Advertisement
Quick Links
MB 805 SE Power Amplifier
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
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.
ABOUT THE SE AMPLIFIER
The MB 805 are Single Ended (SE), this means that
a single valve (805) has to do all the work of both
the "up" and "down" parts of the waveform. In order
to go "down" the valve must be running at 100% of
its' maximum power, unlike push-pull amplifiers
icon Audio
Instruction Manual Covering:
Contents
1 Introduction
MB 805
where the idle current is very low. Unfortunately the
.
drawbacks of this system usually means that the
power is limited to a few watts. We overcome the
power restriction by using the very powerful 805
transmitter valve, for SE amplifiers this has the
advantage that it is able to "swing" more negative
than its sister 845.
As the 805 valve never "switches off" this gives the
smoothest and most detailed mid range of any
amplifier. This gives 100% Pure "Class A" power.
The bass and upper treble can be relatively poor
due to the difficulty in making transformers for this
system. The difficulties in transformer design we
have solved by using our "Tertiary Low Distortion"
transformers that are wound in a complex way by
hand using a third winding to reduce the distortion
generated within the transformer. This makes them
very wide band, with virtually "bottomless" bass.
Running in fixed-bias mode which gives the
maximum power you MUST occasionally check the
bias (say twice a year). The MB 805s are sensitive
enough to be used with any pre-amplifier or a
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
Advertisement
Related Manuals for icon Audio MB 805 SE
Summary of Contents for icon Audio MB 805 SE
-
Page 1: Table Of Contents
Audio Instruction Manual Covering: MB 805 SE Power Amplifier IMPORTANT! THIS MANUAL CONTAINS ESSENTIAL HEALTH & SAFETY INFORMATION FOR YOU AND YOUR AMPLIFIER. PLEASE READ & KEEP SAFE AND REFER TO IF NECESSARY Contents 6 Bias Adjustment 1 Introduction & Final Inspection... - 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 During which the final set up and adjustments were made.
- Page 3 MB805 Layout and Features If you are inserting the MB 805 valve for the first time, it may be helpful to observe the slot in the valve base to indicate the degree of rotation needed to fit the valve correctly. *See engineers notes at rear Page 3...
-
Page 4: Quick Set Up Guide
Audio. Shooting’ 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. -
Page 5: Connecting Inputs & Outputs
‘inside out’ with reduced bass. If you control. This could either be achieved by either a “passive” or powered unit. Icon Audio makes ideal are unable to check this or confirm the polarity (e.g. if you have ‘built in’ wiring), try the following;... -
Page 6: Trouble Shooting
Service: Should you suspect a problem, you could Could be your source, the speakers or the amplifier, return the unit to your dealer or Icon Audio for a check all wiring, and try swapping things around to periodic service or return the valves for testing free of eliminate or prove which component is the problem. -
Page 7: Bias Adjustment
If you are unable to set the reading high enough this means the emission of the valve is low. Icon Audio can test the valve for you, or ideally a matched pair or single valve be substituted*. -
Page 8: Valve Replacement
Generally speaking valve failure may be one of these: 1, The valve continues to work but the emission gets Icon Audio is happy to check the valves/amp or re- low. In the case of output valves this will result in not bias your amp free of charge. -
Page 9: 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. Please contact us. This amplifier is guaranteed by the dealer you... - Page 10 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.