ICON AUDIO MB30 single ended KT150 mono blocks


SKU: MB30-KT150

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The MB30SE is a versatile high quality very simple mono block amplifier for FullRange and medium sensitivity speakers.

Using only 2 audio valves it has excellent bandwidth with the best qualities of SE* without the disadvantages of flabby bass, hum and low power that many designs suffer.


The new KT120 was chosen for its all round qualities and good power. It is also considerably cheaper than vintage triodes like the 300B which will only deliver 9W SE. The heart of a good Single Ended amplifier is the output transformer. The specially developed Low Distortion Tertiary transformers allow the KT120 to really “sing” without constriction giving wide bandwidth and dynamics with excellent detail.

The MB30 is optimised for Triode and UL operation. 16 Watts being ample for most situations. Especially with the new “Full Range M” speakers and other designs such as Lowther and Fostex being ideal. But recognising that there are many speakers that require more power the MB30 works very well in “Ultralinear” mode allowing the full potential of the KT120 to work its magic.

Designed to be used either an active or passive pre amplifier, or direct from a single source.

The “easy bias” meters ensure that that amplifier is giving its best performance and also gives an indication of output power used. Very useful when you may need to know if you are likely to approach the maximum available power.

Ideal for: most situations where larger SE power is required by someone wanting a very relaxed sound. Well suited to larger more efficient speakers.

Pro’s: Relatively low power consumption. Economical valve replacement cost. Low maintenance design.

Con’s: If high volume and heavy bass is required, a larger more efficient speaker would be better.

Specifications and Features

• 100% Pure Class A output power
• Class A, all Triode front end
• Valve rectifier, GZ34/5AR4
• Output power Triode (16W). Ultralinear (27W)
• Oversized choke regulated power supply
• 1x KT120 output valve (KT88/90 compatible)
• 1x 6SN7 (CV181) double triode driving valve
• All hand wired point to point
• Signal to noise level -86db
• Freq resp 20 – 20kHz +0 –0.8db 45kHz -3db(8w)
• THD typically less than 0.5% 1khz (8w)
• 4 & 8 ohm loudspeaker taps
• Low feedback design (no feedback on high gain)
• Solen/SCR hi fi audio capacitors Jensen upgrade
• Silver plated copper PTFE audio cable
• Tertiary winding output transformers
• Big custom wound PSU Choke
• Gold plated Input & speaker terminals
• 330mv (high) & 925mv (low) input sensitivity.
• 220/240volts 85w approx (each)
• Size in mm W160, D380, H210, 12kg ea
• Packed 44cm x 25cm x 32cm 13kg 2 boxes
Typical values @ 235v AC (Specifications subject to change)

*SINGLE ENDED: is where only one output valve is used so the one valve has to “push and pull” on its own. Although this limits the power available, the lack of “phase splitter” stage required by “push pull” amps means that the mid-range and upper frequencies have less “processing” which gives a smoothness and charm to the sound not found in other designs.

100% Pure Class “A”: Because both the driver and output valves are drawing 50% of power even at zero volume, the valves never “switch off” or go into a “low” state. This thermal and power stability enhances the reproduction of macro dynamics and sound stage spaciousness.

MB30 Leaflet


SKU MB30-KT150
Shipping Weight 26.0000kg
Shipping Width 0.450m
Shipping Height 0.320m
Shipping Length 0.520m
Shipping Cubic 0.074880000m3

12 months manufacturers warranty

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