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icon Audio MB 845 MK IIm Instruction Manual
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icon Audio MB 845 MK IIm Instruction Manual

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MB 845 MK IIm Power Amplifiers
IMPORTANT!
THIS MANUAL CONTAINS
ESSENTIAL HEALTH &
SAFETY INFORMATION FOR
YOU AND YOUR AMPLIFIER.
PLEASE READ & KEEP SAFE
AND REFER TO IF NECESSARY
1 Introduction & Final Inspection
Thank you for purchasing the
MK II
. These pure 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 hand
wound using low oxygen copper and special
Japanese long grain iron. Finally each amplifier is
valved, carefully commissioned and tweaked for
best performance in Leicester UK.
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.
icon Audio
Instruction Manual for:
Shown with upgraded driver valves
Contents
1 Introduction
MB 845
The
amplifiers using the fabulous 845 high power triode
valves. These have very special characteristics
which many people consider give the finest
reproduction of any valves. Similar to the 300B but
with more power and punch. These are in fixed-bias
mode which gives maximum power, cool running
and low distortion. You MUST occasionally check
the bias (at least twice a year). The driver and phase
splitting are also triode for best sound quality and
low noise. The MB 845s 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.
8 Specifications
MB 845
are push-pull all triode power

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Summary of Contents for icon Audio MB 845 MK IIm

  • Page 1: Table Of Contents

    Audio Instruction Manual for: MB 845 MK IIm Power Amplifiers IMPORTANT! THIS MANUAL CONTAINS ESSENTIAL HEALTH & SAFETY INFORMATION FOR YOU AND YOUR AMPLIFIER. PLEASE READ & KEEP SAFE Shown with upgraded driver valves AND REFER TO IF NECESSARY Contents 1 Introduction &...
  • Page 2 V1 whilst reading V1). If there is NO reading at all or the reading is too high and cannot be adjusted, there is a fault, contact your dealer or Icon Audio for guidance.
  • Page 3 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 ……………………………...
  • Page 4 MB845 MK IIm Layout and Features Page 4 *See engineers notes at rear...

  • Page 5: Quick Set Up Guide

    Audio. section or contact Icon Audio. 1 Unpack each unit carefully. Make sure that it is in good condition. If not report to Icon Audio or 6a Sensitivity Switch Located on the rear, this switch is “UP” (H) for your dealer. It is important that you keep the packaging for warranty/service return/shipping.

  • Page 6: Connecting Inputs & Outputs

    Otherwise the sound will be ‘out of phase’ with the sound stage Icon Audio can advise you. Either of our highly ‘inside out’ with reduced bass. If you are unable rated PS1 MM/MC, PS2 MM or PS3 MM/MC all valve phono stages would be an ideal partner.

  • Page 7: Trouble Shooting

    7. Service: Should you suspect a problem, you could bias. No bias reading means either a fuse blown or a return the unit to your dealer or Icon Audio for a faulty valve. Distorted sound at higher volumes may be periodic service or return the valves for testing free of because one of the output 845 valves is not working.

  • Page 8: Bias Adjustment

    5. Valve Testing: If you suspect any of the valves are not working correctly Icon Audio will test the valves at no charge. Return them to us well packed in a rigid box with a note detailing the problem, which valves you suspect and your contact details.

  • Page 9: Valve Replacement

    6SL7. If the sound deteriorates after approximately Icon Audio is happy to check the valves/amp or re- 2000hrs (2 years @ 3hr per day) but the amplifier bias your amp free of charge.

  • Page 10: Guarantee

    Thank you for purchasing one of our amplifiers. We guarantee becomes void if the unit has been hope you will be pleased with it. modified in any way not approved by Icon Audio. This amplifier is guaranteed by the dealer you 10 Packing Instructions...
  • Page 11 Engineers Notes These notes are only intended for use by an engineer qualified to work with high voltage triodes like the 845/805. Owners should refer any problems to a dealer or service agent. The amplifier may be inverted by supporting the transformers on non abrasive surface (e.g.