Doshi Audio Evolution Monoblock Amplifiers (Pair) - Reference Class A Power

The Doshi Evolution Monoblock Amplifiers redefine expectations of valve amplification, delivering a massive 160 watts per channel in pure Class A operation from four KT150 tubes per chassis. These reference monoblocks achieve the speed, eerily black backgrounds, dynamics and bass slam typically associated with the finest solid-state amplifiers, whilst preserving the shape and texture of transients, colour of timbre, and humanity of voices that define exceptional valve performance. With microprocessor control, front-panel push-button bias adjustment, and comprehensive protection systems, the Evolution Monoblocks combine state-of-the-art performance with user-friendly operation.

Reserve your Evolution Monoblock Amplifiers today to experience the ultimate expression of Doshi Audio's amplification philosophy.

Key Features

• 160 watts per channel in pure Class A operation
• Four KT150 power tubes per monoblock chassis
• Microprocessor control with comprehensive protection systems
• Front-panel push-button bias adjustment for easy maintenance
• Larger power transformer with passive power factor correction
• Schottky rectifiers and enlarged power supply capacitors
• Custom ClarityCap CMR capacitors throughout
• Aluminium constrained layer top plate for superior vibration isolation

Uncompromising Power Supply Architecture

Building upon the worldwide acclaim of the V3 Monoblocks, the Evolution embodies significant power supply improvements that fundamentally enhance performance. The larger transformer provides increased current reserves, whilst passive power factor correction ensures clean, efficient power delivery. Schottky rectifiers offer superior switching characteristics compared to conventional diodes, reducing noise and improving dynamics. The substantially enlarged power supply capacitors create deeper energy reserves, enabling the Evolution Monoblocks to maintain absolute control during the most demanding musical passages whilst preserving the eerily black background from which music emerges.

Advanced Circuit Refinement

The Evolution's redesigned input and driver circuitry achieves lower feedback and higher bandwidth than its predecessor, contributing to the amplifier's exceptional speed and transparency. This refined topology allows the Evolution Monoblocks to compete with the very best solid-state amplifiers in terms of transient response and resolution, whilst the KT150 output stage maintains the dimensional soundstaging and harmonic richness of Class A valve operation. The strategic implementation of custom ClarityCap CMR capacitors at critical circuit points further reduces distortion and enhances musical clarity.

The Power of KT150 Valves

Each Evolution Monoblock harnesses four KT150 tubes - currently the most powerful production audio valve available. These remarkable tubes combine exceptional linearity with massive power handling capability, enabling 160 watts of pure Class A operation. In Class A, the output valves conduct continuously throughout the entire signal cycle, eliminating crossover distortion and preserving even the subtlest musical details. The result is amplification that combines stunning power with delicate finesse, capable of driving any loudspeaker whilst maintaining the purity of a single-ended triode.

Intelligent Control Systems

The Evolution Monoblocks feature microprocessor control with comprehensive protection systems, ensuring optimal performance and long-term reliability. Front-panel push-button bias adjustment makes valve maintenance straightforward - no meters or tools required. The microprocessor continuously monitors operating parameters, protecting both the amplifiers and connected equipment from fault conditions. This sophisticated control system allows users to enjoy the sublime performance of Class A valve amplification without the complexity traditionally associated with high-power tube amplifiers.

Musical Excellence Meets Technical Prowess

The unique circuit design enables these monoblocks to achieve seemingly contradictory goals - the speed, black backgrounds, dynamics and bass slam of exceptional solid-state amplification combined with the textural beauty and humanity of valves. Transients possess genuine shape and texture rather than mere speed. Timbre displays natural colour and complexity. Voices convey genuine humanity and emotion. This isn't about choosing between technical excellence and musical beauty - the Evolution Monoblocks deliver both without compromise.

Mechanical Refinement

The new aluminium constrained layer top plate provides superior vibration isolation, ensuring that mechanical resonances never compromise the pristine signal path. Combined with the substantial construction required to support the massive power supplies and output transformers, each monoblock represents a masterpiece of mechanical and electrical engineering. The Evolution Monoblocks' imposing physical presence reflects the uncompromising approach to every aspect of their design.

Recording Heritage Informs Design

Nick Doshi's background as a recording engineer profoundly influences the Evolution Monoblocks' design priorities. Having captured countless live performances, Doshi understands that true musical magic lies not just in accuracy but in preserving the emotional connection between performer and listener. The Evolution Monoblocks embody this philosophy, combining the technical excellence required for accurate reproduction with the musical insight that brings performances to life.

Technical Specifications

• Power Output: 160 watts per channel, Class A
• Output Valves: Four KT150 tubes per monoblock
• Power Supply: Larger transformer with passive power factor correction
• Rectification: Schottky rectifiers
• Capacitors: Enlarged power supply capacitors, custom ClarityCap CMR in signal path
• Control System: Microprocessor control with protection systems
• Bias Adjustment: Front-panel push-button system
• Vibration Control: Aluminium constrained layer top plate
• Topology: Redesigned input/driver circuitry for lower feedback, higher bandwidth

The Ultimate Expression

The Evolution Monoblock Amplifiers represent Doshi Audio's ultimate expression of what valve amplification can achieve. By combining massive Class A power with sophisticated control systems and refined circuit design, these amplifiers will change your perception of tube amplifier capabilities. Whether reproducing the delicate decay of a piano note or the full power of a symphony orchestra, the Evolution Monoblocks maintain absolute control whilst preserving the beauty and magic that makes music emotionally engaging.

Transform your system with Evolution Monoblock Amplifiers - contact Martins Hi-Fi to arrange a private demonstration of these exceptional amplifiers.