Bakoon SATRI AMP-51R User manual

SATRI AMPLIFIER AMP-51R
Owner’s Manual

SAFETY INSTRUCTIONS 4
INTRODUCTION 6
OVERVIEW (FRONT PANEL) 8
OVERVIEW (REAR PANEL) 9
OVERVIEW (REMOTE CONTROL) 1 1
OPERATION 12
TROUBLESHOOTING 13
SPECIFICATION 14
WARRANTY 15
SAFETY INSTRUCTIONS 4
INTRODUCTION 6
OVERVIEW (FRONT PANEL) 8
OVERVIEW (REAR PANEL) 9
OVERVIEW (REMOTE CONTROL) 1 1
OPERATION 12
TROUBLESHOOTING 13
SPECIFICATION 14
WARRANTY 15
contentscontents

1. Instructions
Thoroughly read through and follow all the safety instructions
stated below before operating or installing any items. It is also
important that you retain the instructions for future reference.
2. Placement
Place the product on a rigid rack or shelf specified to support the
weight of the product. Failure to do so may result in the shelf
breaking, tipping or the product to fall with the risk of causing
serious material and personal injury.
3. Ventilation
The product needs proper ventilation to ensure reliable opera-
tion. Do not place the product in an enclosed, non-ventilated area
such as in a bookcase or closed rack, and on a soft surface such
as sofa or bed.
4. Heat
Do not use the product near flames, any heating appliances such
as radiators, stoves or any other audio amplifiers.
5. Water and Moisture
Do not place the product near any water such as flower vases, air
conditionings or any installations of running water. Also, you may
not pour into nor use any kind of liquids on the product.
6. Cleaning
Disconnect the main plug before cleaning. Clean the product only
with a dry, soft, lint-free cloth or a vacuum cleaner. Do not use any
liquid or chemical cleaners.
7. Power Sources
The product must be connected to the type of power source
specified in the marking labels found on the packaging box or on
the back of the product. Do not modify the supplied power cable
in any way. Do not overload wall outlets, receptacles or extension
cords. Do not place the power cable where there is a risk that it
will be walked on, pinched, bent, exposed to heat or in any way
damaged.
1. Instructions
Thoroughly read through and follow all the safety instructions
stated below before operating or installing any items. It is also
important that you retain the instructions for future reference.
2. Placement
Place the product on a rigid rack or shelf specified to support the
weight of the product. Failure to do so may result in the shelf
breaking, tipping or the product to fall with the risk of causing
serious material and personal injury.
3. Ventilation
The product needs proper ventilation to ensure reliable opera-
tion. Do not place the product in an enclosed, non-ventilated area
such as in a bookcase or closed rack, and on a soft surface such
as sofa or bed.
4. Heat
Do not use the product near flames, any heating appliances such
as radiators, stoves or any other audio amplifiers.
5. Water and Moisture
Do not place the product near any water such as flower vases, air
conditionings or any installations of running water. Also, you may
not pour into nor use any kind of liquids on the product.
6. Cleaning
Disconnect the main plug before cleaning. Clean the product only
with a dry, soft, lint-free cloth or a vacuum cleaner. Do not use any
liquid or chemical cleaners.
7. Power Sources
The product must be connected to the type of power source
specified in the marking labels found on the packaging box or on
the back of the product. Do not modify the supplied power cable
in any way. Do not overload wall outlets, receptacles or extension
cords. Do not place the power cable where there is a risk that it
will be walked on, pinched, bent, exposed to heat or in any way
damaged.
4
SAFETY INSTRUCTIONS
All products from Bakoon International are strictly designed and manufactured to meet the most rigid safety standards.
It is important that owners should follow the below instructions to avoid any possible damages.

8. AC Power Connection
The product must be connected to the power outlet only with
the power cable that meets safety standards. Do not damage or
modify the products’ AC inlet connector or power cable in any
way. Do not overload wall outlets, receptacles or extension cords.
Please refer to the marking label for its AC input specification.
Failure to do so will result in serious damage to the product or the
user and will void the warranty.
9. Damage Requiring Service
The product should be serviced by qualified service personnel if:
●
The power supply cable or plug has been damaged.
●
Objects have fallen or liquid has been spilled into the product.
●
The product has been exposed to rain or water.
●
The product does not operate normally or exhibits a clear
change in performance.
●
The product has been dropped or damaged in any way .
10. Service
You should not attempt to service the product by yourself nor
may it be serviced by any unauthorized service personnel. Always
contact your dealer to arrange servicing. Failure to do so will void
the warranty.
Caution: You should never open the product in order to prevent
electric shock.
Warning: Do not place the product near any water such as flower
vases, air conditionings or any installations of running water. Also,
you may not pour into nor use any kind of liquids on the product.
There is a risk of electric shock.
Caution: The product requires to be installed in a well ventilated
area. The product is designed to dissipate heat through all of its
surface areas, thus requiring at least 20 cm space on all sides. Do
not stack the amplifier directly on top of or below other products.
8. AC Power Connection
The product must be connected to the power outlet only with
the power cable that meets safety standards. Do not damage or
modify the products’ AC inlet connector or power cable in any
way. Do not overload wall outlets, receptacles or extension cords.
Please refer to the marking label for its AC input specification.
Failure to do so will result in serious damage to the product or the
user and will void the warranty.
9. Damage Requiring Service
The product should be serviced by qualified service personnel if:
●
The power supply cable or plug has been damaged.
●
Objects have fallen or liquid has been spilled into the product.
●
The product has been exposed to rain or water.
●
The product does not operate normally or exhibits a clear
change in performance.
●
The product has been dropped or damaged in any way .
10. Service
You should not attempt to service the product by yourself nor
may it be serviced by any unauthorized service personnel. Always
contact your dealer to arrange servicing. Failure to do so will void
the warranty.
Caution: You should never open the product in order to prevent
electric shock.
Warning: Do not place the product near any water such as flower
vases, air conditionings or any installations of running water. Also,
you may not pour into nor use any kind of liquids on the product.
There is a risk of electric shock.
Caution: The product requires to be installed in a well ventilated
area. The product is designed to dissipate heat through all of its
surface areas, thus requiring at least 20 cm space on all sides. Do
not stack the amplifier directly on top of or below other products.
5
1. Instructions
Thoroughly read through and follow all the safety instructions
stated below before operating or installing any items. It is also
important that you retain the instructions for future reference.
2. Placement
Place the product on a rigid rack or shelf specified to support the
weight of the product. Failure to do so may result in the shelf
breaking, tipping or the product to fall with the risk of causing
serious material and personal injury.
3. Ventilation
The product needs proper ventilation to ensure reliable opera-
tion. Do not place the product in an enclosed, non-ventilated area
such as in a bookcase or closed rack, and on a soft surface such
as sofa or bed.
4. Heat
Do not use the product near flames, any heating appliances such
as radiators, stoves or any other audio amplifiers.
5. Water and Moisture
Do not place the product near any water such as flower vases, air
conditionings or any installations of running water. Also, you may
not pour into nor use any kind of liquids on the product.
6. Cleaning
Disconnect the main plug before cleaning. Clean the product only
with a dry, soft, lint-free cloth or a vacuum cleaner. Do not use any
liquid or chemical cleaners.
7. Power Sources
The product must be connected to the type of power source
specified in the marking labels found on the packaging box or on
the back of the product. Do not modify the supplied power cable
in any way. Do not overload wall outlets, receptacles or extension
cords. Do not place the power cable where there is a risk that it
will be walked on, pinched, bent, exposed to heat or in any way
damaged.
1. Instructions
Thoroughly read through and follow all the safety instructions
stated below before operating or installing any items. It is also
important that you retain the instructions for future reference.
2. Placement
Place the product on a rigid rack or shelf specified to support the
weight of the product. Failure to do so may result in the shelf
breaking, tipping or the product to fall with the risk of causing
serious material and personal injury.
3. Ventilation
The product needs proper ventilation to ensure reliable opera-
tion. Do not place the product in an enclosed, non-ventilated area
such as in a bookcase or closed rack, and on a soft surface such
as sofa or bed.
4. Heat
Do not use the product near flames, any heating appliances such
as radiators, stoves or any other audio amplifiers.
5. Water and Moisture
Do not place the product near any water such as flower vases, air
conditionings or any installations of running water. Also, you may
not pour into nor use any kind of liquids on the product.
6. Cleaning
Disconnect the main plug before cleaning. Clean the product only
with a dry, soft, lint-free cloth or a vacuum cleaner. Do not use any
liquid or chemical cleaners.
7. Power Sources
The product must be connected to the type of power source
specified in the marking labels found on the packaging box or on
the back of the product. Do not modify the supplied power cable
in any way. Do not overload wall outlets, receptacles or extension
cords. Do not place the power cable where there is a risk that it
will be walked on, pinched, bent, exposed to heat or in any way
damaged.

INTRODUCTION
Congratulations on becoming a happy owner of the SATRI AMP-51R.
The AMP-51R is our finest achievement to date, our next generation flagship amplifier, born from years of experience and
expertise in SATRI Circuit technology. Created with the highlighted features described below, the AMP-51R ensures the
best quality of music reproduction possible.
6
The All New Flagship SATRI Circuit
The AMP-51R uses our top-of-the-line SATRI-IC-UL and the latest
generation bias control circuit with a more stable current source
circuit that enhances the output stages’ performance. The circuit
is further enhanced by greatly reducing the signal paths and
interference between the components. The latest high power
MOSFETs from EXICON are implemented together with the
exclusive driver circuit which enables a more stable output stage
performance.
Advanced Control Circuit
An all new control circuit contributes to the AMP-51R’s stability by
automatically protecting itself from AC input changes, DC output
and high temperature. It also detects the voltage fluctuations and
controls the power supplies accordingly, so that the amplifier
runs from a stable power supply at all times. An OLED display
shows all the current status of the AMP-51R, and all operation of
the unit is done by two hidden knobs underneath the front panel
or with the remote controller.
Ultra Precision Stepped Attenuator Circuit
The Ultra Precision Stepped Attenuator is implemented for the
first time in a Bakoon amplifier, with only the best available high
precision resistors with 0.1% tolerance and 25 PPM/°C tempera-
ture coecient. The circuit is completely controlled by the micro-
processor unit (MPU) and it can be set in 50 steps, ensuring the
best possible channel balance and signal purity.
Ultra Low Noise Power Supply
Three separate power transformers are used for the input stages,
output stages and control stages. For the first time in a Bakoon’s
amplifier, a custom-made transformer from Plitron, boasting the
lowest possible noise level. The power supply circuit also employs
separate ultra-low noise regulator circuits to provide reliable
power for the AMP-51R’s high precision circuits.
The All New Flagship SATRI Circuit
The AMP-51R uses our top-of-the-line SATRI-IC-UL and the latest
generation bias control circuit with a more stable current source
circuit that enhances the output stages’ performance. The circuit
is further enhanced by greatly reducing the signal paths and
interference between the components. The latest high power
MOSFETs from EXICON are implemented together with the
exclusive driver circuit which enables a more stable output stage
performance.
Advanced Control Circuit
An all new control circuit contributes to the AMP-51R’s stability by
automatically protecting itself from AC input changes, DC output
and high temperature. It also detects the voltage fluctuations and
controls the power supplies accordingly, so that the amplifier
runs from a stable power supply at all times. An OLED display
shows all the current status of the AMP-51R, and all operation of
the unit is done by two hidden knobs underneath the front panel
or with the remote controller.
Ultra Precision Stepped Attenuator Circuit
The Ultra Precision Stepped Attenuator is implemented for the
first time in a Bakoon amplifier, with only the best available high
precision resistors with 0.1% tolerance and 25 PPM/°C tempera-
ture coecient. The circuit is completely controlled by the micro-
processor unit (MPU) and it can be set in 50 steps, ensuring the
best possible channel balance and signal purity.
Ultra Low Noise Power Supply
Three separate power transformers are used for the input stages,
output stages and control stages. For the first time in a Bakoon’s
amplifier, a custom-made transformer from Plitron, boasting the
lowest possible noise level. The power supply circuit also employs
separate ultra-low noise regulator circuits to provide reliable
power for the AMP-51R’s high precision circuits.
INTRODUCTION
Congratulations on becoming a happy owner of the SATRI AMP-51R.
The AMP-51R is our finest achievement to date, our next generation flagship amplifier, born from years of experience and
expertise in SATRI Circuit technology. Created with the highlighted features described below, the AMP-51R ensures the
best quality of music reproduction possible.

Extreme Mechanical Engineering
Bakoon’s expertise in mechanical engineering delivers a precise,
yet beautifully finished case design – both inside and out. In order
to transfer heat from the circuits more eciently, there are two
CNC machined copper heatsink blocks inside. Also, various
heatsink patterns are machined throughout the exterior surfaces.
The case itself is stabilized by three isolation feet, designed and
positioned from meticulous calculations for the best
anti-vibration performance.
Packaging
Inside the packaging box, you will find the below contents;
● AMP-51R Amplifier
● Remote Controller
● Remote Controller Battery Replacement Toolkit
● Owner’s Manual / Safety Instruction
● A Pair of Gloves
The original packaging box has been created to carefully protect
its contents.
Please do not throw away the box in case of possible shipments
in the future.
Extreme Mechanical Engineering
Bakoon’s expertise in mechanical engineering delivers a precise,
yet beautifully finished case design – both inside and out. In order
to transfer heat from the circuits more eciently, there are two
CNC machined copper heatsink blocks inside. Also, various
heatsink patterns are machined throughout the exterior surfaces.
The case itself is stabilized by three isolation feet, designed and
positioned from meticulous calculations for the best
anti-vibration performance.
Packaging
Inside the packaging box, you will find the below contents;
● AMP-51R Amplifier
● Remote Controller
● Remote Controller Battery Replacement Toolkit
● Owner’s Manual / Safety Instruction
● A Pair of Gloves
The original packaging box has been created to carefully protect
its contents.
Please do not throw away the box in case of possible shipments
in the future.
7

➊
INPUT SELECT
Underneath the front panel, there is a knob with which you can switch
between and select input sources. Rotate it left or right swiftly, but
gently, to change the input. During the input change, the gain level is
automatically changed to zero (mute), after which it is then returned
to its last position step.
➋
POWER & GAIN
The power and gain control is combined with one single knob. With
the AC power cable plugged in, the AMP-51R goes into standby mode
with a separate standby transformer inside the unit. In standby mode,
rotating the knob swiftly to right will turn on the amplifier and rotating
it further to right will increase its gain level (or volume). Rotating it to
left will decrease its gain level and at the minimum gain level, or step 0,
rotating it swiftly further to left will turn o the unit and put the
amplifier back into standby mode.
Remarks: The latest generation bias circuit inside the AMP-51R stabilizes
its bias level during the initial turn-on period for about 12 seconds.
During this period, the AMP-51R is in mute mode with no signal output.
➌
OLED DISPLAY
The OLED display, will always display the current status of the AMP-
51R’s, and any changes made, the given text will show up at the
display. Also, should the AMP-51 enter into any protection mode, such
as problems from output DC, AC input or high temperature, this will
also be shown on the display.
➍
IR SENSOR
The small IR sensor located next to the OLED display receives the
remote controller’s signal. Be careful not to block its way.
➊
INPUT SELECT
Underneath the front panel, there is a knob with which you can switch
between and select input sources. Rotate it left or right swiftly, but
gently, to change the input. During the input change, the gain level is
automatically changed to zero (mute), after which it is then returned
to its last position step.
➋
POWER & GAIN
The power and gain control is combined with one single knob. With
the AC power cable plugged in, the AMP-51R goes into standby mode
with a separate standby transformer inside the unit. In standby mode,
rotating the knob swiftly to right will turn on the amplifier and rotating
it further to right will increase its gain level (or volume). Rotating it to
left will decrease its gain level and at the minimum gain level, or step 0,
rotating it swiftly further to left will turn o the unit and put the
amplifier back into standby mode.
Remarks: The latest generation bias circuit inside the AMP-51R stabilizes
its bias level during the initial turn-on period for about 12 seconds.
During this period, the AMP-51R is in mute mode with no signal output.
➌
OLED DISPLAY
The OLED display, will always display the current status of the AMP-
51R’s, and any changes made, the given text will show up at the
display. Also, should the AMP-51 enter into any protection mode, such
as problems from output DC, AC input or high temperature, this will
also be shown on the display.
➍
IR SENSOR
The small IR sensor located next to the OLED display receives the
remote controller’s signal. Be careful not to block its way.
8
OVERVIEW (FRONT PANEL)
➋➊
➌➍

OVERVIEW (REAR PANEL)
9
➊
➋
➌
➊
AC POWER INLET
The AC POWER INLET contains an AC power receptacle (IEC
standard) and a fuse holder. Securely connect the AC power cable
here. When replacing the fuse, be sure to use the same type and
value specified on the marking label.
➋
MARKING LABEL
The MARKING LABEL is located under the power inlet. It describes
AC main voltage, power consumption, fuse type and value. Make
sure you check this label carefully before the installation.
Remarks: The AMP-51R incorporates an AC voltage sensing circuit
that detects incoming AC voltage and its according DC output to
automatically help select the AC transformer primary inputs, during
the start-up and when it’s running.
This ensures the best performance at any given AC condition, but if
the AC voltage is either too low (less than 10%) or too high (higher
than 5%), the AMP-51R’s protection circuit will automatically turn o
the amplifier.
➌
LOUDSPEAKER OUTPUT
When playing in the stereo mode, you can connect a pair of loud-
speaker cables to the connectors according to + and – markings.
When playing in mono mode (with two AMP-51Rs), the right channel’s
+ becomes its mono + output and the left channel’s + becomes it
mono – output. Be careful not to touch and make contacts between
any of these connectors during the installation, as this would pose a
risk of damaging the amplifier and the loudspeakers.
➊
AC POWER INLET
The AC POWER INLET contains an AC power receptacle (IEC
standard) and a fuse holder. Securely connect the AC power cable
here. When replacing the fuse, be sure to use the same type and
value specified on the marking label.
➋
MARKING LABEL
The MARKING LABEL is located under the power inlet. It describes
AC main voltage, power consumption, fuse type and value. Make
sure you check this label carefully before the installation.
Remarks: The AMP-51R incorporates an AC voltage sensing circuit
that detects incoming AC voltage and its according DC output to
automatically help select the AC transformer primary inputs, during
the start-up and when it’s running.
This ensures the best performance at any given AC condition, but if
the AC voltage is either too low (less than 10%) or too high (higher
than 5%), the AMP-51R’s protection circuit will automatically turn o
the amplifier.
➌
LOUDSPEAKER OUTPUT
When playing in the stereo mode, you can connect a pair of loud-
speaker cables to the connectors according to + and – markings.
When playing in mono mode (with two AMP-51Rs), the right channel’s
+ becomes its mono + output and the left channel’s + becomes it
mono – output. Be careful not to touch and make contacts between
any of these connectors during the installation, as this would pose a
risk of damaging the amplifier and the loudspeakers.

10
OVERVIEW (REAR PANEL)
➍
➎
➎ ➎
➍
➍
INPUT (STEREO)
There are two sets of conventional voltage inputs (RCA) and two
sets of SATRI-LINK inputs (BNC). Conventional source components
are compatible with the RCA voltage inputs. The SATRI-LINK is used
exclusively for source components by Bakoon.
Remarks: SATRI-LINK is a current signal transfer method between
electronics. It can transfer the signals at very long distances and the
input signal goes directly into the SATRI Circuit without any loss in
signal quality.
➎
INPUT (MONO)
The AMP-51R can be converted to play in mono mode. During its
mono mode, the XLR connector is used for any conventional balanced
voltage source and two BNC connectors, namely the SATRI-2LINK,
are used for Bakoon’s source with balanced current output. In mono
mode, the AMP-51R’s gain level is fixed, requiring that any connected
sources in turn are equipped with a volume controller. (Alternatively
through a preamplifier)
Remarks: The XLR connector’s pin 1 is ground, pin 2 is hot and pin 3
is cold.
Remarks: Do not connect any stereo inputs during the mono mode.
➍
INPUT (STEREO)
There are two sets of conventional voltage inputs (RCA) and two
sets of SATRI-LINK inputs (BNC). Conventional source components
are compatible with the RCA voltage inputs. The SATRI-LINK is used
exclusively for source components by Bakoon.
Remarks: SATRI-LINK is a current signal transfer method between
electronics. It can transfer the signals at very long distances and the
input signal goes directly into the SATRI Circuit without any loss in
signal quality.
➎
INPUT (MONO)
The AMP-51R can be converted to play in mono mode. During its
mono mode, the XLR connector is used for any conventional balanced
voltage source and two BNC connectors, namely the SATRI-2LINK,
are used for Bakoon’s source with balanced current output. In mono
mode, the AMP-51R’s gain level is fixed, requiring that any connected
sources in turn are equipped with a volume controller. (Alternatively
through a preamplifier)
Remarks: The XLR connector’s pin 1 is ground, pin 2 is hot and pin 3
is cold.
Remarks: Do not connect any stereo inputs during the mono mode.