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ICON AUDIO MB 90 MKII
Monophonic tube power amplifier. 1 x 50W.
Valve output: 1 X 805 (EACH CHANNEL)
Price per pair
Used product (Overhauled and in good working order)
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Icon Audio MB90 MK IIm: Power and Musicality with KT120 Tubes
The new Tung-Sol KT120 tube has revolutionized the Hi-Fi world, earning its place as the king of pentodes, replacing the legendary GEC KT88 from 1957.
The MB90 MK IIm is a high-performance power amplifier, designed to operate in both triode and ultralinear mode, allowing users to select their preferred balance of power and sonic character.
In addition to circuit and aesthetic improvements, this new version incorporates an "Easy Bias" meter, making tube bias adjustment incredibly simple. Instead of checking figures, users simply need to align the needle with the black mark—it's that easy!
British-Inspired Design
The MB90 MK IIm draws inspiration from classic British amplifiers such as the Leak/Mullard designs of the 1950s, offering a smooth, musical, and balanced sound while taking full advantage of its high power output.
Thanks to our exclusive LDT tertiary-wound output transformers, this amplifier delivers:
Enhanced dynamics and macro-dynamics
Greater depth and a three-dimensional soundstage
Extended bandwidth with improved clarity and detail
Pure, warm tonal balance with zero listening fatigue
This amplifier is the perfect alternative for those looking to replace high-power solid-state amplifiers, while still enjoying the speed and precision of modern sound—but with the warmth and naturalness that only vacuum tubes can offer.
Technical Specifications
Design & Construction
New design optimized for KT120 tubes
Simplified bias adjustment with "Easy Bias" system
Hand-wired, point-to-point construction
Copper alloy top plate for improved heat dissipation
LDT tertiary-wound output transformers
Tube Configuration
4 x KT120 (per pair)
2 x 6SL7 + 2 x 6SN7 (driver tubes per pair)
Output Power
Ultralinear Mode: 110W per channel
Triode Mode: 60W per channel
Power Supply
High-capacity power supply with custom choke
Tube voltage regulation for improved stability
Sound Quality & Frequency Response
Signal-to-noise ratio: -90 dB
Total Harmonic Distortion (THD):
< 0.1% @ 1 kHz
Frequency Response:
20 Hz – 20 kHz (+0 / -0.5 dB)
Connectivity
Speaker terminals for 4Ω and 8Ω
Gold-plated input and speaker terminals
High-Quality Components
High-fidelity SCR audio capacitors
PTFE-insulated, pure silver-plated copper internal wiring
Input Sensitivity
450 mV (high sensitivity mode)
950 mV (low sensitivity mode)
Power Supply & Energy Consumption
Operating Voltage: 230/240V
Power Consumption:
38W (standby)
88W (idle)
200W (maximum)
Dimensions & Weight
Width: 200 mm
Depth: 500 mm
Height:
220 mm (without tube cover)
222 mm (with tube cover)
Weight: 21 kg per unit
Included Accessories
Aesthetically designed tube cover
Comprehensive manual with detailed instructions
Certifications
CE-certified, ROHS compliant
The Ultimate KT120 Power Amplifier
The Icon Audio MB90 MK IIm is a powerful, versatile, and musical amplifier, designed to extract the very best from KT120 tubes.
With its handcrafted construction, robust power supply, and the ability to switch between triode and ultralinear mode, this amplifier is the ideal choice for those seeking high power without sacrificing the warmth and natural sound of tube amplification.
If you desire dynamics, detail, and an immersive, fatigue-free listening experience, the MB90 MK IIm is the perfect addition to your high-fidelity system.
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