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MB30m
Instruction Manual

Icon Audio MB30m Instruction Manual

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Instruction Manual for:

MB 30m Amplifiers

Shown with upgraded driver valves

Contents

1 Introduction & final inspection

2 Quick set up guide

3 Connecting inputs & outputs

4 Getting the best performance

5 Trouble shooting

6 Bias adjustment

7 Valve replacement

8 Specifications

9 Guarantee

10 Packing instructions

1 Introduction

Thank you for purchasing the

MB30m

valve mono block amplifiers are the result of years

of careful design and listening tests with a wide

range of speakers. The amplifiers are hand built

using carefully selected audiophile components. The

transformers are our own unique LDT Tertiary hand

wound design hand wound using low oxygen copper

and special Japanese long grain iron. Each amplifier

is completed in Leicester, then valved, carefully

commissioned and tweaked for best performance.

In order to get the best out of your amplifier, please

read the “SET UP” notes. These contain important

information about the correct operation and safety.

Should you be uncertain about anything please

contact your dealer or one of our team.

Valve amplifiers do need a little more attention than

their solid-state counterparts, but the sonic results

are well worth it. In this manual we have tried to

include everything that you need to know. Please let

us know if you find any errors or feel that we have

missed anything out.

The

MB30m

is a Single Ended (one output

valve) triode/UL power amplifier designed for the

excellent new KT120 power output valves. Many SE

amplifiers are of low power which limits the choice of

speaker. The new KT120 valve has enabled us to

develop an amplifier which has three times the

power of a single 300B, The MB30 will give ample

volume with most popular loudspeakers in most

situations, with a smoothness and richness that is

often lacking with push-pull designs.

MB30s operate in “fixed-bias” mode which gives

maximum power, cooler running and low distortion.

The MB30s are sensitive enough to be used with

any pre-amplifier or passive in most situations. Their

simplicity coupled with point to point hand wiring

without the use of printed circuit boards results in an

open euphoric sound that is wonderfully detailed

and warm. You MUST occasionally check the bias

this is easy with the built in meter.

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Summary of MB30m

Page 1
Icon audio instruction manual for: mb 30m amplifiers shown with upgraded driver valves contents 1 introduction & final inspection 2 quick set up guide 3 connecting inputs & outputs 4 getting the best performance 5 trouble shooting 6 bias adjustment 7 valve replacement 8 specifications 9 guarantee 10...
Page 2
*see engineers notes at rear page 2 final inspection - your guarantee of quality to assure you of optimum performance and reliability, this amplifier has passed our rigorous final inspection and listening test by the icon audio team in leicester. Date …./…./…. Model ………. Amp serial number ………. Custo...
Page 3: Mb30 Se Layout and Features
*see engineers notes at rear page 3 mb30 se layout and features the mb30s are not particularly sensitive to noise so therefore may be placed close to each other similar to a conventional power amplifier. Or alternatively place adjacent to each loudspeaker in order to keep the loudspeaker cable to a ...
Page 4: 2 Quick Set Up Guide
*see engineers notes at rear page 4 important read these notes through first! 2 quick set up guide your safety is paramount to us. Valve amplifiers like the mb30m operate using high voltages. Please take care when setting up and adjusting. Do not operate without valves fitted. If you are uncertain h...
Page 5
*see engineers notes at rear page 5 3 connecting inputs & outputs many problems associated with electronic equipment involves connecting leads, which are usually either ‘bad connection’ or a ‘wrong connection’ . So it’s worth making sure that you have good connections and that your leads are the rig...
Page 6: 5 Trouble Shooting
*see engineers notes at rear page 6 ‘burning in’ although the amplifier should sound good within about 15 mins it can take up to an hour to sound at its best when new and will take several months of regular use before it is fully ‘run in’. Like the ageing of wine, the biggest change occurs in the fi...
Page 7
*see engineers notes at rear page 7 6 bias adjustment why is bias so important? With pure class a single valve operation the valve must be at 50% of its current. This enables it to increase to 100% and down to 0% at full power as the music waveform demands. Too low and the full power will not be ach...
Page 8: 8 Specification & Features
*see engineers notes at rear page 8 how long do valves last? And how do i know when to replace valves? Valve life will depend upon such things as hours of use and number of on/off cycles. Valve life is impossible to predict as they can suffer from many different faults. As a very rough guide we woul...
Page 9: 9 Guarantee
*see engineers notes at rear page 9 9 guarantee thank you for purchasing one of our amplifiers. We trust you will be pleased with it. This amplifier is guaranteed by the dealer you purchased from for 12 months from the date of purchase for parts and labour, excluding shipping. Valves are consumables...
Page 10
*see engineers notes at rear page 10 engineers notes these notes are only intended for use by an engineer qualified to work with high voltages found in valve amplifiers. Owners should refer any problems to a dealer or service agent. The amplifier may be inverted by supporting the transformers on non...