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Precautions
Installation place
Install this unit in a location where good ventilation and heat
radiation is assured.
Do not install it where the temperature is high such as in
direct sunlight, or where it is dusty or humid, as this could
result in damage to this unit despite proper heat radiation.
Ventilation holes
The ventilation holes on the top and bottom boards of this
product must not be blocked because this unit is a vacuum
tube amplifier and generates considerable heat. If the am-
plifier is installed on a rack or the like, secure ample space
for cooling and leave the door open. Do not pile up other
things on the amplifier and never put articles on it. Failure to
observe this may cause a malfunction.
Note:
For heat dispersal, do not install this equipment in a con-
fined space such as a book case or similar unit.
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Precautions in connecting with other
components
When connecting this product to input devices such as a
control amplifier, be sure to turn off the power of this prod-
uct and all other connected devices. Otherwise, a very
strong noise may be generated and destroy the speakers.
In the worst case, this can cause equipment malfunction.
The pin-plug to be inserted in each input terminal of this
unit shall be pushed in firmly. If the grounding terminal is
inadequately connected, noises including hum may be gen-
erated, resulting in an adverse S/N ratio.
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Note
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Wall
VACUUM TUBE STEREO POWER AMPLIFIER MQ-300
Cautions in connecting speakers
When making speaker system connections, be sure not to
cause short-circuiting between ! and @ of the speaker ter-
minals and speaker input terminals of this unit. If signals are
applied to the amplifier with its circuit left short-circuited, a
large current may be carried in the output circuit and cause
malfunctioning.
The sound is not generated shortly after
the power supply is turned on.
This product is a vacuum tube amplifier, and therefore, it
cannot deliver a sound until the vacuum tube heaters warm
up.
You can enjoy music 1 minute or more after turning on the
power. We therefore advise initially setting the volume con-
trol at a low level. After that, you may move the volume con-
trol to your favorite sound level after the initial sound comes
out of the speakers.
Repair and adjustment
When repairs and adjustments are needed, please consult
with the dealer where you bought the unit.
Cleaning
For cleaning, use a piece of soft cloth to wipe the unit such
as cleaning cloth. When the dirt is hard to remove, use a
small amount of neutral detergent to wipe, and then wipe
the unit with dry cloth. Do not use a solvent like benzine
or thinner because such substances can often damage the
exterior.
Safety caution
Caution
This unit is a vacuum tube power amplifier. Be careful not to
touch this product with your bare hand because this product
becomes hot in the power-on state. For safety, do not use this
product in a place where children or unchained animals are
present.
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