Shuguang Audio Classic Series User manual

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Thank you very much for choosing Shuguang Audio Classic Series vacuum tube
pre-amplifier.
Please read this manual in its entirety before you turn on the amplifier for the first time.
About Shuguang Audio
Shuguang Electron Group (aka Shuguang Electron) currently is the world’s largest vacuum
tube producer. The group was formed in 1958 and over the past decades, Shuguang has
designed and manufactured many high quality audio vacuum tubes and they are used on
tube audio products under many brands.
Shuguang Dongsheng Electronics Co. Ltd (aka Shuguang Audio) is a subsidiary of
Shuguang Electron Group, specialized in high end vacuum tubes and tube audio design,
manufacture and distribution.
This Shuguang Classic series vacuum tube amp is one of Shuguang Audio’s many
products.
Caution!
This product should only be used with its specified power supply voltage /
frequency to ensure safety and longevity.
If the product is not in use for extended period of time, please unplug the unit
from your power supply.
When the product is powered on, do not touch the vacuum tubes with bare
hands or any materials that could melt at high temperature. Tubes operate at
extremely high temperature and could cause serious burn to exposed skin.
Children should be kept away from a tube amplifier, no matter if it is powered on
or off for safety precautions.
The product should be kept in a dry area, without excessive moisture and has
absolutely no contact with liquid.
Tube amplifier produces heat during operation –it should always be kept well
ventilated. Do not install them inside an enclosed cabinet.

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Any repairs should be carried out by certified personnel only.
When moving a tube amplifier, please be gentle in case the vacuum tubes are
damaged during handling.
Under no circumstance should a vacuum tube be removed from a tube amplifier
or speakers are disconnected while the amplifier is still powered on.
Functions:
Front Panel:
1. power on/off 2. Volume 3. Inputs 4.Remote infrared
Top View:
1.EL84 2. 6Z4 3. 12AX7 4.12AX7 5.12AU7
Rear View:

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1.Inputs 2.Outputs (L & R channel) 3. Power socket 4. Fuse
Remote Control：
1.Inputs
2.Infrared transmitter
3.Power on/off
4.Volume
Specifications:
This preamplifier is designed to match the Shuguang Classic S845MK power amplifiers.
It may not match other power amplifiers –please read the specifications and consult
your power amplifier manufacturer for matching issues directly. We are not responsible
for any damages caused by preamp and power amp mismatching.
Input impedance: 100kohm
Input Power Voltage: ≤150mV
Output Voltage: more than 3V, maximum 10V
Output impedance: less than 10k ohm
Frequency Response: 10Hz-90KHz
THD: <0.2%
S/N Ratio：90dB
Power supply：AC 115V 60Hz
Net weight：8.5 Kg / 19 lbs
Size：240mm （W）×425mm（D）×160mm（H）

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Operations Instruction:
1. Connect the provided power cord to the power socket at the rear panel. Use a proper
size 3-prone power cord only if you plan to upgrade the stock power cord.
2. Connect matching S845MK power amps to the S200MK preamp, and connect speakers
to each power amplifier. (Please read the manual for S845MK and follow all
instructions carefully.)
3. Turn the volume knob on S200MK to minimum, press down“Power” button. The
Power LED light will come on.
4. Wait for 30 seconds, adjust the S200MK volume to proper level then you can start to
listen to the music.
5. In 5-10 minutes after power on, the amplifier and the tubes will be preheated and the
sound will be warmer and fuller than just powered on.
Cautions regarding vacuum tubes:
1、Each tube has a guide pin and the tube should only be installed with the guide pin fits
into the socket appropriate position.
2、Do not pull a tube by holding the glass part only. Only pull a tube by its base. Do not
shake, tap or snap a vacuum tube. A tube is a very fragile and delicate device –any
external force could cause fatal damage to it and such damage is not covered by
manufacturer’s warranty.
3、When a tube’s internal silver coating becomes grey or white, the tube’s vacuum seal
has broken and it must be replaced.
4、When a tube’s plate becomes abnormally red hot (it can only be identified in a dark
room), it indicates that the tube is running at over its heat dissipation limit. You should
turn off the amp immediately and find out what caused the overheating, which could
be a result of voltage variation, bias setting too high or a failing component in the
circuit. It’s highly recommended to have a technician to check out the amp
thoroughly before resuming normal use.

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Warranty:
Please consult your local distributor for warranty policy.
Manufacturer: Shuguang Dongsheng Electronics Co., Ltd. Phone: [phone] Fax：[phone]