Cayin LA-34 User manual

Vacuum Tube Integrated Amplifier
LA-34
VACUUM TUBE INTEGRATED AMPLIFIER LA-34
VOLUME
MIN MAX
CD
AUX1
AUX2
SELECTOR
User's Manual
REV：1.1

Table of Contents
Thanks for choosing Cayin LA-34 Vacuum Tube 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.
Integrated
Table of Contents
How to Install Vacuum Tubes…………………………………………………………………………………………15
………………………………………………………………………………… 1
…………………………………………………………………………………………………………2
……………………………………………………………………………………………………………3
…………………………………………………………………………………………………………3
………………………………………………………………………………………………………………4
Maintenance…………………………………………………………………………………………………………………5
……………………………………………………………………………………………………………5
…………………………………………………………………………………………………………………6
…………………………………………………………………………………………………………………7
…………………………………………………………………………………………………………………8
……………………………………………………………………………………………………………………9
…………………………………………………………………………………………………………………10
………………………………………………………………………………………………………10
…………………………………………………………………………………………………………11
………………………………………………………………………………………………………12
…………………………………………………………………………………………………………………13
Small Tips …………………………………………………………………………………………………………………13
…………………………………………………………………………………………………………14
………………………
Package Contents
Product Features
Safety Precautions
Specifications
Warranty Service
Precautions
Front Panel
Rear Panel
Top Panel
Installation
Tube Replacement
Audio Connection
Speaker Connection
Turning on
Troubleshooting
1

Please carefully check the package first and then open it.
Package contents include:
1. Cayin LA-34 1 piece；
2. Main Fuse 2 pieces（100~120V T3.15A250V; 220~240V T2A250V)
3. Power cord 1 piece；
4. User's 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 LA-34 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
◆ Hand-made construction with the finest point-to-point wiring.
◆ Two EI output transformers with wide bandwidth are applied.
◆ Specially designed toroid transformer for power supply.
◆ 5BK7A tubes are used in the preamp stage.
◆ Four EL34 tubes are used for AB1 push-pull amplification.
◆ External user Bias Adjustment is accessible with BIAS TEST POINT.
◆ High-quality Japanese ALPS potentiometer.
◆ Equipped with easily-installed tube cover for protection.
Product Features
Safety precautions

4
Power Output
Frequency Response
THD
S/N Ratio
Input Sensitivity
Input Impedance
Output Impedance
Max Power Consumption
Tube
W D H
Net Weight
Working Condition
Storage Condition
× ×
32W+32W
10Hz～42kHz(-3dB)
1% (1kHz)
9dB
260mV
100kΩ
4Ω，8Ω
5BK7A×3、EL34 4
Temperature °C °C Moisture
Temperature °C °C Moisture
8
260W
330×272×180mm³
13.5kg
0 40 20% 80%
-20 70 20% 90%
×
~ ~
~ ~
Specifications
◆ 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.
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN

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.
NOTE:
◆
◆
Use the soft dry cloth to clean up the chassis regularly.
Do not use any chemicals for cleaning.
Maintenance
5
The information in this manual is subject to change
without further notice.
NOTE:
VACUUM TUBE INTEGRATED AMPLIFIER LA-34
VOLUME
MIN MAX
CD
AUX1
AUX2
SELECTOR

Precautions
YALIDA YN-401
◆ 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 cable first and then insert the power cord into the power socket.
Connected to AC Input
NOTE:
Connected to the power socket
T2.5AL250V
SPEAKER OUTPUTRIGHT SPEAKER OUTPUTLEFT
48 4 8 260
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD. LA-34
CD AUX1AUX2
INPUT

7
Front Panel
1. Power Switch
Used to switch on/off the amplifier.
2.Volume Knob
Used to control volume
3. Power indicator
When starting up, the indicator light.
4. Input Selector
Used to choose 3 types of audio sources.
You can hear sound from CD when CD indicator is on.
You can hear sound from AUX1 when AUX1 indicator is on.
You can hear sound from AUX2 when AUX2 indicator is on.
234 1
VACUUM TUBE INTEGRATED AMPLIFIER LA-34
VOLUME
MIN MAX
CD
AUX1
AUX2
SELECTOR
POWER
ON
OFF

8
Rear Panel
1. Signal Input Terminal
Used for audio source input.
2. Right Channel Output
Used to connect with the right channel of speaker.
3. Left Channel Output
Used to connect with the left channel of speaker.
4. Power Socket with Main Fuse
Main fuse is located just below the power socket.
Replace the fuse with the same type as indicated.
134
2
T2.5AL250V
SPEAKER OUTPUTRIGHT SPEAKER OUTPUTLEFT
48 4 8 260
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD. LA-34
CD AUX1AUX2
INPUT

Top Panel
9
②
③A1、A2、A3、A4:EL34
④V1、V2、V3:5BK7A
①Bias Test Point for testing the bias of the
Channel Power Tube(A1、A2、A3、A4）
Bias Adjustment Knob for Channel Power
Tube(A1、A2、A3、A4)
◆ Be careful of the high temperature of the tubes during operation.
◆ Replace the tubes carefully and correctly.
◆ Power tubes must be matched for well function.
NOTE
EL34 Current Testing
When you’re sure the connections are right, turn it
on by pushing the power button, then the indication
lamp will light up, then wait for about 10 minutes.
Connect the test lead of DC. V meter (or multi-
meter) to the (V1) terminal. Adjust the (V1) Bias Pot
t o m e a s u r e t h e D C . V o l t a g e a r o u n d
0.3V~0.35V(that means the static current is around
30mA~35mA for V1), and do the same procedure for
(V2)(V3)(V4).
Testing the current after using the machine for
about 150 hours can obtain the best state.
3 34
2
1
2
1
A1
A2
A3
A4
V2 5BK7A
BIAS TEST POINT
BIAS ADJ.
A2
A1
+
+-
V V
BIAS ADJ.
A3
A4
POWER TRANSFORMEROUTPUT TRANSFORMER
WIDE FREQUENCY RESPONSE
BIAS TEST POINT
+
+-
V V
OUTPUT TRANSFORMER
WIDE FREQUENCY RESPONSE
Tube Replacement Method:
After turning off the amplifier for about 20
minutes, hold the base of the tube and pull it
out vertically. By replacing different tubes,
you can enjoy different representations of
timbre.
V3 5BK7A
V1 5BK7A

10
Carefully read and follow the manual for installation:
◆ Do not place the machine near heat sources such as radiators, heat registers or other products that 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.
Installation
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.
Tube Replacement
NOTE:
Tubes for the Machine Tubes Replacement
5BK7A
EL34
5BK7-A
EL34、6CA7、6L6、5881

11
Audio Connection
Connection method of Cayin LA-34 with other audio equipments Take pictures below for your reference.
•
•
•
•
•
Pleace 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.
Wrong connection
Right connection
NOTE:
To audio output terminal
T2.5AL250V
SPEAKER OUTPUTRIGHT SPEAKER OUTPUTLEFT
48 4 8 260
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD. LA-34
CD AUX1AUX2
INPUT

12
Speaker Connection
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.
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.
•
•
•
•
1. Unscrew the terminal knob
2. Insert the speaker cable
3. Screw the terminal knob
Check the impedance of your speakers:
NOTE:
Connection of speaker cables:
Banana plug Normal plug
T2.5AL250V
SPEAKER OUTPUTRIGHT SPEAKER OUTPUTLEFT
48 4 8 260
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD. LA-34
CD AUX1AUX2
INPUT
speaker（Left）
speaker（Right）BLACK
RED
BLACK
RED

13
• Turn on the amplifier and the power LED will be on.
It shines and indicates that the amplifier is working.
• If the LED is not on please 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 themusic
you prefer.
Turning On
Before turning on the amplifier please make sure all connections are right and power supply is stable.
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.
Sm all Ti ps

14
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 tip to look for the exact
reason.
NOTE: is the registered trademark of Zhuhai Spark Electronic Equipment Co., Ltd.
Problem Cause Remedy
NO OUTPUT
Power is OFF.Indicator
Power is ON.Indicator
Sound Distortion
Noise output
Sound field Positioning
is not so good.
Power cord is not well-connected.
Main fuse is out.
Troubles of inner parts or components.
Volume is at ZERO.
NO signal input.
High input signal level.
Ground of input signal cable is open
or bad contact of the input signal
cable.
Components or circuits are in trouble.
Signal input cables or speaker
cables are wrongly connected.
Check power cable connection
or power outlet connection
Replace with the same type
and value fuse.
Please contact with local
agents or our company.
Turn up the Volume.
Check the function of the
sound source.
Check the input selection and
switch to the proper input.
Turn down the volume to
suitable .position
Replace the input signal
cable with a new one.
Please contact with local
agents or our company.
Reconnect it as suggested in
the manual.
Troubleshooting

How to Install Vacuum Tubes
Pin No. 9 Pin No.1
How to Install 9-Pin Vacuum Tubes
12AU 7(EC C82)、 1 2AX 7(E CC8 3)
Applicable vacuum tube:
、5BK7、1 2BH7、
12AT7(ECC81)、6922（ECC88), etc. 9-Pin vacuum tubes.
Instructions to Change and Install the vacuum tubes:
To install a nine-pin vacuum tube, align the pins of the vacuum
tube with the holes of the tube socket and insert the tube
vertically up and down (as shown in the figure above).
Please note that when installing the nine-pin vacuum
tube, pay attention to the alignment of the vacuum tube
pins with the holes of the tube socket. Otherwise wrong
insertion will cause damage to the vacuum tube and
prevent the amplifier from working properly, which may
lead to failure of the amplifier.
Positioning Pin
How to Install 8-Pin Vacuum Tubes
Applicable vacuum tube:
KT150、KT170、KT88、6550、EL34、6V6、6SN7、6SL7、5AR4,
etc. 8-pin vacuum tubes.
Instructions to Change and Install the vacuum tubes:
To install an eight-pin vacuum tube, align the positioning pin of
the tube with the grooves in the positioning holes of the tube
socket, and install the tube by pulling up and down vertically
(as shown in the figure above).
Please note that when installing the eight-pin vacuum tube,
pay attention to the alignment of the vacuum tube positioning
pin with the positioning hole of the tube socket. Otherwise
wrong insertion will cause damage to the vacuum tube and
prevent the amplifier from working properly, which may lead to
failure of the amplifier.
How to Install 4-Pin Vacuum Tubes
Applicable vacuum tube:
300B、2A3 etc. 4-pin vacuum tubes .
Instructions to Change and Install the vacuum tubes:
To install a four-pin vacuum tube, please pay attention to the
thickness of differnet pins of the vacuum tube and the size of
the tube socket hole. Thick pin should be aligned with the big
hole, and the thin pin should be aligned with the small hole.
Install the tube vertically up and down (as shown in the figure
above).
Please note that when installing the four-pin vacuum tube,
pay attention to the thickness of differnet pins of the vacuum
tube and the size of the tube socket holes. Otherwise wrong
insertion will cause damage to the vacuum tube and prevent
the amplifier from working properly, which may lead to failure
of the amplifier.
Thin Pin Thick Pin
Big Hole
Small Hole
How to Install Big 4-Pin Vacuum Tubes
Applicable vacuum tube:
845、805、211 etc. 4-pin vacuum tubes.
Instructions to Change and Install the vacuum tubes:
To install the big four-pin vacuum tube, align the vacuum tube
positioning pin with positioning pin slot of the tube socket and
then rotate 45° clockwise to tighten. (As shown in the picture
above). To take out the big four-pin vacuum tube, turn the tube
45° counterclockwise and take it out upward after loosening.
Please note that when installing the big four-pin vacuum
tube, pay attention to the alignment of the vacuum tube
positioning pin with positioning pin slot of the tube socket and
then rotate 45° clockwise to tighten. It is strictly forbidden to
install the vacuum tube when the positioning pin is off or
missing. Otherwise wrong insertion will cause damage to the
vacuum tube and prevent the amplifier from working properly,
which may lead to failure of the amplifier.
Positioning Pin
Positioning Pin Slot
15