Line Magnetic LM-501IA User manual

INTEGRATED VACUUM TUBE AMPLIFIER
LM-501IA

Thanks for choosing our Line Magnetic LM-501IA Integrated Amplifier as an important part of your
music system and please read the 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 please remove these foams to avoid any risks.
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Table of Contents
Table of Contents ------------------------------------------------------
Package Contents ------------------------------------------------------
Product Features -------------------------------------------------------
Specification ------------------------------------------------------------
Safety Precautions -----------------------------------------------------
Functions Description ------------------------------------------------
Connection --------------------------------------------------------------
Turning on --------------------------------------------------------------
Remote Control --------------------------------------------------------
Tube Replacement -----------------------------------------------------
Maintenance ------------------------------------------------------------
Warranty Statement ---------------------------------------------------
Troubleshooting -------------------------------------------------------
Suggestions:
LM-501IA Integrated 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.
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Please carefully check the package first and then open the package. Package contents include:
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Package Contents
1. Line Magnetic LM-501IA 1
2. Main Fuses 2
3. Power cord 1
4. Remote control 1
5. 1.5V Batteries(AAA) 2
6. User’s Manual 1
7. Warranty Card 1 Note:All other parts except above are not included.
Recommendation:
Keep all packing materials for future use and please fill in the warranty card for registration of warranty.
Note:
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 and in case you've found improper voltage please
contact our company or our local agent.
Product features
.One hundred watts per channel, Class AB Integrated Stereo Amplifier with KT120 output
power tubes, 12AX7, 12AU7 and 6SN7 input tubes.
．4 pairs of inputs and speaker terminals for 4, 8, 16 ohm speakers are located on the back panel.
．User bias control has been used for bias adjustment.
．Two separate meters for the Left and Right Channel have been built for monitoring.
．Specially designed EI transformers for power supply and two EI output transformers with
wide bandwidth are applied.
．Japanese ALPS volume potentiometer, Multicap coupling Capacitors etc Audio grade of
components have been applied.
．Standard with remote control.
．Hand made construction with the finest point-to-point wiring.
．SoftStart and time-delay circuit. (30 seconds).

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Power output：100W＋100W
Frequency response：10Hz～50kHz（-1.5dB）
THD：1%（1kHz）
S/N Ratio：87dB(A weighted)
Input Sensitivity：200mV（Integrated）1000mV(Pre-In) Input Impedance：100kΩ
Output Impedance：4Ω ，8Ω ，16Ω
Power Requirements： ～230V±5%（50Hz）
Dimension (WxDxH)：430mm x 355mm x 217mm
Tube Complement：12AX7 x2、12AU7 x1、KT120 x4、6SN7EH x2 Net Weight：32.5kg
Power Consumption：480W
Working Condition: Temperature: 0℃～40℃ Moisture: 20%～80%
Storage Condition: Temperature: -20℃～70℃ Moisture: 20%～90%
Note : Line Magnetic Audio reserves the right to change specifications at any time without
further notice in advance if products are upgraded. Specifications on the manual only show
the specifications of the amplifier you bought.
Specification
Safety precautions
1. Unplug the power cord if you are not going to use the product for an extended period of time.
2. Temperature will become higher after working in long period of time and 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 as unloaded.
4. Forbidden to operate when the output is open or shorted.
5. Do not attempt to service this product yourself. Opening the cover may expose you to dangerous voltage or other
hazards.
6. 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.
7. Do not place any objects filled with liquids such as vases or some others on the top or around.
8. Clean only with dry cloth.
9. Please move the amplifier carefully not to drop the unit or be subject to other strong shocks.
10. Unplug the power cord if you are not going to use the product during thunderstorm.
Carefully read and follow the Manual for installation:
1. Do not place the product near heat sources such as radiators, heat registers or other products that produce heat.
2. In order to avoid being overheated please keep the unit’s ventilation open.
3. Do not expose this appliance to rain or moisture.
4. Amplifier should install steadily and make sure all four feet are on the same level.
5. Keep the amplifier in a certain distance so that it can be easily connected.
6. Keep the amplifier in 15CM’s distance to the surrounding walls.

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Volume
Mute
REMOTE CONTROL UNIT
LM-02
Installation and replacement of the batteries:
Installation:
1.Unscrew the remote cover.
2.Insert two pieces of AAA batteries and please follow the guidance of positive and negative indication.
3.Reassemble the remote by screwing back the cover.
Remote Control
Description
VOLUME UP/VOLUME DOWN
MUTE
Replacement:
1.If the battery is low please replace them with new ones.
2.Two pieces of AAA batteries are used for the remote unit.
3.Do not misuse the new batteries together with the old ones.
4.Please use high quality batteries which can prevent leakage of electrolyte.

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Tube Replacement
Clean the amplifier with soft dry cloth and please do not use any chemicals for cleaning.
Maintenance
1. Limited Warranty: One-year limited warranty from the date of purchase except vacuum tubes which are warranted for six
months.
2. Limited to original purchaser. This warranty is for the sole benefit of the original purchaser of the covered product, and may
not be transferred to a subsequent owner.
3. Conditions & Limitations. This warranty is subject to conditions and limitations, as follows. This warranty is void and
inapplicable if the product has not been used or handled other than in accordance with the instructions in the owner’s manual,
or if it has been misused, abused, damaged by accident or neglect, or in transport once in possession of purchaser, or the defect
is due to the product being repaired or tampered with by anyone other than Zhuhai Line Magnetic Audio Co., LTD or an
authorized Line Magnetic Audio Representative.
4. Remedy: If the product contains material, or manufacturing defects, it must be packed in original packaging and returned to
Zhuhai Line Magnetic Audio Co., LTD or an authorized Line Magnetic Audio Representative at his or her sole expense.
A returned product must be accompanied by a written description of the defect and the warranty card with an authorized
dealer’s stamp on which indicates the model and series number, the date of purchase, the name and address of the purchaser.
Zhuhai Line Magnetic Audio Co., LTD reserves the right to modify the design of the product and change the specifications
without notice or obligation to any person.
5. Miscellaneous. Any implied warranties relating to the above product shall be limited to duration of this warranty. This warranty
does not extend to any incidental or consequential costs or damages to purchaser. Our liability will be no more than the amount
you paid for the product that is the subject of a claim. This is the maximum amount for which we are responsible. This warranty
gives you specific legal rights. You may also have other rights which vary from country to country, state to state
Warranty Statement
Terms & Conditions:
12AX7 12AX7EH、ECC83、E83CC、CV4004、ECC803、5751
Common Replacements
Tube Basics
12AU7
6SN7EH
ECC82、12AU7EH、5814、6189、CV4003
6N8P、*6H8C、*6H8M、6F8G、CV181、QB65、ECC32
KT120

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Troubleshooting
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 reason.
Sometimes problems would be caused by the other related products and please have a check too on those connections.
Even doing so, if the problem still exists please contact with your local agent or our company.
Problem Cause Remedy
NO OUTPUT
Power LED is ON.
Power LED is OFF.
Power cord is not well-connected
Main fuse is out.
Troubles of inner parts
or components
Please check the power cable connection or
power outlet connection
Replace with the same type and value fuse
Please contact with local agents or our
company.
NO signal input
Volume is at ZERO Turn up the Volume
Check the function of the sound source
Check the input selection and switch to the
proper input.
NO reaction to the remote
Sound field Positioning is
not so good.
Noise output
Sound Distortion 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
Disturbed by external instruments
Battery is out of electricity
Obstacle is located between the
remote and the amplifier
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
Keep away from the disturbance and
restart the amplifier.
Replace the battery with new ones
Remove the obstacle
Line Magnetic logo is registered trademark of Zhuhai Line Magnetic Audio Co., LTD.
Copyright of Zhuhai Line Magnetic Audio Co., LTD. All Rights Reserved.

The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to alert users
to the presence of uninsulated “dangerous voltage” within the product’s enclosure that may be of
sufficient magnitude a risk shock to persons.
The exclamation point within an equilateral triangle is intended to alert the user to the presence of
important operating and maintenance (servicing) instructions in the literature accompanying the
appliance.
RISK OF ELECTRONIC SHOCK
DO NOT OPEN
CAUTION
.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.
Note: Input voltage level of the amplifier is 230VAC～5% and please make sure that the supply
voltage is proper. Too low or too high voltage may cause problem or reduce its life.
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Safety precautions
Functions Description
Front Panel:
1.IR Remote Sensor: React according to
the orders of the remote.
3.Input Selector: Source selection among
LINE1, LINE2, and LINE3 Inputs.
7.Indicator for Operation/Mute: Indicate the state of the amplifier. Orange means
operation and if turning on it will twinkle for 30 seconds during the time delay.
If it is muted the indicator will twinkle too.
2.Volume Knob: Volume up to the right
while volume down to the left.
6.Ampere Meter: Monitor the currency of
the power tubes or power output.
8.ON/OFF: Turn on or turn off the amplifier.
4.Integrated or power amplifier selector
5.Power output monitoring or bias monitoring

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Functions Description
Rear Panel:
2.Right Channel output: used to connect with the right
channel of the speakers.
1.Signal Inputs: used for source input.
4.Power Socket with main fuse: Main fuse is located on the rear of the amplifier just
below the power cord socket. Replace with the same type and value fuse.
3.Left Channel output: used to connect with the left channel of the
speakers.

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Overview from the top
Note: 1. Be careful of the high temperature of the tubes during
operation.
2. Driver tubes and Power tubes must be matched for
better results.
Functions Description
Bias Adjustment for V1, V2, V3, V4:
V1, V2,V3, V4:KT120 Power Tube
Turn on the amplifier and wait for around ten minutes. Choose and turn the Bias Current selector from its “OFF”
position to V1. Turn down V1 BIAS ADJ. to its MIN. position first and then adjust the bias current. Inspect the
ampere meter on the front panel and make sure the pointer is at the position showed as in the pictures below.
(Suggest Bias Value:40mA)
If you have any questions please contact with our company or local service agent.
Bias current adjustment for V2, V3, and V4 are the same as for V1. Please adjust the corresponding BIAS ADJ. and
make sure all the bias level of V1, V2, V3 and V4 are the same. In order to make sure the amplifier works in its best
condition please retest each tube’s operation state after used for 150 hours.
V5, V6: 6SN7EH V7: 12AU7 V8、V9：12AX7

Check the impedance of your speakers. Attach the positive from your speaker to the 4, 8 or 16 ohm terminals and the
negative to the 0 ohm terminals separately. 4 ohm, 8 ohm or 16 ohm impedance speakers are preferential and if your
speakers are 6 ohm it would not cause damage to the amplifier and experience using 4, 8, or 16 ohm positive terminal
to find what the best is for your speakers. Please take the right guidance for connection and do not mix as wrong
connection may cause noise or low grade function.
How to connect the speaker cables:
1.Unscrew the terminal knobs,
2.Insert the speaker cables,
3.Screw the terminal knobs.
speaker terminal
U type terminal
Note: Connect the speaker cables with the amplifier after it is well connected with the speakers.
Please notice the right direction indication of the cable and do not mix up the positive and the negative
end.
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Speaker Connection
speaker(L) speaker(R)
Connection

Suggestions:
Here is the standard way of connection for LM-501IA with other audio equipments.
Please take pictures below for your reference:
Audio Connection
1.During installation please always refer to other products’ operation manuals.
2.Please do not insert the power cord into the main socket only if all other instruments are well connected.
3.R refers to right channel while L represents left channel.
4.Please take the right guidance for connection as wrong connection may cause noise or low grade function.
5.Do not fasten signal cables together with other cables just like the power cables to avoid disturbance.
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Connection
Turning ON
Before turning on the amplifier please make sure all connections are right and power supply is stable.
1.Turn on the amplifier and the power LED will be on. It shines indicating that the amplifier is working.
2.In 30 seconds the power LED will keep lighting up. It means the amplifier functions very well. Or if the LED is not
on please contact with our local agent or our company.
3.Select the right sound source, adjust the volume to a certain position and then you can enjoy the music you prefer.

Connect to AC 230V ~50HZ
Note: 1.It is normal that power transformer becomes hot for extended period
of operation.
2.Please unplug the power cord if you’re not going to use the product for
an extended period of time.
3.Please do not insert the power cord into the mains socket only if all
other instruments are well connected
4.To prevent damage to the amplifier never cut off the speaker cables
while the unit is ON.
5.In order to protect the tubes please re-switch on the amplifier after
turned off in two minutes.
Warning: Please make sure corresponding voltage is the same as required.
We are not responsible for damage caused by misuse of unsuitable
voltage.
Precautions:
Connection of the power cord:
Connect the speaker cables and signal cables first and then plug the power cord into the power socket.
Before turning on the amplifier please make sure all connections are right and power supply is stable.
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Turning ON