Icon Audio MB90 MKII M Valve Mono Block Amplifiers
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  • Regular price £3,999.00

The Worlds First KT150 Power Amplifier For The New Tung Sol KT150 Valve


One of our best-selling power amplifiers offering excellent all round value in terms of power, quality and specification. Designed around the superb new Tung Sol KT150 or KT120. Our specially designed LDT transformers get the best out of both valves. As a “modern” design it is at the cutting edge of what is possible from high end valve amplifiers. In this case a heavy duty individual power supply. The venerable “Leak” inspired driver circuit updated to match the performance of the KT150 and our in-house designed output transformers with our unique design of Tertiary (balanced) windings. The hi fi press has been unanimous with praise for the MB90 and ST60 (integrated) design.

Designed for modern less efficient speakers this amplifier gives a fast yet very smooth musical quality to the high power available, making them very versatile in their application.

Pure Triode mode has equal emphasis here. Customer feedback indicates that 80% of customers listen to Triode mode most of the time. The sonic characteristics of the KT150 are a little fluid and warmer when used in this way. The MB90 is a very cost effective way of getting a large 60 watts Triode output without the expense of large Triode valves. This is an ideal replacement for a larger transistor amplifier for someone wanting a more easy listening presentation.

The combination of medium/low feedback, Triode/UL and 4/8 ohms output means that a wide range of pre-amps, speakers and room conditions may be accommodated.


Summary: Ideal alternative to powerful solid state amp. These excel in every way with high power low distortion deep bass transparent highs. But retaining the sound of a thoroughbred classic valve amplifier.

  • Comprehensive manual supplied
  • All hand wired point to point
  • Class A, all Triode front end
  • Output Ultralinear (115W) or Triode (60W)*
  • 4x KT150/K120 matched valves
  • KT88/90 compatible (when de-rated)
  • 1x 6SL7 2x 6SN7 driving valves
  • Signal to noise level -90db
  • Frequency response 20hz-20kHz +0 – 0.5db
  • THD typically less than 0.1% 1khz 8w
  • 4 & 8 ohm loudspeaker taps
  • Valve cover included in the price
  • Solen hi fi audio capacitors
  • Silver PTFE audio cable
  • Tertiary winding output transformers
  • Big custom wound PSU Choke
  • Gold plated Input & speaker terminals
  • 400mv (high) & 1200mv (low) input sensitivity
  • Input impedance 100k
  • 230/240volts 200watts approx
  • Consumption: 38w standby, 88w zero vol, 200w Max
  • C E, ROHS

Size 22cmW, 50D, 21H ( 23cm inc cover), 20kg ea

(Specifications subject to change, errors & omissions excepted. General July 2018)

We have several deomonstation areas in both of our branches. Please give us a call on 03435236169 or email support@kronosav.com to enquire about hearing products at your local branch. 

Please always contact us before to make sure the product(s) are available

Express Deliveries

Express Delivery is FREE on all orders over £50. Express Delivery offers delivery in 24-72 hours from time of purchase. We use premium couriers for this service, mainly DPD & Royal Mail. DPD will offer you a one hour window for delivery to make sure someone is at home, or you can reschedule the delivery if no one is around. 

Standard Deliveries

Here at Kronos AV, we have vast experience with e-commerce sales. Making sure that your parcel arrives undamaged is a huge priority for us. That’s why at Kronos AV, we only use premium couriers for all our orders. All our parcels are shipped with DPD or Royal Mail and are always sent Signed For to make sure it gets to the right person. 

If for any reason your parcel does arrived damaged, please get in touch, and we will be happy to get everything resolved for you. We are always on hand to help!


Delivery is FREE on all orders over £50. In order to offer FREE delivery to UK customers, we use several premium couriers to ensure your delivery arrives safe.

Most large orders (over 2kg) ship using DPD or DHL courier and smaller orders (under 2kg) by Royal Mail signed for services.

The most appropriate courier will be chosen for the items ordered to ensure the quickest possible delivery.

We can offer very generous trade in offers across the majority of our product range. 

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If you have any question, please feel free to call us on 03435236169 or email support@kronosav.com