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A-300 2P MK
Vacuum Tube Integrated Amplifier
User's Manual
REV：1.1
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Thanks for choosing CAYIN A-300P MK2 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
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
…………………………………………………………………………………………………………1
Tube Replacement ………………………………………………………… ………… ………………………………11
Audio Connection………………………………………………………………………………………………………12
Speaker Connection……………………………………………………………………………………………………13
Turn on……………………………………………………………………………………………………………………14
Small Tips…………………………………………………………………………………………………………………14
Troubleshooting ………………………………………………………………………………………………………15
How to Install Vacuum Tubes…………………………………………………………………………………………16
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NOTE:
CAYIN A-300P MK2 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
Package Contents
Please carefully check the package first and then open it.
Package contents include:
1. CAYIN A-300P MK2 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
Recommendation:
Keep all packing materials for future use .
NOTE:
Pleas e mak e sure local voltag e level is matched wi th th e input level of the amplifi er, w hich indicates on t he rear
panel . Too lo w or too h igh vo ltage may cause p robl em. Pl ease cont act ou r company or our local agent if y ou'v e found
impro per volta ge.
All other parts except above are not included.
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Product Features
◆ 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.
◆ Japanese Audiograde Takman Carbon Film resistors have been used in key locations of the circuits
for better sound quality.
◆ Tube 6SN7 has been used in the preamplifier stage for voltage regulation.
◆ Two pieces of 12AX7 have been used for voltage amplification and four pieces of 12AU7 have
been used for driver stage.
◆ Four pieces of 300B power tubes have been used for Class A push-pull amplication.
◆ Switchable between different nagative feedbacks.0dB and -3dB can be chosen under diferent
hearing environment.
◆ 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.
◆ A-300P MK2 can memorize last operation of the unit once turned off.
◆ Soft start function (about 30 seconds).
◆ High-quality Japanese ALPS motor potentiometer.
◆ Thickly silver plated signal cable has been used.
◆ Equipped with easily-installed tube cover for protection.
Safety Precautions
1. Unplug the power cord if you are not goin g to use th e produ ct for an extended period of time.
2. The machine will become hot after working for a long time . Pl ease keep the uni t's ventilation open and
install the amplifier at a well-vent ilate d place t o avoid troubles and fire hazard.
3. Forbidden to operate when th e outpu t is open o r shorted.
4. Do not attempt to service this pro duct yourself. Opening the cover may expose you to dangerous
voltage or other hazards.
5. We are not respon sible for any problems caused by checking and opening wi thout permission of our
company. For service, Pleas e conta ct a qual ified service technician.
6. Do not place any objects fille d with li quids s uch as va ses or some others on the top or around.
7. Clean only with dry cloth.
8. Please move the amplifier ca reful ly not to d rop the unit or be subject to other strong shocks.
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Power Output
20W+20W
Frequency Response
7Hz~50kHz (-3dB)
THD
≤1%(1W/1kHz)
S/N Ratio
91dB
Input Sensitivity
300mV (Integrated)
1000mV (Pre-IN)
Input Impedance
100kΩ
Output Impedance
4Ω, 8Ω,16Ω
Input Terminals
LINE1,LINE2, LINE3,PRE-IN
Tube
300B×4、6SN7×1、12AU7×4、12AX7×2
WDH
420mm×389mm×200mm
Net Weight
27kg
Max Power Consumption
220W
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.
Specifications
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Maintenance
NOTE:
Use the soft dry cloth to clean up the chassis regularly.
◆
◆ Do not use any chemicals for cleaning.
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:
The information in this manual is subject to change without
further notice.
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Precautions
Connected to power socket
YALIDA
YN-401
Connected to AC INPUT
Connection of power cord:
Connect the speaker cables and signal cables first and then insert the power cord into the power socket.
NOTE:
◆ 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.
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Front Panel
2
Power Switch
1.
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.
2. Power indicator
Turn on the amplifier the power indicator will be
on.
Power Indicator/Mute Indicator
3.
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
4.
Used to control volume
IR Remote Sensor
5.
Used to receive the code of remote control.
NFB. Selector Button
6.
Used to choose NFB.0dB or NFB.-3dB
working state.
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3
4
Input Selector Button
7.
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.
Input Selector Indicator
8.
You can hear sound from LINE1 when LINE1
indicator is on.
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 A-300P MK2 can memorize last operation
of the unit once turned off.
9.
NFB.Indicator：
The NFB.-3dB indicator will be on when it is
-3dB；
The NFB.0dB indicator will be on when it is 0dB。
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Cayin A-300P MK2 can memorize last operation
of the unit once turned off.
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Rear Panel
1 2 3 4
Signal Input Terminal
1.
Used for audio source input.
Right Channel Output
2.
Used to connect with the right channel of speaker.
Left Channel Output
3.
Used to connect with the left channel of speaker.
Power Socket with Main Fuse
4.
Main fuse is located just below the power socket.
Replace the fuse with the same type and value.
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Top Panel
Diagram 4
Bias meter when not working
A
Diagram 5
Bias meter during working
Note : Whe n wor king normally,
the pointer should stay within
the A zone, still , it would move
for the voltage fluctuation.
1 2 3 1
1 Bias Selector Switch(A1、A2、A3、A4)
.
4 4765 5
Used to select corresponding tube for bias
adjustment.
Bias Adjustment Switch(A1、A2、A3、A4)
2.
Used to adjust bias of corresponding power
tube(A1、A2、A3、A4)
3. A1、A2、A3、A 4 :300 B Tube
4. V2、V3、V5、V 6 :12A U7 Tube
5. V1、V4: 1 2AX7 T ube
6. V7:6 S N7 Tub e
Bias Meter
7.
3
2
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 A3 A4 are the
same. After all have been djusted, do it one more
time to make sure all the bias levels of A1,A2, A3,
A4 are the same.
Sample of bias adjustment for power tube A1:
Used to monitor the working current of the
power tube.
1. Turn the Bias Selector Switch A1 to its opposite
8. HUM BA L ANCE
Adjustment Swith
How to adjust the 300B HUM:
Turn the volume knob to the minimum or mute
and adjust the HUM BALANCE with the flat
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, A3, A4 are the same.
screwdriver until you heard the smallest HUM.
Do the same for adjusting the other channel.
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NOTE:
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.
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Remote Control
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.
1. NFB.
Selector
2. Audio Source Input Selector
3. Mute Button
4. Volume Control Selector
Effe cti ve Di stanc e：abo ut 6m
NOTE:
◆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.
◆
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Tubes for the Machine
Tube Replacement
12AX7
12AX7EH、ECC83、E83CC、ECC803S
12AU7
12AU7EH、ECC82、E82CC、ECC802S
6SN7
6SN7GT、6H8C、ECC32、6N8P
300B
300B
Installation
Carefully read and follow the manual for installation:
◆
◆ 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
produce heat.
NOTE:
Tube Replacement
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.
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Audio Connection
Connection method of CAYIN A-300P MK2 with other audio equipments Take pictures below for your reference.
To au di o
outpu t te rm in al
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.
Wrong connection
Right connection
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Speaker Connection
SPEAKER（R）
RED
BL AC K
RED
BL AC K
SPEAKER（L）
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
Bana na pl ug
Norm al pl ug
NOTE:
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•
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.
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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 themusic
you prefer.
NOTE:
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.
Sm al l T i p s
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.
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Troubleshooting
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 comp onent s.
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 th e
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 signa l cable .
Replace the input signal
cable with a new one.
Components or circuits are in t roubl e.
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 res tore.
Low Battery.
Replace with new batteries.
Obstacles between the ampli fier an d
remote.
Remove the obstacles.
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.
NOTE: is the registered trademark of Zhuhai Spark Electronic Equipment Co., Ltd.
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How to Install Vacuum Tubes
How to In stall 9-P in Vacuum Tubes
Pin No. 9
Appl ica ble v acuum t ube :
12A U 7 ( E C C 8 2 )、 12A X 7 ( E C C 8 3 )
12AT7( ECC 81)、6922（ECC 88) , e tc. 9 -Pi n vacuu m tub es.
Inst ruc tio ns to C hange a nd In sta ll th e vacuum tub es:
To instal l a ni ne- pin vacu um tub e, ali gn the p ins of th e v acuum
tube w ith t he ho les o f the t ube s ocket and i nse rt th e tub e
vert ica lly u p and dow n (as s how n in the fi gur e abo ve).
Pin No.1
、 5B K 7 、 12BH 7、
Pleas e note that whe n instal lin g the nine-pin vacuum
tube, pay attention to the a lig nment of the vacuum tube
pins w ith the ho les of th e tu be socke t. O therwise wr ong
inser tio n wil l cause damage to t he va cuum tub e and
preve nt the amp lifier from worki ng proper ly, whi ch may
lead to f ail ure o f the ampli fie r.
How to In stall 8-P in Vacuum Tubes
Positioning Pi n
Appl ica ble v acuum t ube :
KT15 0、 KT170、 KT88、 65 50、 EL34、 6V6、 6SN 7、 6SL7、 5A R4,
etc. 8 -pi n vac uum tub es.
Inst ruc tio ns to C hange a nd In sta ll th e vacuum tub es:
To ins tal l an eight -pi n vac uum tube , a lign the p osi tio ning pin of
the tub e w ith the groove s i n t he pos iti oning holes of th e t ube
sock et, and i nst all the t ube by pu lli ng up a nd dow n vert ica lly
(as sh own i n the f igure a bov e).
Plea se no te that w hen instal lin g the eig ht- pin vac uum t ube,
pay atten tio n to th e ali gnmen t of th e vac uum t ube p osi tioni ng
pin wi th the posi tio nin g ho le of the tub e socke t. Othe rwi se
wron g inse rti on wil l caus e dama ge to the va cuu m tube an d
prev ent th e a mpl ifier from wor kin g p rop erly, whi ch may lead to
fail ure o f the a mplif ier.
How to In stall 4-P in Vacuum Tubes
Thi n Pin
Sma ll Hole
Appl ica ble v acuum t ube :
300B、2 A3 et c. 4- pin vac uum t ube s .
Inst ruc tio ns to Cha nge a nd In stall t he va cuu m tubes :
To instal l a fo ur-pin v acu um tub e, pleas e p ay att entio n t o t he
thic kne ss of diff ernet pi ns of the vacuu m t ube a nd th e size o f
the tube so cke t hol e. T hic k pin s hou ld be a ligned wit h the big
hole , and the thin pin sh oul d be ali gne d with the sm all hole.
Inst all t he t ube v erticall y up and do wn (as sh own in th e figure
abov e).
Plea se n ote that whe n inst all ing the four -pi n vacu um t ube,
pay attent ion to th e t hic kness of diffe rnet p ins of the v acuum
tube and the si ze o f th e tu be socket holes. Otherwi se w ron g
inse rti on w ill cause damag e to the va cuu m tube and preve nt
the amplifie r from w orkin g p roper ly, wh ich m ay le ad to fa ilure
of the a mpl ifi er.
Thi ck Pin
Big H ole
How to In stall Big 4 -Pin Vacuu m Tube s
Positioning Pi n
Positioning Pi n Sl ot
Appl ica ble v acuum t ube :
845、80 5、211 etc. 4 -pi n vac uum tub es.
Inst ruc tio ns to Cha nge a nd In stall t he va cuu m tubes :
To in stall the b ig f our-p in vacu um t ube , al ign the vac uum tub e
posi tio nin g pi n wi th p osi tioni ng pin slot of the tu be s ocket and
then ro tate 45° cl ockwi se to ti ght en. (As sho wn in th e p ictur e
abov e). To tak e o ut the b ig fou r-pin va cuu m t ube, tur n t he tube
45° co unt erc lockw ise a nd ta ke it out u pwa rd af ter loosen ing .
Plea se note that when ins tal ling the big four -pin vacu um
tube , pay atte nti on to the alignmen t of the v acuum tu be
posi tio nin g pi n wi th p osi tioni ng pin slot of the tu be s ocket and
then rotat e 45° c loc kwise to t ighte n. I t is st rictly fo rbi dden t o
inst all the v acu um tub e when the pos iti oni ng pin is off or
miss ing . O the rwi se wrong inser tio n w ill cause dama ge to t he
vacu um tu be a nd prevent t he a mpl ifi er f rom w orkin g pro perly,
whic h may l ead t o failu re of t he am plifi er.
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