Shuguang S300MK User Manual

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Thank you very much for choosing Shuguang Audio Classic Series vacuum tube amplifier

(KT88 version).

When opening the package, please carefully remove the tube cage (vacuum tubes are

packed inside the cage) and install each tube to its marked location on the amplifier. Please

double check to ensure a safe and secure connection for each tube in its socket.

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

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or off for safety precautions.

 Each channel has two output terminals – 4 ohm and 8 ohm. Under no

circumstance should the product be connected with speakers at both 4 ohm and

8 ohm terminals at the same time. This will overload your amp and cause serious

damages.

 Before turning on the product, please check if your speakers are connected to the

amplifier properly. Turning on a tube amplifier without speaker load could cause

serious damage to your amplifier and it is not covered by manufacturer’s

warranty.

 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.

 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.