Audio Note M2 RIAA Technical manual

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M2 RIAA
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PHONO STAGE
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OWNER’S INFORMATION
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1) IMPORTANT SAFETY INFORMATION
2) CE DECLARATION OF CONFORMITY
DISPOSAL
POWER REQUIREMENTS
3) INTRODUCTION
4) OVERVIEW
5) UNPACKING AND INSTALLATION
6) CONNECTION
7) OPERATION
8) TECHNICAL SPECIFICATIONS
9) WARRANTY INFORMATION
10) CONTACT INFORMATION
CONTENTS
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OTHER SAFETY PRECAUTIONS: -
Never touch the power cord with wet hands.
Always remove the power cord by grasping the plug, not the cable.
Never expose the unit to excessive heat or magnetism.
Never let an inexperienced person repair or reassemble the unit.
Never put anything, especially metal objects, inside the unit.
Never place excessive weight on the unit.
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Do not store or operate this unit in areas of high humidity or in close
proximity to water / moisture.
Do not expose or immerse the unit in liquid of any kind.
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This product generates high levels of heat. Adequate ventilation must
be provided. Do not restrict airflow through any ventilation slots or
place the unit on any surface that may restrict airflow.
Valve equipment operates at extremely high temperatures;
KEEP OUT OF THE REACH OF CHILDREN AND ANIMALS.!
RISK OF SHOCK OR ELECTROCUTION! INTERNAL OPERATING
VOLTAGES ARE LETHAL!
Do not remove top cover, unless specifically instructed to do so in the user
manual.
This unit contains fuses and other safety components in accordance with
BS60065 requirements.
In the event of failure, replacement fuse or safety component must be of
the same part type and value.
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This product must be earthed –ensure that the mains supply cable earth /
ground is correctly connected.
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SUCH REPLACEMENT MUST ONLY BE CARRIED OUT BY A
QUALIFIED SERVICE TECHNICIAN.
Do not attempt to replace any fuses without first disconnecting the unit
from the mains electricity supply.
! IMPORTANT SAFETY INFORMATION !

POWER REQUIREMENTS
Power requirements for electrical equipment vary depending on your geographical
location. Please ensure that your unit meets the power requirements in your area.
The power requirement for your unit is marked on the serial number plate, located on
the rear panel.
If you are in doubt, please contact your dealer before plugging the unit into the mains
supply.
CE DECLARATION OF CONFORMITY
DISPOSAL
This product must not be disposed of as normal household waste. To
prevent possible harm to the environment please separate the product
from other waste to ensure that it can be recycled in an environmentally
safe manner. Please contact your retailer or the appropriate local
government office for collection facilities.
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We declare under our sole responsibility that this product is in conformity
with the following standards or standardized documents:
BS EN 60065 in accordance with the regulations 73/23/EEC, 89/336/EEC
(from 1 January 1997)
CE 94
Peter Qvortrup,
Director
Audio Note (UK) Limited
25 Montefiore Road
Hove
East Sussex
BN3 1RD
United Kingdom
Tel: [phone]
Fax: [phone]
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Thank you for purchasing this Audio Note (UK) product. With the correct care it
should give you many years of pleasure and enjoyment.
Please take the time to read all of the information in this manual before connecting
your new component to an electrical supply or your system, to ensure both your
safety and satisfaction.
Please note that due to our desire to continually improve products, specifications are
subject to change without notice. Therefore it is important to refer to the manual that
is supplied with your product for the most accurate information; manuals downloaded
from our website or obtained from other sources may no longer fully apply to your
product.
If you have any questions regarding the information contained within this document
or your new component, please feel free to contact us: -
Audio Note (UK) Limited
25 Montefiore Road
Hove
East Sussex
BN3 1RD
United Kingdom
Tel: [phone]
Fax: [phone]
e-mail: [email protected]o.uk
INTRODUCTION

Congratulations on your purchase of the Audio Note (UK) M2 RIAA phono stage.
It has been specifically engineered for sonic performance rather than technical
specification, and fulfills all Audio Note (UK) Level 2 criteria: -
Pure Class A operation
Zero negative feedback
Single Ended circuit topology
Valve rectification
Materials and component quality
It is well known that the accurate reproduction of music, not just sound, requires the
purity of the incoming signal to be preserved. It is therefore not difficult to conclude
that, in order to achieve this goal and to retain the musicality of the original
performance,the complexity of the circuitry itself must be kept to a minimum.
In response to this, the M2 RIAA phono stage uses a single-ended, zero feedback
circuit topology. This is simply the most linear design possible, demanding pure
Class A valve operation and removing the need for a phase splitter, which introduces
unnecessary crossover distortion.
In contrast to the majority of the audio industry, we design our circuits with the aim of
minimising non-harmonic and time base anomalies, rather than producing
vanishingly small harmonic or low intermodulation distortion measurements. These
non-harmonic amplitude and time base distortions have a highly perceptible and
adverse affect on the signal waveform, and it is far more important to address these
factors than participate in the increasingly irrelevant numbers game that chases
‘perfect measured response’.
As a result, the M2 RIAA phono stage was designed for maximum linearity and
minimum transient distortion, and avoids the need for detrimental ‘corrective’
measures, such as inherently error-prone feedback loops.
The M2 RIAA phono stage features an ECC83 and 6DJ8 Moving Magnet phono
stage, and a valve rectified power supply incorporating a 6X5 and an ECL82.
M2 RIAA PHONO STAGE

Please take care when unpacking your M2 RIAA phono stage. Choose a clean, clear
location to unpack your unit. Be aware that the Pre Amplifier is quite heavy; before
attempting to unpack or lift the unit, check the weight and if necessary use more than
one person so that it can be moved safely and easily.
We recommend that you retain and carefully store all of the original packing
materials, in case transportation / shipping is required at a later date.
Select a suitable location for the unit. This should be a dry, dust free and level area,
preferably shielded from direct sunlight and free from vibration. Also ensure that the
location is stable and capable of carrying the weight of the unit.
A suitable mains power outlet must be close to the location; power cords must not be
pulled or stretched tightly in an attempt to reach a wall socket. If the power cord will
not easily reach the socket, choose a closer location!
Please ensure that adequate ventilation for the unit is provided, and that airflow
through any ventilation slots in the unit is not restricted. We recommend a distance of
at least 20cm free space is maintained above the unit. Please also remember that
valve equipment operates at extremely high temperatures, so a position that is
inaccessible to children or animals is essential.
UNPACKING AND INSTALLATION

Phono input Connect the cables from your tonearm to the ‘Input’ sockets. The
inputs are colour coded; RED is for RIGHT channel connection,
WHITE is for LEFT channel connection. If your Turntable is equipped
with a separate earth wire, connect this to the dedicated grounding /
earth post, located in between the Right input socket and the Output
sockets.
If you wish to use a low output Moving Coil (MC) cartridge,
Audio Note (UK) manufactures a series of Step Up Transformers for
this purpose. For further information, please contact your Audio Note
(UK) Dealer, or alternatively please contact us directly.
Mains The M2 RIAA phono stage uses an IEC 320 mains inlet socket. Use
the supplied mains cable to connect the unit to the local mains supply.
The mains fuse and a spare is located in the inlet socket fuse drawer.
Special Note –Make sure that all connectionsare tight and clean. For
best results use good quality audio interconnects. Although it is
perfectly acceptable to use cables manufactured by other companies,
for best results and performance, we recommend our own Audio Note
(UK) range of interconnects and loudspeaker cables. For further
information, please consult your nearest Audio Note (UK) dealer, or
alternatively please feel free to contact us directly.
Outputs The M2 RIAA phono stage provides two unbalanced outputs,
consisting of two pairs of colour coded RCA / Single Ended sockets.
RED is for RIGHT channel connection, WHITE is for LEFT channel
connection.
RCA The two pairs of RCA / Single Ended outputs are for connection to a
power amplifier and are identical, making them suitable for bi-amping.
CONNECTION
RCA SOCKET,
CENTRE = POSITIVE / SEND.
RCA SOCKET,
SHELL = NEGATIVE / RETURN.

OPERATION
Once all the connections are completed and checked, ensure that the volume control
on the following preamplifier or integrated amplifier is at the minimum setting (rotated
all the way left).
Ensure that power supply for the turntable connected to the M2 RIAA phono
stage is switched ON. Source components should always be the FIRST
components to be switched on and the LAST components to be switched off.
Ensure that all pre and power amplifiers connected to the M2 RIAA phono
stage are switched OFF. Any power amplifiers in use should be the LAST
components to be switched on, and the FIRST components to be switched off.
The above procedure minimizes the possibility of loud noises produced by
components at switch on being passed to the loudspeakers and possibly causing
damage.
Turn on the M2 RIAA phono stage by using the rocker switch located on the rear
panel, above the mains inlet IEC socket.
Turn on your pre amplifier / power amplifier / integrated amplifier. If you are using a
pre / power combination, always turn on the pre amplifier BEFORE the power
amplifier(s).
The M2 RIAA phono stage is now ready for operation!
Bedding in The M2 RIAA phono stage requires around 100 hours of initial
use (called “bedding in”) before the circuitry becomes stable
and optimum performance is realized. As the device “beds in”
the sound will become increasingly more smooth, detailed and
open. A warm up time of approximately 30 minutes is required
each time the device is switched on before optimum sonic
performance is reached.
Cleaning No special maintenance is required for the M2 RIAA phono
stage. Use a soft, clean lint free cloth to remove any surface
marks from the casework. For finger marks / grease, use a soft,
clean lint free cloth, lightly moistened with a solution of warm
water and mild detergent. Do not use any alcohol or solvent
based cleaning products, as they may damage the finish.
ENSURE THAT THE DEVICE IS SWITCHED OFF AND
DISCONNECTED FROM THE MAINS ELECTRICITY
SUPPLY BEFORE UNDERTAKING ANY CLEANING.
Valve Life The valves supplied with your M2 RIAA phono stage should
provide approximately 4 years of operation. They are specially
selected by us, and should only be replaced with valves of the
same type and specification. Please consult your Audio Note
(UK) dealer should your valves need replacing. Alternatively,
feel free to contact us directly.

TECHNICAL SPECIFICATIONS
INPUT IMPEDANCE
47 KOhms Phono
INPUT SENSITIVITY
126mV for 1V Output
OUTPUT IMPEDANCE
<10 Ohms
TUBE COMPLIMENT
1 x 6DJ8
1 x ECC83
1 x 6X5
1 x ECL82
FUSE RATINGS
1A anti-surge (110 / 120V supply)
500mA anti-surge (220 / 240V supply)
MAX. POWER CONSUMPTION
55 Watts
UNIT WEIGHT
7 KG
SHIPPING WEIGHT
(ORIGINAL PACKAGING)
10 KG
UNIT DIMENSIONS
140mm (h) x 295mm (w) x 450mm (d)
SHIPPING DIMENSIONS
(ORIGINAL PACKAGING)
240mm (h) x 400mm (w) x 550mm (d)
NOTE
Due to Audio Note (UK)’s ongoing research and
development program, specifications are subject
to change without notice.

Audio Note (UK) warrants this product to be free from defects in materials and
workmanship for two yearsfrom the original date of purchase from an appointed
Audio Note (UK) dealer, and agrees to cover the cost of parts and associated labour
required to correct such defects, subject to terms & conditions.
This Warranty is offered to the first purchaser only.
Any valves supplied with the unit are warranted for three months from the original
date of purchase.
If the product fails in normal domestic use and during the Warranty period due to the
above described faults or defects, Audio Note (UK) will,at its discretion, repair or
replace the item free of charge within a reasonable time once it has been returned to
Audio Note (UK) or an appointed Audio Note (UK) dealer or service engineer.
Audio Note (UK) is not liable for any shipping charges incurred whilst transporting the
product to or from Audio Note (UK) or an appointed Audio Note (UK) dealer or
service engineer, should the item require service or repair during or after the
Warranty period.
If the product must be shipped, please use the original packaging materials and
include a copy of the original sales receipt along with a note explaining, in as much
detail as possible, the problems you are experiencing with the unit.
Only use a reputable Courier Service or Shipping Agent, and ensure that your
product is insured during transit.
Any servicing, repairs or modificationsnot authorized by Audio Note (UK), or
carried out by persons other than appointed Audio Note (UK) service
engineers will invalidate any warranty.
This Warranty does NOT cover: -
Damage sustained whilst in the possession of a shipping agent, retailer or consumer
and not caused as a direct result of defects in materials or workmanship.
Damage caused by normal wear and tear.
Damage or defects caused by abnormal or unreasonable use.
Damage caused by accident, acts of nature, misuse or neglect.
Damage caused by a failure to follow the operating and installation instructions
supplied with the product.
Damage caused by improper or careless cleaning.
Audio Note (UK) reserves the right to refuse warranty for any component of which
the serial number has been removed, defaced or tampered with.
WARRANTY INFORMATION

Audio Note (UK) Limited
25 Montefiore Road
Hove
East Sussex
BN3 1RD
United Kingdom
Tel: [phone]
Fax: [phone]
e-mail: [email protected]o.uk
CONTACT INFORMATION
If in the future your Audio Note (UK) product
requires servicing, or if you require technical support
or have any questions regarding this or any of our
other products, please contact your local Audio Note
(UK) dealer.
Alternatively, please feel free to contact us directly: -!