Line Magnetic LM-212PA User manual

OWNER’S MANUAL
LM-212PA
212

Table of contents
Table of contents 2
Package contents 3
Product features 3
Specifications 4
Safety instructions 4
Recommendations 5
Recycling product 5
Glossary 5
Location and precautions 6
Power sources 6
Warranty 6
Functions descriptions (front view) 7
Functions descriptions (rear view) 8
Bias adjustment (top view) 9
Speaker connection 10
Audio connection 11
Turning on 12
General observations 12
Tube replacement 13
Maintenance 13
Troubleshooting 14
Thank you for choosing a Line Magnetic product. Its implementation has been our know-how, both in terms of design to
the manufacturing. Electronic components and mechanical parts correspond to the selection criteria of very high quality.
Operation and finish of each product have been checked before delivery. To obtain best results, please read the advice
contained in this document.
Please read this manual carefully before installation and operation.
In order to prevent damage during transportation, the amplifier and its tubes are packed with protective foam, please
remove these foam pieces before operating your amplifier to avoid any risks!
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1x LM-212PA
2x Fuses
1x Detachable power cord
1x This user manual
WARNING
Product features
Package content
Make sure that the device is not plugged into the mains before making any connections. It is also recommended to turn
off or disconnect all other devices associated while making connections to the product.
Keep all packing materials for future use and please fill in the warranty card for registration of warranty.
Please make sure that your local voltage is the same as indicated on the rearpanel. A too low or too high voltage can
cause serious damage to your amplifier. In case you find an improper voltage, please contact our company or your local
dealer.
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Input stage: 1x 310
Driver: 1x 300B
Rectifier: 1x 274B
Power stage: 1x 212 single-ended and pure Class A
Analog inputs: 2x RCA and 1x XLR
Load impedance: 4/8/16Ω
SoftStart and time-delay circuit. (30 seconds)
Handmade construction with the finest point-to-point wiring.
Specially designed and made with top grade materials, EI-typedriver and output transformers.
Ingenious lifting function of the 212 power tubes and protective measures with programmed control.
External bias test meter for Power tube.
Auto bias for 300B to make sure the tubes are working at their best state.
Toroid power transformers with high power output are used for optimal power control.
Top grade of well-chosen components: Top grade of American RTX Multicap capacitors, Danish Jensen capacitors,
German Mundorf MCap capacitors, NCC capacitors, Nichicon capacitors and Kiwame capacitors, Motorola high
current rectifier bridge, Topgrade Panasonic relay etc.
Metal and removable tube guard cage.
Note: A complete system is a combination with two LM-212PA power amplifiers, one Preamplifier like LM-512CA and the
Source.
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Safety instructions
We invite you to read the instructions on the proper use of your product carefully. They will ensure the proper functioning
of the latter and it safely.
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Do not use this device in a wet area, near water, do not expose to rain or moisture.
Do not place any objects filled with liquids such as vases or some others on the top or around.
Do not move the product if it has just been used or if it is still hot.
Do not install near heat sources.To avoid being overheated please keep the unit’s ventilation open.
Never cover the ventilation of the unit.
Amplifier should install steadily and make sure all four feet are on the same level.
Keep the amplifier in 15 cm’s distance to the surrounding walls.
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.
Clean only with a dry cloth. As a precaution, it is best to unplug the unit before handling and ensure the heat generated
by the product has been properly dissipated.
Please move the amplifier carefully not to drop the unit or be subject to other strong shocks.
Unplug the power cord if you are not going to use the product for an extended period of time or during lightning storms.
Take great care of electrical connections (power cord and plugs). In particular, do not walk on, or press the power cord,
specifically at plugs, power plant and the output of the power supply.
Be sure to use an appropriate power supply to the power jack on the unit outlet. Especially if the device is equipped
with a ground plug, it is necessary to use it.
Forbidden to operate when the output is open or shorted.
Do not attempt to service this product yourself. Opening the cover may expose you to dangerous voltage or other
hazards.
Use only spare parts and accessories recommended by Line Magnetic.
We are not responsible for any problems caused by checking and opening without permission of our company. For
service, please contact a local dealer or qualified service technician.
Power output: 32W RMS Working conditions:
Temperature: 0°C to 40°C
Moisture: 20% to 80%
RFrequency response (±1,5dB): 15Hz-35KHz Storage conditions:
Temperature: -20°C to 70°C
Moisture: 20% to 90%
Input sensitivity: 1000mV THD: 1%
S/N ratio: 87dB
Dimensions (W x H x D): 300 x 600 x 575 mm Input impedance: 100kΩ (RCA), 600Ω (Balance)
Output impedance: 4Ω, 8Ω, 16Ω
Tubes: 1x 274B, 1x 310, 1x 300B, 1x 212 Net weight: 60kg
Power requirements: 230V ±5% (60Hz) Power consumption: 330W
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Glossary
This symbol alerts the user to the presence of unprotected dangerous voltages which may pose a risk of
electric shock to the user.
This symbol alerts the user that the documentation that comes with the device contains important instructions
for maintenance and proper use of the product.
The CE mark indicates that this product complies with European directives Low voltage (2006/95/EC),
Electromagnetic Compatibility (2004/108/EC) and apply eco-design requirements for energy products
(2009/125/EC) when the appliance is installed and used in accordance with the user manual.
For continued compliance only Line Magnetic accessories must be used with this product and servicing must
be performed by specialized and qualified staff.
The WEEE symbol is that of the European Union regarding the recycling of electrical and electronic
equipment. It indicates that this product contains electrical and electronic components that can be reused,
recycled or recovered. Therefore this product should not be disposed of in your regular trash. Thank you to
return the unit or contact your authorized dealer for more information.
Input voltage level of the amplifier is 240VAC ±5% and please make sure that your local voltage is the same as indicated
on the rear panel. A too low or too high voltage can cause serious damage to your amplifier. In case you find an improper
voltage, please contact our company or your local dealer.
With headphones, do not use it to excessive noise. Otherwise, prolonged listening at high volume levels may cause
permanent damage to your hearing.
When disposing of used batteries, please comply with governmental regulations or rules defined by the public
statements relating to the environment applicable in your country.
Never expose the batteries (battery pack or batteries installed) to excessive heat such as sunshine, fire, etc ...
At the end of its useful life, this product should not be disposed of with regular garbage, but returned to a collection point
for the recycling of electrical and electronic components. This point is emphasized by the symbol on the product, the
instruction manual and on the packaging.
The materials can be reused in accordance with their markings. Through reuse and recycling of raw materials or any
other form of recycling, you make an important contribution to environmental protection. Your municipality can tell you
where is the point of the nearest collection site.
Recommendations
Recycling product
5

Location and precautions
Power sources
Warranty
Avoid placing it in direct sunlight or near a heat source. No source of heat shall be placed on the apparatus. Also avoid
all sources that could cause vibration, dust, cold or moisture. The recommended ambient temperature range is 5-35 °C.
The device must be installed on a stable, level surface. Do not place the unit on an unstable surface or shelf. The unit
may fall, causing serious injury to a child or adult as well as serious damage to the product. Do not place other equipment
on top of the unit.
Due to stray magnetic fields, turntables or CRT TVs should not be located near the unit to avoid possible interference.
The unit should be operated only from the type of power source indicated on the label. If you are unsure of the type of
power available to you, thank you to contact your dealer or the company responsible for the power supply in your area.
Turn off device if you do not intend to use this unit for a long time.
In case of prolonged absence from home, it is recommended to unplug from the electrical outlet.
Make sure each cable is correctly inserted. To prevent hum or background noise, do not mix antenna or other cables
with the power cord or speaker wires.
Keep all packing materials for future use and please fill in the warranty card for registration of warranty.
Your Line Magnetic product is covered by the legal warranty in force in your country. You may also have other rights
which vary from country to country, state to state.
The guarantee of the product is linked to the exclusive use of tubes supplied by the official distributor and in accordance
with the assembly technical specifications.
In addition, you benefit from a commercial guarantee offered by Line Magnetic Australia on the products.
For details on this warranty, please refer to the information available on www.line-magnetic.com.au
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1
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BIAS ADJ.: Switch to test plate current for 212 tube.
Switch N.F.B. (Negative Feedback) between large loop is HIGH NFB (B) and small loop for LOW NFB (A).
In low NFB position, the sound is more soft while as for the high NFB position, the sound space is larger.
Power switch (On/Off) and Power indicator.
Button to raise the 212 tube. IMPORTANT: Check page 12 for more information.
Button to lower the 212 tube. IMPORTANT: Check page 12 for more information.
Front panel
Functions descriptions
Input voltage level of the amplifier is 240VAC ±5% and please, make sure that your local voltage is the same as indicated
on the rear panel. A too low or too high voltage can cause serious damage to your amplifier. In case you find an improper
voltage, please contact our company responsible for the power supply or your local dealer.
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212
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Rear panel
LM-212PA
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RCA Input selection
RCA 1 input
RCA 2 input
XLR input
Switch between RCA and XLR Input
Speakers terminals
Power phase selection
Power socket
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212
Top view
Fine adjustement of plate current of tube 212.
Ampere meter of tube 212.
Bias current adjustment tube 212.
Hum adjustment (noise). 4
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Bias adjustment for 212 tube
Notes: You do not need to perform the bias adjustment when using the amplifier for the first time.
Turn on the amplifier and wait for about ten minutes.
WARNING : When making adjustments, be careful not to burn yourself with tubes that are very hot.
V1: Power stage
212 tube
V2: Driver
300B tube
310 tube
274B tube
V2 tube is auto-biased and you do not need to adjust the bias. Input, Driver and Power tubes (212, 300B, 310 tubes)
must be matched for the best results. If two vacuum tubes bias are not at the same level it means there are some working
current deviations of the power tubes.
Switch the BIAS ADJ to V1, switch is located on the front panel, to test plate current for 212 tube. Inspect the ampere
meter on the front panel and make sure the needle is in the area ia=70mA shown on this diagram (below). If it is not,
adjust the bias via the top screw to get close to this value, then use the fine adjustment for final setting.
To optimize listening to the amplifier, it is recommended to use about
150 hours, according to the above method to test the working state of
power tube.
Noise adjustment method: When the machine appear hum noise,
adjust the V1 HUM BALANCER potentiometer noise, and listen to the
corresponding channel speaker to minimize noise.
If you have any questions, please contact a local maintenance
service or your local dealer.
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Speaker connection
WARNING: Make sure that the device is not
plugged into the mains before making any
connections. It is also recommended to turn
off or disconnect all other devices
associated while making connections to the
product.
Never operate the amplifier without having first
connect the loudspeakers. The operation of a
tube amplifier is different from transistor
amplifier; without speakers connected, energy
is dissipated through the transformers of the
amplifier which will damage the product and
reduce it’s useful life.
Check the impedance of your speakers. When
using a pair of speakers, you can use speakers
with an impedance of between 4, 8 and 16
ohms. BE SURE TO USE THE MATCHING
TERMINALS.
1- Unscrew the terminal by hand.
2- Insert the loudspeaker cable (refer to the diagram below).
3- Screw the terminal.
4- Repeat the same operation for the other 3 terminals.
Please notice the polarity of the cable and do not mix up the positive and the negative ends.
Connect the speaker cables with the amplifier after they have been connected to with the speakers.
Make sure that no wires can short the speaker outputs. Make sure that the speaker terminals are tight enough to
ensure a good electrical connection. If the terminal screws are not tight enough, the sound quality may be affected.
Use only dedicated wire to connect the speakers. A section of 1.5 mm² or more is recommended if the cable length is
greater than 3m.
Speaker terminal
Speaker cable or
U-type terminal
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l
LM-212PA
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Use RCA or XLR cables to connect the preamplifier and two LM-212PA amplifiers.
Audio connection
1- During installation please always refer to other product’s operation manuals.
2- Please do not insert the power cord into the main socket until all sources are connected.
3- Rrefers to the Right channel while Lrepresents the Left channel.
Do not also fasten signal cables together with other cables such as power cables to avoid disturbance.
Connection of the power cord
AC 240V / 50HZ
#2 HOT
#3 HOT
~220V 50Hz 45W
LM-500PA LM-500PA
LM-212PA
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Turning on
IMPORTANT - BEFORE TURNING ON THE AMPLIFIER
Please make sure corresponding voltage is the same as required. We are not responsible for damage caused by misuse
of unsuitable voltage.
Make sure all connections (first, connect the speaker cables, then the cables from your sources, and plug the power
cable into the AC outlet) are valid, and the stability of your power supply AC 240V - 50Hz.
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PRECAUTIONS
It is necessary to know about the use of ON & DOWN buttons due to the lifting function of the 212 tube.
Startup procedure
1- Set the VOLUME of the preamplifier to zero (potentiometer totally on the left).
2- Make sure the LM-212 has been connected to speakers and to the preamplifier.
3- Turn source on, then turn preamplifier on.
4- Press POWER SWITCH to ON and wait the 212 tube to move up and the tube’s filaments are lighten.
5- Adjust the VOLUME knob as you like to enjoy your music.
WARNING : Please make sure corresponding voltage is the same as required. We are not responsible for damage
caused by misuse of unsuitable voltage.
General observations
It is normal that power transformer becomes hot for extended period of operation.
Unplug the product during lightning storms or when not in use for a long time.
To prevent damage to the amplifier never disconnect the speaker cables while the unit is ON.
In order to protect the tubes please re-switch on the amplifier after turned off in two minutes.
This product is designed and manufactured with our original parts for reaching the best results. We are not responsible
for problems and damages caused to the amplifier by non-original replacement parts.
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’ve bought.
ON: Connect power supply and press “POWER SWITCH” button, then after warm-up, check V2, V3 and V4 tube if they
are in proper working condition.
Press “UP” button, which lights the large meter and lifts the 212 tube upwards.
Within about one minute, the 212 tube filaments will light.
Thirty seconds later, the amplifier begins to work with high voltage passing through.
DOWN: Press the “DOWN” button, the down indicator lights, and turns off the 212 tube.
The 212 tube begin to move downward a little in the first two seconds, then stop for rejection of heat, two minutes later
it will move down to the original position.
Within one minute, the down indicator and meter shut off, but V2, V3 and V4 tubes are still working.
Press “Power Switch” button, to cut off the power supply.
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Tube replacement
Maintenance
WARNING
Cleaning
1. Use soft dry cloth to clean the amplifier.
2. Refer to the safety precautions if you are going to use chemically treated cloth for cleaning.
3. Use a soft cloth with neutral detergent first and then wipe with a dry cloth.
As a precaution, it is best to unplug the unit before handling and ensure the heat generated by the product has
been properly dissipated.
Basics tubes Common replacements
274B 5R4GY, 5X4G
310 Soviet Union/om12C, WE310A
300B 300B, 300A, 4300B
212 ML-212E
212
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Problem Cause Solution
Power LED is OFF. Power cord is not well-connected. Please check the 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 your local dealer.
Power LED is ON. Volume is at zero. Turn up the Volume.
No signal input. Check the function of the sound source.
Check the input connectors and/or switch to the
proper input
Sound distortion. High input signal level. Turn down the volume to suitable position.
Replace the signal input cable.Damaged signal cable.
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 your local dealer.
Stereo image is not so
good.
Signal input cables or speaker cables
are wrongly connected.
Reconnect it as suggested in the manual.
No reaction to the remote
control.
Disturbed by external devices. Keep away from the disturbance (ie: microwave
oven) and restart the amplifier.
Batteries of the remote control are
low.
Please replace the batteries.
Obstacle is located between the
remote control and the amplifier.
Move the object that blocks the IR rays between
the remote control and the IR sensor located on the
front of the amplifier.
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Please follow the instructions in this manual to keep the amplifier working in a reliable and safe manner.
Sometimes problems could be caused by other related equipment, please check the connections.
If you experience a problem with this unit, please check the following items before requesting service. If it still does not
operate correctly, contact the retailer where you purchased the unit.
For repair, during or after the warranty, please contact your local dealer.
Troubleshooting
The LM-212PA is designed and manufactured with our original parts to achieve the best results. Line Magnetic is not
responsible for problems or damage caused by non-original parts being used in the unit.
Line Magnetic is not responsible for any problems caused by checking or opening the unit without the permission of the
company or dealer. For service, please contact your local Line Magnetic dealer or Line Magnetic Australia.
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Line Magnetic Australia Pty Ltd
Email: [email protected]
www.line-magnetic.com.au