3 is the result of more than a decade of focused development around one idea: a single channel, executed without compromise, sounds more alive.

The original Tundra Mono, introduced in 2013, was derived from the stereo Tundra power amplifier. While it already shared many of its strengths, the move to a single channel brought something more important than extra power: a clear step up in sound quality. Whether playing softly or loudly, music became more engaging, more expressive, and more convincing.

At Authentic High End, the Tundra Mono 3 represents the pinnacle of Lejonklou’s power amplification philosophy.

Why One Channel Sounds Better

Tundra Mono is not about headline specifications. Its advantage lies in how calmly and consistently it operates under musical load.

Three core design choices make the mono version fundamentally superior to the stereo Tundra:

1. Power Supplies Working in Comfort

The twin power supplies are of the same type as in the stereo Tundra, but in Tundra Mono they only have one channel to feed.
This allows them to run smoother, delivering cleaner and more stable voltages throughout the amplifier. Cleaner voltages mean a more stable foundation for music — especially during dynamic passages.

2. A Much Stronger Drive Stage

The drive stage that controls the output devices is five times more powerful than in the stereo version.
As a result, Tundra Mono is far less affected by how much current a loudspeaker demands at any given moment. This freedom from effort allows the amplifier to express musical dynamics and emotion more convincingly, without strain or hesitation.

3. Improved Thermal Stability

Cooling of critical components is significantly improved. This ensures stability when music transitions rapidly from silence to high output — a moment where timing and control are most easily lost.

From Tundra Mono to Tundra Mono 3

The second major evolution came with Tundra Mono 2, released in February 2015. This was a complete rework, focused primarily on thermal behaviour, which plays a decisive role in musical stability.

Key improvements introduced with Mono 2 — and carried forward into Tundra Mono 3 — include:

• Copper cooling blocks replacing aluminium
  Two pieces of copper with a total weight of 1.2 kg dramatically reduced temperature variations in all critical areas. Less thermal fluctuation means a more stable and predictable musical presentation.

• Torque-optimised clamping of output transistors
  Output devices are clamped between the copper blocks using a spring-loaded mechanism that maintains constant pressure, regardless of temperature changes.

• Advanced Thermal Interface Material (TIM)
  Thermal resistance between components and cooling blocks was reduced to one quarter of the previous value. Faster heat transfer results in audibly tighter, more solid bass and improved overall control.

Status Port & Trim: Long-Term Musical Consistency

In addition to internal refinements, the rear panel of Tundra Mono 2 and 3 received two important additions:

• a Status Port

• a Trim control

These allow compensation for variations caused by:

• ambient temperature

• ventilation (open rack vs closed cabinet)

• long-term component drift over many years

Each pair of Tundra Mono amplifiers is supplied with a calibrated instrument and clear instructions. The trimming procedure is simple and ensures that the amplifier continues to perform at reference level in its specific environment.

Individually Tuned — No Exceptions

Every Tundra Mono 3 is individually fine-tuned.

This process combines precise measurements with extensive listening. An amplifier is not approved for shipment until it performs on par with Lejonklou’s internal reference. This level of attention ensures consistency, longevity and musical integrity across years of use.

Listening Experience

Tundra Mono 3 does not emphasise power or scale.

Instead, it delivers certainty.

Music feels alive at any volume level. Quiet passages remain expressive, while loud passages retain control and composure. Loudspeakers sound less stressed, timing remains intact, and the emotional message of the music comes through clearly and effortlessly.

System Integration

• Mono power amplifier (one unit per channel)

• Analogue RCA input

• Designed to pair with high-quality preamplifiers and source-first systems

• Ideal for demanding loudspeakers and reference-level installations

Once connected, there is nothing to configure — only music to play.

Why We Selected Tundra Mono 3 at Authentic High End

We chose Tundra Mono 3 because it reveals improvements upstream without adding anything of its own. Better sources, better setup and better recordings are immediately audible.

In our Brussels listening rooms, Tundra Mono 3 proves that control, stability and thermal discipline are not technical details — they are musical necessities.

Technical Overview

• Product type: Mono power amplifier

• Architecture: Single-channel design

• Power supplies: Twin supplies dedicated to one channel

• Drive stage: Five-times stronger than stereo Tundra

• Cooling: Dual copper blocks, total 1.2 kg

• Thermal control: Advanced TIM, constant-pressure clamping

• Adjustment: Status Port & Trim control

• Tuning: Individually measured and listened to

• Build: Designed and assembled in Sweden

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