Cayin CS-845A User manual

User's Manual
Vacuum Tube Integrated Amplifier
CS-845A
POWER
ON OFF
A1A2
BIAS SEL.
VACUUM TUBE INTEGRATED AMPLIFIER CS-845A
SELECTOR
0dB
LINE1PRE- IN
LINE2LINE3
VO LUM E
MI N MAX
NFB.
-3dB

Table of Contents
Thanks for choosing CAYIN CS-845A Integrated Amplifier and please read the user's manual
carefully before installation and operation.
In order to prevent damage during transportation, the amplifier is packed with protective foams surrounding
the tubes. Before installation and operation, please remove these foams to avoid any risks.
Vacuum Tube
Table of Contents
Package Contents…………………………………………………………………………………………………………2
Product Features…………………………………………………………………………………………………………3
Safety Precautions………………………………………………………………………………………………………3
Specifications………………………………………………………………………………………………………………4
Maintenance………………………………………………………………………………………………………………5
Warranty Service…………………………………………………………………………………………………………5
Precautions…………………………………………………………………………………………………………………6
Front Panel…………………………………………………………………………………………………………………7
Rear Panel…………………………………………………………………………………………………………………8
Top Panel……………………………………………………………………………………………………………………9
Remote Control…………………………………………………………………………………………………………10
Installation………………………………………………………………………………………………………………11
Tube Replacement ……………………………………………………………………………………………………11
Audio Connection………………………………………………………………………………………………………12
Speaker Connection……………………………………………………………………………………………………13
Turn on……………………………………………………………………………………………………………………14
Small Tips…………………………………………………………………………………………………………………14
Troubleshooting ………………………………………………………………………………………………………15
……………………………………………………………………………………………… 1…………
1

Please carefully check the package first and then open it.
Package contents include:
1. CAYIN CS-845A 1 piece
2. Main Fuse 2 pieces
3. Power cord 1 piece
4. Remote Control 1 piece
5. (AAA) Battery of 1.5V 2 pieces
6. Users' Manual 1 piece
Please make sure local voltage level is matched with the input level of the amplifier, which indicates on the rear
panel. Too low or too high voltage may cause problem. Please contact our company or our local agent if you've found
improper voltage.
Recommendation:
Keep all packing materials for future use .
CAYIN CS-845A Vacuum Tube Amplifier is designed and manufactured with our original parts and
reaching the best results. We are not responsible for problems and damages caused by non-original parts
replacement in the amplifier.
Integrated
NOTE:
2
Package Contents
All other parts except above are not included.
NOTE:

1. Unplug the power cord if you are not going to use the product for an extended period of time.
2. The machine will become hot after working for a long time. Please keep the unit's ventilation open and
install the amplifier at a well-ventilated place to avoid troubles and fire hazard.
3. Forbidden to operate when the output is open or shorted.
4. Do not attempt to service this product yourself. Opening the cover may expose you to dangerous
voltage or other hazards.
5. We are not responsible for any problems caused by checking and opening without permission of our
company. For service, Please contact a qualified service technician.
6. Do not place any objects filled with liquids such as vases or some others on the top or around.
7. Clean only with dry cloth.
8. Please move the amplifier carefully not to drop the unit or be subject to other strong shocks.
3
Product Features
Safety Precautions
◆ Hand-made construction with the finest point-to-point wiring.
◆ Two EI output transformer with wide bandwidth are applied.
◆ Specially designed toroid transformer for power supply.
◆ WE6SN7 has been used for voltage amplification.
◆ 300B with Porcelain base has been used for drive amplification.
◆ 845 vacuum tube has been used for Single-end Class A amplification.
◆ Switchable between different negative feedbacks. It outputs soft, clean, original sound if
operated at -3dB NFB. Otherwise it output open, bold sound in details if operated at 0dB NFB.
◆ External 300B Hum Balance Adjustment is accessible.
◆ External user BIAS Adjustment is accessible with the BIAS meter for monitoring on the top of
the amplifier.
◆ Equipped with remote control.
◆ Can be used as a Power Amplifier.
◆ CS-845A can memorize last operation of the unit once turned off.
◆ With high voltage delay function.
◆ High-quality Japanese ALPS motor potentiometer.
◆ Thickly silver plated signal cable has been used.
◆ Equipped with easily-installed tube cover for protection.
vacuum tube
vacuum tube

4
Specifications
Power Output
24W+24W
Frequency Response
10Hz~26kHz (-3dB)
THD
0.3% (1W/1kHz;5% Under Rated Power)
S/N Ratio
90dB
Input Sensitivity
300mV (Integrated)
1300mV (Pre-IN)
Input Impedance
100kΩ
Output Impedance
4Ω, 8Ω
Input Terminals
LINE1,LINE2,LINE3,PRE-IN
Tube
WE6SN7×2、300B×2、845×2
WDH
420mm×389mm×240mm
Net Weight
37kg
Max Power Consumption
380W
Working Condition
Temperature：0℃～40℃ Moisture：20%～80%
Storage Condition
Temperature：-20℃～70℃ Moisture：20%～90%
◆ To reduce the risk of electric shock, do not remove the cover.
◆ No user serviceable parts inside. Refer servicing to qualified service
personnel.
◆ To reduce the risk of fire or electronic shock, do not expose the unit to
rain or moisture.
The lightning flash with arrowhead symbol is intended to alert user to the presence of uninsulated
“dangerous voltage” within the product's enclosure that may be of a risk shock to persons.
The exclamation point is intended to alert user to the presence of important operation and maintenance
(servicing) instructions accompanying the appliance.

Warranty Service
1.This product is warranted for a period of twelve months beginning from the date of purchase.
2.The defective product must be returned to your dealer or our company for repairing when your dealer or our
company accepts your requirement.
3.The warranty doesn't extend to any product that has been opened by you without permission of our company.
Maintenance
5
NOTE:
◆
◆ Do not use any chemicals for cleaning.
Use the soft dry cloth to clean up the chassis regularly.
The information in this manual is subject to change without
further notice.
NOTE:
POWER
ON OFF
A1A2
BIAS SEL.
VACUUM TUBE INTEGRATED AMPLIFIER CS-845A
SELECTOR
0dB
LINE1PRE- IN
LINE2LINE3
VO LUM E
MI N MAX
NFB.
-3dB

Precautions
◆ Connect the power only after finishing other connections.
◆ It is normal that power transformer becomes hot for extended period of operation.
◆ Unplug the power cord if you're not going to use the product for an extended period of time.
◆Please make sure corresponding voltage is the same as required. We are not responsible for damage caused by misuse
of unsuitable voltage.
6
Connection of power cord:
Connect the speaker cables and signal cables first and then insert the power cord into the power socket.
NOTE:
YALIDA YN-401
Connected to AC INPUT
Connected to power socket
INPUT
LINE1LINE2LINE3PRE-IN RIGHT SPEAKER OUTPUT LEFT SPEAKER OUTPUT
T3.15AL250V
OUTPUT
TAPE OUT 230V 50Hz 380W

7
Front Panel
1.
2. Power indicator
Turn on the amplifier the power indicator will be
on.
3.
5.
6.
7.
Power Switch
Used to switch on/off the amplifier.
Note: Unplug the power cord if you're not going to
use the product for an extended period of time.
NFB. Selector
Used to choose NFB.0dB or NFB.-3dB
Power Indicator/Mute Indicator
Used to indicate the working state. The indicator
will be on when it is working normally. The
indicator will flicker for 30 seconds when it delays
to work. The indicator will keep flickering when it
is at mute state.
Volume Knob
Used to control volume
Input Selector Knob
You can hear sound from LINE1 when LINE1
indicator is on.
Bias Selector Switch(A1、A2)
Used to select corresponding tube for bias
adjustment.Bias Adjustment Switch(A1、A2)
4. Switch
You can hear sound from LINE2 when LINE2
indicator is on.
You can hear sound from LINE3 when LINE3
indicator is on.
You can hear sound from PRE-IN when PRE-IN
indicator is on.
Cayin CS-845A can memorize last operation of
the unit once turned off.
The NFB.-3dB indicator will be on when it is
-3dB；
Cayin CS-845A can memorize last operation of
the unit once turned off.
IR Remote Sensor
Used to receive the code of remote control.
working state.
Input Selector Button
Used to select four kinds of audio sources.The
input selection indicator will be on according to
the input audio sources.This function can be
operated on the remote control.
NFB.Indicator：
9.
10.
8.
The NFB.0dB indicator will be on when it is 0dB。
79 1 62
POWER
ON OFF
A1A2
BIAS SEL.
VACUUM TUBE INTEGRATED AMPLIFIER CS-845A
SELECTOR
0dB
LINE1PRE- IN
LINE2LINE3
VO LUM E
MI N MAX
NFB.
-3dB
3 4 5 8 1 0

8
Rear Panel
1.
3.
4.
5.
Signal Input Terminal
Used for audio source input.
2. Signal output Terminal
Used for audio source output.
Right Channel Output
Used to connect with the right channel of speaker.
Left Channel Output
Used to connect with the left channel of speaker.
Power Socket with Main Fuse
Main fuse is located just below the power socket.
Replace the fuse with the same type and value.
1 3 4 5
INPUT
LINE1LINE2LINE3PRE-IN RIGHT SPEAKER OUTPUT LEFT SPEAKER OUTPUT
T3.15AL250V
OUTPUT
TAPE OUT 230V 50Hz 380W
2

Top Panel
9
1.Be careful of the high temperature of the tubes during operation.
2.Replace the tubes carefully and correctly.
3.Power tubes must be matched for well function.
NOTE:
.
2.A1、A2:845 Tube
3.
4.V1、V3:WE6SN7 Tube
5.V2、V4:300B Tube
6.
1 HUM BALANCE Adjustment Switch
Used to adjust bias of corresponding power
tube(A1、A2)
Bias Meter
Used to monitor the working current of the
power tube.
How to adjust the HUM:
Turn the volume knob to the minimum or mute
and adjust the HUM BALANCE with the flat
screwdriver until you heard the smallest HUM.
Do the same for adjusting the other channel.
Bias adjustment for the power tube:
Turn the Bias Selector Switch to its opposite
direction without releasing it, adjust the
corresponding Bias Adjustment Switch with flat
screwdriver, and inspect the Bias Meter on the
top panel to make sure the pointer keeps in the
center. Bias adjustment for A1 A2 are the same.
After all have been adjusted, do it one more time
to make sure all the bias levels of A1,A2 are the
same.
Sample of bias adjustment for power tube A1:
1. Turn the Bias Selector Switch A1 to its opposite
direction without releasing it.
2. Adjust the corresponding Bias Adjustment Switch
A1 with flat screwdriver until the pointer of the
bias meter keeps in the center.
3. Adjustment for A2 are the same.
A
Diagram 5
Bias meter during working
Note: When working normally,
the pointer should stay within
the A zone, still , it would move
for the voltage fluctuation.
Diagram 4
Bias meter when not working
V2V4
V1V3
HUM BAL.
A1
HUM BAL.
A2
A1A2
BIAS ADJ.
A1
BIAS ADJ.
A2
45 1 3 61
2 2

10
Remote Control
1. NFB.
2. Audio Source Input Selector
3. Mute Button
4. Volume Control Selector
Selector
Effective Distance：about 6m
◆Don't drop the remote control. Keep the remote control dry.
◆
◆
◆
◆
Replace the batteries timely.
Don't mix new and old batteries together and use the
batteries with the same specification.
Take out the batteries if you don't use the remote control for
an extended period of time.
Batteries with high quality are recommended.
NOTE:
1
2
3
4
Installation
1. Place the remote control upside up. Screw the rear
cover open with the screwdriver.
2. Pull out the battery case carefully (do not break the
wires connected).
3. Put in the batteries with correct polarity.
4. Push in the battery case and screw the rear cover
close.
POWER
ON OFF
A1A2
BIAS SEL.
VACUUM TUBE INTEGRATED AMPLIFIER CS-845A
SELECTOR
0dB
LINE1PRE- IN
LINE2LINE3
VOLU M E
MIN MA X
NFB.
-3dB

Carefully read and follow the manual for installation:
◆
produce heat.
◆ In order to avoid being overheated please keep the unit's ventilation open.
◆ Do not expose this appliance to rain or moisture.
◆ Keep the amplifier in a certain distance so that it can be easily connected.
◆ Amplifier should install steadily and make sure all four feet are on the same level.
◆ Keep the amplifier over 15cm's distance to the surrounding walls.
Do not place the machine near heat sources such as radiators, heat registers or other products that
Installation
11
Please make sure local voltage level is matched with
the input level of the amplifier, which indicates on the
rear panel. Too low or too high voltage may cause
problems or shorten the amplifier's life.
NOTE:
Tube Replacement
Tubes for the Machine
Tube Replacement
WE6SN7
6SN7GT、6H8C、ECC32、6N8P
300B
300B
845
845

12
Audio Connection
Connection method of CAYIN CS-845A with other audio equipments Take pictures below for your reference.
To audio output terminal
Wrong connection
Right connection
NOTE:
Please refer to the manuals of other connected equipments during the installation.
Do not insert the power cord into the main socket before all other equipments are well
connected.
R refers to right channel while L represents left channel.
Please take the right guidance for connection as wrong connection may cause noise,
low-grade function or damage.
Do not fasten signal cable together with power cable and speaker cables. It will worsen
the acoustic fidelity.
•
•
•
•
•
INPUT
LINE1LINE2LINE3PRE-IN RIGHT SPEAKER OUTPUT LEFT SPEAKER OUTPUT
T3.15AL250V
OUTPUT
TAPE OUT 230V 50Hz 380W

Speaker Connection
13
Check the impedance of your speakers:
Attach the positive from your speaker to the 4 or 8 ohm terminal and the negative to the 0 ohm terminals
separately. If your speakers are 6 ohm, 4 ohm or 8 ohm (recommended) terminal is preferential and it would not
cause damage to the amplifier.Connecting the left and right speakers according to the guidance can make sure
of the acoustic fidelity.
Connection of speaker cables:
1. Unscrew the terminal knob
2. Insert the speaker cable
3. Screw the terminal knob
Speaker(left)Speaker(Right)
Black
Red
Black
Red
Connect the speaker cables with the amplifier after it is
well connected with the speakers.
• Connect both of the speakers to make sure of the
acoustic fidelity.
• Please notice the signal direction indication of the cables.
• Do not mix up the positive and negative ends of speaker
cables or it will cause short circuit.
•
NOTE:
Banana plug Normal plug
INPUT
LINE1LINE2LINE3PRE-IN RIGHT SPEAKER OUTPUT LEFT SPEAKER OUTPUT
T3.15AL250V
OUTPUT
TAPE OUT 230V 50Hz 380W

14
Turning On
Before turning on the amplifier please make sure all connections are right and power supply is stable.
• Turn on the amplifier, the power indicator will be on and the working indicator will keep flickering.
• The working indicator will be on after 30 seconds. It means that the amplifier is working normally. If the
working indicator is off, please turn off the power and contact with our local agent or our company.
• Select the right audio source channel, adjust the volume to a certain position and then you can enjoy the
music you prefer.
1. When the audio system is under working state, don't
unplug the signal cable or speaker cables, or it will
cause damage to the amplifier and other equipments.
2. It should at least takes 2 minutes before you turn on the
power again, or it will cause damage to the vacuum
tubes.
NOTE:
Read the Manual —— Please read the user's manual carefully before installation and operation.
Keep the Manual —— Please keep the manual for future reference.
Warning Signs —— Don't tear off or rub off the serial number.
Operation —— Do the operations as you are instructed in the Manual.
Parts —— If you are going to use parts not supplied by our company like power cord, fuses etc please make
sure that parts you used are compatible with the safety requirements. Or it will cause fire or electric
shock.
Placement —— Put the amplifier on a level place. Make sure that it doesn't bring damage to the children,
adults and the amplifier itself.
Power —— Please make sure the local voltage is the same level as indicated on the rear panel.
Overload —— If the power socket is overloaded with other equipment, it will cause fire or electric shock.
Warranty Service —— Do not open the product and change the components inside yourself. Opening the
cover may expose you to dangerous voltage or other hazards. The warranty doesn't
extend to any product that has been opened by you without permission of our
company.
Troubleshooting —— If any problems when you are using the product, please check according to following
tips to look for the exact reason. Please contact with our company if you can't solve
the problem.
Small T i ps

15
Please follow the instruction in the manual in order to keep the amplifier work in its best state. If wrongly
operated and you thought that would be troubles please check according to following tips to look for the exact
reasons.
Troubleshooting
NOTE: is the registered trademark of Zhuhai Spark Electronic Equipment Co., Ltd.
Problem
Cause
Remedy
NO OUTPUT
Power Indicator is
OFF.
Power cord is not well-connected.
Check power cable connection or
power outlet connection
Main fuse is out.
Replace with the same type
and value fuse.
Troubles of inner parts or components.
Please contact with local
agents or our company.
Power Indicator is
ON.
Volume is at ZERO.
Turn up the Volume.
NO signal input.
Check the function of the
sound source.
Check the input selection and
switch to the proper input.
Sound Distortion
High input signal level.
Turn down the volume to
suitable position.
Noise output
Ground of input signal cable is open
or bad contact of the input signal cable.
Replace the input signal
cable with a new one.
Components or circuits are in trouble.
Please contact with local
agents or our company.
Sound field Positioning
is not so good.
Signal input cables or speaker
cables are wrongly connected.
Reconnect it as suggested in
the manual.
Malfunction of Remote
Control
Be disturbed.
Keep away from the source of
disturbance. Turn off and restore.
Low Battery.
Replace with new batteries.
Obstacles between the amplifier and
remote.
Remove the obstacles.