Cayin HA-3A User manual

User's Manual
HEADPHONE AMPLIFIER
HA-3A
REV：1.0
POWER
STA NDARD
PHONES
4PIN BA L.
STD
4PIN BAL ANCE
L
M
H
IMPEDANCE
4.4 BAL . VOLUME
SOURCES
XLR RCA
MIN MAX
4.4 BALA NCE
HEADPHONE AMPLIFIER HA-3A
ON OFF

Table of Contents
Thank you for choosing Cayin HA-3A Headphone Amplifier
We have inserted protective foam inside the Vacuum Tube Cage in order to protect the vacuum tubes during
transportation. Please remove these foams before you connect the amplifier into your sound system. Fail to do
so might cause serious damage to the amplifier or disaster such as fire accident.
the amplifier. We suggest all customers read through this manual before they start to use the device.
We have prepared this user manual to help you understand the features and get familiar with the operation of
Table of Content ………………… …………………………………………………………
Package Contents ……………………………………………………….……………………………………
Product Features ……………………………………………………………………………………………...
Safety Precautions ……………………………………………………………………………………………
Specifications ……………………………………………………………………………………………….
Daily Care ……………………………………………………………………………………………………...
Warranty Service ………………………………………………………………………………………...
Preparation ……………………………………………………………………………………………….
Front Panel Functional Description …………………………………………………………………….
Rear Panel Functional Description ………… ……………………………………………………….
Top Panel Functional Description …………………………………………………………………...
Installation ………………………………………………………………………………………………...
Va c u u m Tube Su b s t itution … … … … … ……………………… … … … ……………………… … … . ..
Connect to Audio Equipment ………………………………………………………………………...
Connect to Headphones ……… … … … … … … … … … … … …… … … … … … … … … … …… … … . . .
Basic Operation ………………………………………………………………………………………….
M a in t e n an c e … … … …… … … … …… … … … …… … … … …… … …… …… … …… …… … …… …. . .
T r o u b l e s h o o t i n g … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … .
How to Install Vacuum Tubes…………………………………………………………………………
F o l l o w u s … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … … …
……… …………
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Please place the box in upright position according to the marking of the package. Please examine the product
package before you open it, the package should be free from any physical damage or water stain. You should
find the following items when you open the package:
1.Cayin HA-3A x1
2.User's Manual x1
3.AC Power Cord x1
4.Spare Fuses:
①.External Main Fuse x2（～220V-240V：T1AL250V； ～100V-120V：T2AL250V）
②.External Fuse for high voltage x2（T125mAE250V ）
Recommendation
Please keep all packaging materials for future use as you may need to repackage the amplifier in the future.
Please fill in the product warranty card immediately and mail it to authorized dealer to safeguard your after-
sales service.
Note: Please make sure the AC voltage of your local power supply match the voltage information printed on the
back panel before you power up the amplifier. Incorrect input voltage setting will cause damage to the machine
or might even lead to serious household accident. Cayin reserves the right to refuse service or responsibility on
related instances. If the marked voltage is different from your local power supply voltage, please contact your
authorized dealer or Zhuhai Spark Electronic Equipment Co., Ltd.
Attention: the product package should include only the items in the list above.
This amplifier is designed, optimized and manufactured by factory designated components. Cayin reserves the
right to void the warranty of the product in case of unauthorized repair, modification or change to the product,
and we shall not responsible to any failure or damage caused by replacement of non-designated components.
Notice:
2
Package Contents

3
Product Features
◆
craftsman.
◆ Matched-pair custom build EI output transformers.
◆ In-house Designed Premium Toroid Power Transformer with high inductance and high efficiency.
◆ 22DE4 from RCA are used as Tube Rectifier providing stable and clean power supply to the
Voltage Amplification Stage.
◆ Multi-stage independent power supply voltage amplification employs independent regulator
design minimum ripple effect of power interference ensure outstanding audio performance, free
from any grain and hardness.
◆ Dedicated implementation of single-ended amplification circuit offer simple, pure and
devoted music presentation.
◆ JJ 12AU7/ECC82 are used for voltage amplification.
◆ JJ 6V6S are used for power amplification.
◆ Premium grade RealCap coupling capacitor improves resolving capability and soundstage.
◆ High quality Neutrik 6.35mm single-ended headphone, NIPPON DICS 4.4mm balanced
headphone, and Neutrik 4-pin balanced headphone are included.
◆ In -house designed output transformers provide three set of impedance matched outputs (High,
Mid, Low) from 8Ω to 600Ω at your direction.
◆ Two sets of line input XLR balanced RCA single-ended.
◆ Strong output power to match with wide range of headphone in the market.
◆ High performance Alps Potentiometer offers durable, high-precision Volume Control.
◆ Soft start function (about 60 seconds).
◆ Special shielding and anti-shock design.
◆ Design with an innovative circuit layout and highly effective shielding consideration, the
components will function at premium environment to ensure high quality audio performance form
the amplifier.
◆ Equipped with easily-installed tube cover for protection.
Point to point wiring with premium grade of wires. The entire circuitry is hand-wired by skillful

4
◆ 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.
This symbol warns the users that uninsulated voltage within the unit may be sufficient to cause
electrical shock. It is dangerous to make any kind of contact with any part inside the unit.
This symbol alerts the users that important information concerning the operation and maintenance of
this unit has been provided. The information should be read carefully to avoid problems.
1.Unplug the power cord if you are not going to use the amplifier for an extended period of time, and
keep the machine in proper condition.
2.Tube amplifier will built-up its operation temperature after long hours of operation. Please keep the
amplifier at a well-ventilated environment and do not cover the amplifier or blocked the vents. Poor
ventilation will lead to excessively high operation temperature and can cause malfunction or fire.
3.To avoid damaging the amplifier, you must connect a source device to the input terminals before you
select that as the active input of your HA-3A.
4.To avoid damaging the amplifier, short circuit among the output terminals are strictly forbidden.
5.Do not attempt to service this product yourself. Opening the cover may expose you to electric shock or
other hazards.
6.Do not attempt to disassemble the machine. Cayin reserves the right to void the warranty of the
product in case of unauthorized repair, modification or change to the product. All service and
maintenance must be conducted by authorized service technician.
7.The amplifier must be keep away from water dripping or water splitting, do not place any objects filled
with liquids such as vases or some others on the top or around the amplifier.
8.Please disconnect power cable before you attempt to clean the machine. Please use soft clean cloth
to wipe clean the chassis, do not use volatile solution or corrosive to clean product.
9.Please handle with care, avoid tempering to the machine.
Safety precautions

Specifications
5
ITEM
SPECIFICATIONS
【Rated Output】
STD
400mW+400mW（L）；600mW+600mW（M）；700mW+700mW（H）
4.4 BAL.
230mW+230mW（L）；350mW+350mW（M）；400mW+400mW（H）
4PIN BAL.
600mW+600mW（L）；750mW+750mW（M）；850mW+850mW（H）
【 】Frequency Range
18Hz～30kHz ±3dB
【 】TH+D
0.2% (1kHz, 200mW)
【 】Sensitivity
300mV～480mV
【S/N Ratio】
100dB （A-Weighted）
【 】Headphone Impedance
L：8~64Ω； M：65~250Ω； H：251~600Ω
【Headphone Connectors】
6.35mm x1 ；4.4mm BALANCEx1； 4pin XLR x1,
【Input Impedance】
40kΩ
【Input Connector】
XLR,RCA
【Tube used】
JJ 12AU7/ECC82 JJ 6V6S RCA ×2、 ×2、 22DE4×1
【Dimension】
306mm 260mm 170mm× ×
【Net Weight】
12KG
【Fuse】
～220V-240V： ～100V-120VT1AL250V； ：T2AL250V
【External Fuse for 6V6】
T125mAE250V
【Power Consumption】
80W
【Working Condition】
Temp Humidity：0℃～40℃ ：20%～80%
【Storage Condition】
Temp Humidity：-20℃～70℃ ：20%～90%

Warranty Service
1.The Product is warranted for a period of twelve (12) months from the date of original purchase (the “Warranty
Period”). Replacement Products are warranted for the remainder of the original twelve (12) month warranty
period. Six-month warranty on stock vacuum tubes.
2.The defective product must be returned to our authorized agent or Zhuhai Spark Electronic Equipment Co.,
Ltd (the “Company”) for service. You must receive approval from our authorized dealer or the “Company”
before you send out the defective product.
3.Do not attempt to disassemble the machine without prior approval of the “Company” otherwise we reserves
the right to void the warranty of the product
Daily Care
Notice:
◆
◆
Please use soft clean cloth to clean the chassis regularly
Do not use volatile solution or corrosive cleaning product or pre-treated cloth
The information in this manual is subject to change without prior notice.
NOTE:
6
POWER
STA NDARD
PHONES
4PIN BA L.
STD
4PIN BAL ANCE
L
M
H
IMPEDANCE
4.4 BAL . VOLUME
SOURCES
XLR RCA
MIN MAX
4.4 BALA NCE
HEADPHONE AMPLIFIER HA-3A
ON OFF

Precautions
◆Connect power cord after all equipments are well connected.
◆It is normal that the transformers will emit heat when the amplifier is used for long hours
◆Please unplug the power plug if you won’t use the amplifier for a long time
◆Please make sure the AC voltage of your local power supply match the voltage of the amplifier. Cayin
will not be responsible for the damage or accidents such as fire caused by incorrect input voltage
Attention:
Connect to AC
Power Supply
7
Connecting AC Power Cord
Connect the signal cables first and then insert the power cord into the power socket.
ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD.
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
-HA 3A
HEADPHONE AMPLIFIER
RCA
XLR
SOURCES
FUSE
1:G 2:+ 3: - 1:G 2:+ 3 :-
6V6 TUBE
T AL250V1
80
230 50

Front Panel Functional Description
“down” the button to turn on the amplifier, Press
again the button will resume to original position and
the amplifier will power off.
②. : Indicate the working status: The
indicator will remain always on when the amplifier is
in regular operation
③.Headphone Output Selector:
can select the suitable type of headphone output.
HA-3A offers three types output.
④.STANDARD: Output for headphones terminated in
6.35mm TRS connector
⑤.4.4 Balance Output：4.4 balance output for
headphone terminated in 4.4mm connector.
①.
Power Indicator
With the switch you
Power On/Off: Turn on and off the amplifier. Press
⑦.IMPEDANCE: Select the most desirable: impedance-
matched output from the amplifier, three options were
offered: (L:8~64Ω; M:65~250Ω; H: 251~600Ω)
⑧.VU meter: monitor output level of the amplifier
⑨.SOURCES: select balanced or single-ended input
⑩.
.
⑥.4PIN BALANCE: Output for headphones terminated
in 4pins XLR connector
Working State 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.
⑪Volume Knob
Used to control volume
◆
adapter (not included in the package).
◆Listening through headphones at a high volume for extended periods of time can result in hearing
impairments.
◆Please do not use mono (TS) phone plug with this amplifier as this might cause serious damage
such as short circuit in the amplifier.
◆Please unplug the power plug from AC power circuit if the amplifier is not used for a long time
If your want to connect a 3.5mm terminated headphone to the amplifier, you need a 3.5mm to 6.3mm
Attention:
8
Diagram 1：HA-3A Front Panel
Polarity Diagram for 4 PIN XLR
Balanced Headphone Jack
Polarity Diagram for 6.35mm
Headphone Jack.
L-
R-
L+
R+
Polarity Diagram for 4.4mm
Balanced Headphone Jack
12
POWER
STA NDARD
PHONES
4PIN BA L.
STD
4PIN BAL ANCE
L
M
H
IMPEDANCE
4.4 BAL . VOLUME
SOURCES
XLR RCA
MIN MAX
4.4 BALA NCE
HEADPHONE AMPLIFIER HA-3A
ON OFF
46
37
58910 11

Rear Panel Functional Description
Please make sure the AC voltage of your local power supply match the voltage of the amplifier. Cayin
will not be responsible for the damage or accidents such as fire caused by incorrect input voltage
①.
Connect a balanced audio input to the
amplifier. Please make sure the left and
right channel is connected correctly
②.Single-ended input (RCA)
Connect a single-ended audio input to the
amplifier. Please make sure the left and
right channel is connected correctly
③.External Fuse for high voltage
（T160mAL250V）
④.AC Power Input with Fuse Holder: please
replace fuse with the same specification
Balanced input (XLR)
Diagram 2: HA-3A Rear Panel
Attention:
9
T1AL250V
RCA
XLR
SOURCES
珠海斯巴克电子设备有限公司制造
ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD.
用户请勿打开机箱
内部有高压
警 告
名 称 ：
型 号 ：HA 3-
编 号 ：
真空管耳机功率放大器
80
FUSE
1:G 2:+ 3: - 1:G 2:+ 3 :-
6V6 TUBE
1342

Diagram 3: HA-3A Top Panel
Top Panel Functional Description
◆
◆
◆
The vacuum tube will become very hot during operation, please be careful and don’t get burned.
Please turn off the amplifier for 20 minutes before replacing the vacuum tube. Hold the base of vacuum tube
firmly and to avoid damaging the fragile part of the vacuum tube.
When install vacuum tube to the amplifier, position the vacuum tube correctly according to the alignment pin
before push the vacuum tube base into the socket.
Attention:
10
①V5: RCA 22DE4 Vacuum TUBE
②V1、V2: JJ 12AU7/ECC82 Vacuum TUBE
③V3、V4: JJ 6V6 Vacuum TUBE
.
.
.
2
13
V1 V2
V5
V3V4
6V6 6V6
22DE4
/
12AU7 ECC82 / 12AU7 ECC82

Please make sure all associated equipment are in perfect working condition before you install
the amplifier
Please pay attention to the following details when you install the amplifier.
◆Do not place the power amplifier under direct sunlight or near other heat sources.
◆To prevent the amplifier from overheating, please keep the amplifier at a well-ventilated
environment and do not cover the amplifier or blocked the vents.
◆Avoid moisture, keep the amplifier from dust if possible.
◆Make sure the amplifier are setup at a location that can be connected to the AC power
supply and other audio equipment conveniently.
◆Place the amplifier at a flat surface, make sure all four supporting tips are evenly loaded.
◆Please keep amplifier not less than 15cm away from and the wall.
Installation
Vacuum Tube Substitution
11
Vacuum Tube Substitution
22DE4
JJ 12AU7/ECC82
JJ 6V6
RCA 22DE4
12AU7、ECC82、E82CC、ECC802S
6V6

ZHUHAI SPARK ELECTRONIC EQUIPMENT CO., LTD.
RISK OF ELECTRIC SHOCK
CAUTION
DO NOT OPEN
-HA 3A
HEADPHONE AMPLIFIER
RCA
XLR
SOURCES
FUSE
1:G 2:+ 3:- 1:G 2: + 3: -
6V6 TUBE
T AL250V1
80
230 50
CS-100CD
ANALOG OUTPUT DIGITAL OUTPUT
USBCOAXIALOPTICAL
OPTICALCOAXIAL
BALANCEUNBALANCE
RIGHT LEFT RIGHT LEFT
AES/EBU
Connect to Audio Equipment
This section will illustrate how to connect audio equipment to the HA-3A amplifier.
Wrong connection
Right connection
Connect to
Audio Output
HA-3A
CS-100CD
BALANCE Socket：
1. The BALANCE socket is with XLR input. The functions are
following:
Music signal is transferred as balance signal without
the outside disturbance.
Professional XLR connectors are used to raise
reliability of connection.
In the following two systems, professional XLR
connectors are used for inside connection.
◆
◆
2.
3. a This amplifier uses the USA System.
If the XLR balance connector is used by European
system, the restored signal of pre-amplifier or main
amplifier will be inverse. Therefore, please setup the
correct phase in advance.
Attention to Audio Connection:
1.Please refer to the manual of associated
equipment whenever necessary.
2.Do not connect the power cord until all
equipment are properly connected
3. “R”indicates the right channel; “L” indicates
left channel.
4.Please make sure all connectors are securely
installed. Bad connection might cause noise
and degrade in audio performance, or even
damaging your equipment.
5.Please do not tie the power cord, audio
interconnects, and speaker cable together or
run them in parallel because
this will produce adverse
effect on audio performance.
Note: Please make sure + and -, left and right are
connected properly.
12
L
R
R
L
L
R
R
L
a. ：①PIN1：GND;②PIN2：HOT;
③PIN3：COLD
USA System
①
②③
GND
HOT
COLD
b. ：①PIN1：GND; ②PIN2：COLD;
③PIN3：HOT
European System
①
②③
GNDCOLD
HOT

扬声器连接
Selecting Headphone Connection
HA-3A provided three types of headphone output: 4-pins XLR for balanced, 4.4mm Balanced ,6.35mm
for singled-end, we have optimized the headphone amplifier to perform satisfactory for all outputs, user
are free to use any headphone output according to their need without worrying one is better than the
other.
Single-ended Headphone Connection
HA-3A provides one set of 6.35mm headphone input,
the pin definition of the headphone connector is as illustrated.
Headphones terminated with 3.5mm connector will require a 3.5mm
to 6.35mm adapter in order to use it with this headphone amplifier.
4.4mm Balanced Headphone Connection
 HA-3A provides one set of 4.4mm headphone input, the pin
definition of the headphone connector is as illustrated.
 Headphones terminated with 2.5mm connector will require a 2.5mm
to 4.4mm adapter in order to use it with this headphone amplifier.
XLR Balance Headphone Connections
 HA-3A provide one set of 4-pin XLR headphone input, the pin
definition of the XLR connector is as illustrated.
 Headphones terminated with dual XLR (3-pins), 4.4mm or 2.5mm
balanced headphone connectors will require corresponding XLR4
adapter in order to use it with this headphone amplifier.
IMPEDANCE matched output
 Headphones are currently available from 8Ω to 600Ω, in view of this wide range of impedance rating,
HA-3A provides three sets of impedance matched outputs (L:8~64Ω; M:65~250Ω; H: 251~600Ω) to
ensure the headphone amplifier can handle vast variety of headphones satisfactory.
 We recommend users to start with the output setting that match the impedance rating of your
headphone.
 It is technically safe to select any impedance setting for your headphone. You can try other impedance
setting without worrying causing any damage to your headphone.


Connect to Headphones
Attention:
◆
use the 6.35mm headphone output.
◆Single-ended headphone cannot use an adapter to plug into the XLR4 balanced headphone output
of the HA-3A, it can cause damage to your headphone and/or headphone amplifier.
◆Turning the volume to the minimum when you exchange the Headphone.
Balanced headphones can convert into single-ended headphone with appropriate converter and
13
Polarity Diagram for 4 PIN XLR
Balanced Headphone Jack
Polarity Diagram for 6.35mm
Headphone Jack.
L-
R-
L+
R+
Polarity Diagram for 4.4mm
Balanced Headphone Jack

14
Basic Operation
Please make sure all connections are correct and power supply voltage is stable before turn on the amplifier.
1. Turn on the amplifier, the power indicator will light up.
2. When the power indicator remains lighted up steadily, the amplifier is ready for operation. If the power
indicator will become steady (always ON). It means that the amplifier is ready for operation. If the power
indicator did not light up, the amplifier is malfunction, please turn off the power and contact your local dealer
for service support.
3. The tubes regulated power supply might require around 30-60 seconds to ramp up the voltage gradually, it is
normal if you heard ting-ting noise from your headphone or speaker during this time.
4. The vacuum tube might require 10 minutes of warm up before they reach optimum performance.
5. Select your input source: XLR for balanced input, RCA for single-ended input.
6. If you are using single-ended headphone, insert the 6.35mm connector of your headphone into the
STANDARD headphone output on the front panel. Switch the headphone output selector (PHONES) to STA.
7. If you are using a 4.4mm balanced headphone, insert the 4.4 connector of your headphone into the 4.4
BALANCE headphone output on the front panel. Switch the headphone output selector (PHONES) to 4.4 BAL.
8. If you are using a 4pin XLR balanced headphone, insert the XLR4 connector of your headphone into the 4 PIN
BALANCE headphone output on the front panel. Switch the headphone output selector (PHONES) to 4 PIN BAL.
9. Select the appropriate output (L, M, or H) on the IMPEDANCE switch according to the specification of your
headphone for optimized performance.
10. Adjust Volume to appropriate level and enjoy your music.
Attention:
◆
might cause damage to the amplifier or associated equipment
◆You can swap headphones during playback, but to avoid damaging your sensitive headphone and
protect your hearing, please turn the volume down to 0 when you unplug or plug in another pair of
headphone.
◆If you have turn off the amplifier, please wait 2 minutes before you turn in on again, ot it might cause
damage to the vacuum tubes.
Please do not disconnect your interconnect when the amplifier is operating, this

15
Maintenance
Read the Manual: to operate the amplifier correctly, please read this user's manual carefully to understand
product features and safety precaution .
Keep the Manual: Please keep this manual properly for future reference.
Signage: Do not tear off or rub away the serial number.
Operation: Please follow the operations in this manual strictly.
Accessories: If you are going to use non-factory supplied accessories such as power cord or fuse, please
make sure they are fully compatible with the safety requirements otherwise might cause damage due to
improper usage.
Placement: The amplifier is heavy and the vacuum tubes are fragile, please place the amplifier on a stable, flat
surface, preferably a strong cabinet or rack. If the amplifier falls down because of insecure placement, the
amplifier will suffer damage and possibly causing serious household accident.
Power Supply: Please make sure your household AC power supply matches the power requirement of your
amplifier. If you are uncertain about the power supply situation, please contact your authorized dealer or local
power supply institutions.
Overloading: If you have to connect the amplifier to a power stripe or multi-socket, please make sure the
loading is within safety consideration. Overloaded power connection might lead to electric shock or fire
accident.
Warranty Service: Do not attempt to disassemble the machine or modify the component, this will void the
warranty service and might exposure yourself to electric shock.
Troubleshooting: If you encounter any abnormal behavior during setup or playback, please refer to the
advices in next pages of this manual to recover your amplifier back to normal operation. If you fail to rectify the
problems after that, please contact your authorized dealer for technical support.

16
Please follow the instruction in the manual in order to keep the amplifier under proper working condition. If the
amplifier is not functioning as intended, please check according to following tip to look for the possible reason.
Troubleshooting
Important Notice:
is registered trademark of Zhuhai Spark Electronic Equipment Co., Ltd. All right reserved
Problem
Cause
Solution
No Sound
after power
on
Power
Indicator is
OFF.
Power is not connected
Connect power cord securely
Check main power supply
Main fuse is out.
Replace fuse with same
specification
Power
Indicator is
ON.
NO input signal .
Check source equipment is working
Select input source correctly
Volume at minimum position
Turn up volume
Interconnect not properly connected
Connect all cables securely
Headphone cable not properly
connected
Connect headphone cable properly
Headphone output not specified
correctly
Select headphone output correctly
Selected the wrong output
Select headphone or speaker output
correctly
Umbilical Power cable not properly
connected
Reconnect the umbilical power
cable, position the alignment groove
correctly before tighten up the
screw-threaded connector
Excessive noise
Input source badly connected
Install interconnect properly
Interconnect grounding
disconnected
Replace interconnect
Equipment malfunction
Contact authorized dealer for
technical support
Soundstage and imaging
not focused
Left and right channel of source
equipment reversed
Reinstall related cabled correctly
Headphone cable polarity reversed
Speaker cable polarity reserved

How to Install Vacuum Tubes
Pin No. 9 Pin No.1
How to Install 9-Pin Vacuum Tubes
12 A U 7 (E C C 8 2 )、 12AX7(EC C 8 3 )
Applicable vacuum tube:
、5B K 7、12BH7、
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
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Address: 9 Lianfa Road, Liangang Industrial Park, Shuanglin Zone,Zhuhai, Guangdong, China
Post Code：519045
Zhuhai Spark Electronic Equipment Co., LTD
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