VACUUM TUBE INTEGRATED AMPLIFIER
SQ-38u
Owner`s Manual
Contents
Precautions ············································································································· 1
Names and Functions ······························································································ 2
Connections and Connection Diagram ···································································· 6
Operations ··············································································································· 8
How to Use Remote Control ···················································································· 9
SQ-38u Block Diagram ·························································································· 10
Specifications ········································································································ 11
Before Asking for Repair Services ·········································································· 12
* Note
* *
Wall
*
Precautions
Installation place
This product shall be installed in a well-ventilated and effec-
tively heat-released place.
Especially, installation of this product where direct sunlight is
present, where the temperature rises excessively high such
as close to a heater, or where it is humid or dusty may cause
a malfunction even if heat is efficiently released. Therefore, do
not install this unit in such places.
Ventilation holes
Do not block the top and bottom faces because this product
is a heat-generating amplifier that contains vacuum tubes. If
the amplifier 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. Fail-
ure to observe this may cause a malfunction.
Note:
For heat dispersal, do not install this equipment in a confined
space such as a book case or similar unit.
Cautions in connecting speakers
When making speaker system connections, exercise extra
care not to short-circuit between ! and @ of the speaker ter-
minals and speaker input terminals of this product. If a signal
is applied to the amplifier with its circuit left short-circuited, a
large current may be passed through the output circuit and
cause a malfunction.
The sound is not generated immediately
after the power supply is turned on.
This amplifier is equipped with a time muting circuit in order to
separate the output circuit. Therefore, no sound is generated
immediately after the power supply is turned on.
If the volume control of the amplifier is moved to a high sound
level before the time muting circuit is canceled, a large sound
is suddenly generated. Please be advised that the volume
control shall be set to a low level at first and adjusted after
sound comes out of the speakers.
Batteries
Caution:
Batteries used for remote controller shall not be exposed to
excessive heat such as sunshine, fire or the like.
Precautions in connecting with other
components
When connecting this product to input devices such as a CD/
DVD player and a tuner, be sure to turn off the power of this
product and all other connected devices. Failure to observe
this may generate a strong noise resulting in speaker damage
or cause a malfunction.
The pin-plug to be inserted in each input terminal of this prod-
uct shall be pushed in firmly. If the grounding terminal is inad-
equately connected, noises including hum may be generated,
resulting in an adverse S/N ratio.
Repair and adjustment
When repairs or adjustments are needed, please ask the
dealer where you bought the unit.
Cleaning
For cleaning, use a piece of soft cloth to wipe the unit such as
cleaning cloth available on the market. If the unit has become
remarkably dirty, remove the dirt with soft cloth absorbing
a small amount of neutral detergent, and then wipe the unit
with dry cloth. Do not use a solvent like benzine or thinner
because such a substance can damage the exterior.
1
Names and Functions
1 3 6 7 8 9 1110
121314151617
542
1. Operation switch (OPERATION)
Toggles the power on and off. When connection of the in-
put/output terminals is performed, be sure to turn off this
switch. When the power is turned off and on again, put 1
minute or more between off and on.
3. Separate switch (separate)
2. Speaker selector (speakers)
Selects either of 2 speaker systems, A or B, located at the
rear panel.
off : No sound is generated from any speakers.
The headphone output cannot be disabled.
A : Selects the A system speaker terminal.
B : Selects the B system speaker terminal.
A+B : Simultaneously activates both A and B system
speakers.
When both speaker terminals are simultaneously
used, select speakers with impedance of 8 ohms
or more because both output terminals are con-
nected in parallel.
4. Low cut switch (low cut)
Separates the pre-amplifier and main-amplifier each other.
off : Uses this unit as a normal pre-main amplifier.
on : Feeds external signals from the MAIN IN terminal on
the rear panel to the main-amplifier section.
When the separate switch is set to on, the volume control
of this unit cannot adjust the volume of the speakers con-
nected to this unit. Volume adjustment shall be performed
at the input device side such as the control amplifier con-
nected to the MAIN IN terminal.
Entry of direct output into the MAIN IN terminal from a CD/
DVD player or other devices that cannot adjust sound vol-
ume constantly provides a full power state and accordingly
results in the risk of speaker damage.
For such input devices, be sure to use a control ampli-
fier equipped with sound volume adjustment function as
a relay, generate sound through the speakers with volume
lowered, and adjust the volume to your favorite level.
Toggles the low-frequency cutoff function on and off.
off : Provides the normal state.
on : Cuts the low-frequency range.
2
Names and Functions
5. Mode switch (mode)
Changes the output mode.
mono : Mixes the signals from right and left channels.
stereo : Provides normal stereophonic reproduction.
6. Monitor switch (monitor)
Reproduces the data from the recorder on the monitor.
Selection of ON enables to reproduce the data from the
recorder. Selection of OFF enables to reproduce the data
from the source selected with the input selector.
7. Input selector (INPUT SELECTOR)
Selects an input device from the devices such as a CD/DVD
player and a tuner connected to each input terminal.
This selector has 5 positions consisting of PHONO, CD,
LINE-1, LINE-2, and LINE-3 that correspond to each input
terminal on the rear panel. To select an input source, set the
indicator to the position of the source to be reproduced.
8. Pilot light
Turns orange when the power is turned on.
13. Mute button (mute)
Temporarily mutes the sound. Pressing this button activates
the mute function and blinks the sound volume indicator re-
sulting in no sound generated. Pressing this button again to
cancel the mute function allows sound to be generated.
14. Cartridge selector (cartridge)
Adjusting the input impedance of the amplifier may be re-
quired depending on the impedance of the cartridge to be
used.
The input impedance of the amplifier is selectable with the
cartridge selector.
The selectable positions are MM, MC high, and MC low.
Select a position in accordance with the input impedance
specified in the operating instructions of the cartridge or
your taste.
Cartridge
selector
Impedance 47kΩ 40Ω 2.5Ω
MM MC high MC low
9. Volume control (VOLUME CONTROL)
Adjusts the sound volume.
Sound is not generated when this control is rotated coun-
terclockwise to the end. The sound volume gradually be-
comes higher as the control is rotated clockwise.
10. Remote control photoreceiver (R)
Receives signals from the accessory remote control. Do not
block the front of the photoreceiver.
11. Sound volume indicator
Indicates the sound volume level.
This indicator blinks during the muting time immediately af-
ter turning on the power and at activating the mute function
using the main unit or remote control.
12. Balance (balance)
Adjusts the balance of sound volume between right and left
channels. Rotating this switch counterclockwise causes the
left sound volume to be enhanced, and rotating the switch
clockwise causes the right sound volume to be enhanced.
This switch shall be set to the center position under normal
conditions and rotated to make adjustment if necessary.
15. Headphone jack (phones)
Is used to listen to sound with use of stereo headphones.
Insert the headphone plug into this output jack.
To listen to sound with only use of headphones, set the
speaker selector to off.
16. Tone control for treble
(TONE CONTROL, treble)
Controls the frequency characteristics in the high-frequency
range. When this switch is set to the center position, flat
frequency characteristic is obtained. Rotating the switch
clockwise causes the high-frequency range to be enhanced,
and rotating the switch counterclockwise causes the high-
frequency range to be attenuated.
17. Tone control for bass
(TONE CONTROL, bass)
Controls the frequency characteristics in the low-frequency
range. When this switch is set to the center position, flat
frequency characteristic is obtained. Rotating the switch
clockwise causes the low-frequency range to be enhanced,
and rotating the switch counterclockwise causes the low-
frequency range to be attenuated.
3
For general
type terminal
18 19
2223
2120
242526
Names and Functions
18. Signal ground terminal
(SIGNAL GROUND)
Is a ground terminal for devices to be connected to this unit.
This terminal is used to reduce noise when other devices
are connected, and is connected to an analog player or a
tone arm. This terminal is designed not for safety.
19. Phono input terminals (PHONO)
Are used as an input terminal to connect an RCA pin-plug
cable from an analog player or a tone arm.
20. Line input terminals
(CD, LINE-1, LINE-2, LINE-3)
Are used for high-level signal inputs from a CD/DVD player,
a SACD player, a tuner, a video deck, a TV, and other such
devices. These input terminals offer the same functions.
21. Speaker output terminals (SPEAKERS)
Connects a speaker system. The right speaker terminal
shall be connected to the R side, and the left speaker termi-
nal shall be connected to the L side in consideration of the
polarity (! and @).
4
22. AC inlet (AC IN)
Connects the accessory power cable.
The power shall be supplied from a household wall socket.
23. Main in terminals (MAIN IN)
Provide input to the main-amplifier section when the pre-
amplifier and main-amplifier are separated.
24. Pre-out terminals (PRE OUT)
Provide the output of the preamplifier section. A bi-amp
connection can be performed with a combination of an ex-
ternal power amplifier because this terminal always provides
output regardless of the separate switch setting.
25. Monitor terminals (MONITOR)
Are used to reproduce the line output from the recorder.
These terminals are connected to the output terminal of the
recorder.
26. Record output terminals (REC OUT)
Are used to transmit output signals for recording from the
recorder. These terminals are connected to the line input
terminal of the recorder.
5
Connections and Connection Diagram
Before connections
Before connecting other devices, connect of the accessory
power cable to the AC inlet of this unit.
When connection is performed, turn off the operation switch-
es of this unit and all other connected devices to prevent an
accident caused by unexpected noise.
How to connect power supply
Use the accessory power cable and insert the AC plug in an
outlet on the wall in the room where the unit will be installed.
How to connect CD player, DVD player,
tuner, or other devices
Connect the output terminal of a reproducing device such as
a CD player and the line input terminal (CD, LINE-1, LINE-2,
or LINE-3) of this unit with 2 (R and L) pin-plug cables.
Use caution not to conduct wrong connection between right
and left.
How to connect analog record player
Connect between the output terminal of the analog record
player and the PHONO terminal of this unit with 2 (R and L)
pin-plug cables.
For some types of players, the ground wire from the phono
motor or tone arm should be connected to the signal ground
terminal of this unit.
The output from an analog record player equipped with a
phono equalizer or from an independent phono equalizer shall
be connected to the line input terminal (CD, LINE-1, LINE-2,
or LINE-3) of this unit.
How to connect speakers
Connect the left-channel speaker to the left speaker terminal
of this unit and the right-channel speaker to the right speaker
terminal.
Securely connect the (+) terminal of the speaker system to the
speaker terminal (+) (red) of this unit, and the (-) terminal of the
speaker system to the speaker terminal (-) (black) of this unit.
If the (+) and (-) terminals are reversely connected to either of
the right and left speaker systems, the acoustic phases of the
sound reproduced from the right and left speaker systems
are also reversed. In such a case, be aware that the sound
level in the low range will be reduced and the acoustic stability
will worsen, thus failing in normal stereo playback.
6
SPEAKER SYSTEM (A
)
–
L R
–
++
–
+
SPEAKER SYSTEM (B
)
L R
+
–
CD/DVD PLAYER
RECORD PLAYER
RECORDER
TUNER
L
R
L R
L R L R
7
Operations
Before operations
1. Ensure that the connections are correctly performed.
(Normal playback cannot be achieved with wrong connec-
tion of R, L, !, or @.)
2. When the power is toggled between on and off or the in-
put selector (INPUT SELECTOR) is changed over, set the
volume control to the minimum position in advance.
Playback procedure
1. Press the operation switch after ensuring that the volume
control (VOLUME) is set to the minimum position.
2. Select a connected device to be reproduced with the input
selector (INPUT SELECTOR).
3. Adjust the sound level with the volume control (VOLUME).
4. Operate the tone control (TONE CONTROL) according to
the reproduced source.
How to operate balance control
The balance control allows users to adjust the balance of
sound volume between right and left channels.
When the balance adjustment is not required, the balance
control is set to the center position.
How to operate the tone control
This unit has the tone control (TONE CONTROL) function for
the low-frequency level control (bass) and high-frequency
level control (treble).
The low-frequency level control (bass) works in the low-fre-
quency range. This unit is designed to obtain flat frequency
characteristic when this switch is set to the center position.
Rotating the switch clockwise causes the low-frequency
range to be enhanced, and rotating the switch counterclock-
wise causes the low-frequency range to be attenuated.
The high-frequency level control (treble) works in the high-
frequency range.
As with the low-frequency level control (bass), this unit is de-
signed to obtain flat frequency characteristic when this switch
is set to the center position. Rotating the control clockwise
causes the high–frequency range to be enhanced, and rotat-
ing the control counterclockwise causes the high-frequency
range to be attenuated.
For both the low-frequency level control (bass) and high-fre-
quency level control (treble), the right and left channels inter-
lockingly function.
Safety cautions
Caution
This unit is a vacuum tube integrated 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.
8
How to Use Remote Control
27
28
Effective distance: approx. 5 meters
30° 30°
Remote control (RA-14)
Remote control
The remote control shall be aimed at the remote control
photoreceiver of this unit within the specified angle range
shown in the illustration when used.
27. Volume (VOLUME, i, o)
Adjusts the sound volume. Pressing i or o decreases or
increases the sound volume, respectively.
28. Mute (MUTE)
Temporarily mutes the sound. Activation of the mute func-
tion causes the volume indicator on the main unit to blink,
and no sound is generated. Pressing this button again to
cancel the mute function allows sound to be generated.
[How to load a battery]
1. Put your finger on the battery cover claw on the rear of the
remote control, and slide the cover downward to open it.
2. Put a battery (CR2025) in the battery case as shown in the
illustration.
3. Close the battery cover.
* When the battery starts to lose power, the effective distance
becomes shorter or the unit does not function even though
the switch is pressed. In such a case, replace the existing
battery with new one.
* If the remote control is not used for a long time, the battery
shall be removed from the case.
9
SQ-38u Block Diagram
B1
ECC83 ECC83
ECC83
ECC83
ECC82
ECC82
EL34
EL34
ECC82
B2
MC STEP- UP
TRANSF ORMER
MC high
MC low
MM
MC
MAIN IN
PRE OUT
PHONO
SPEAKE R
TERMIN AL
B
GND
PHONES
SPEAKE R
TERMIN AL
A
CD
LINE-1
LINE-2
LINE-3
REC OUT
MONITOR
INPUT MONI TOR
BALANC E
VOLUME
MOTOR
VOLUME
RIAA
LOW CUT
/MODE
TONE
CONTROL
MUTE
B3
B4 B5-C
OPERATION
AC IN
B5 B4 B3 B2 B1
POWER
REGULATOR
INPUT SELECTOR
RELAY DRIVER
WIRELESS REMOTE CONTROL CIRCUIT
-C
CHOKE
LINE 3
LINE 2
LINE 1
CD
MM
offAB
A
+
B
MC high
MC low
PHONO
CARTRIDGE
LOW CUT
MODE MONITORSEPARATELED PL
SPEAKER
SELECTOR
FUSE
SQ-38u Block Diagram
10
Specifications
Rated output 30W + 30W (6Ω), 25W + 25W (8Ω, 4Ω)
Input sensitivity/input impedance 1.0V / 47kΩ
Frequency response 20Hz ~ 100kHz (within –3dB)
Total harmonic distortion rate 0.5% / or less (1kHz, 30W / 6Ω)
S/N ratio 75 dB or more (IHF-A weighted)
Input 1 phono line (MM / MC high / MC low supported) and 4 lines
Recording input/output 1 line for each of record output and monitor input
Separate input/output 1 line for each of pre output and main input
Output
Circuit Driver: Mullard circuit, output: UL connection
Vacuum tube used 4 pieces of EL34, 4 pieces of ECC83, 3 pieces of ECC82
Accessories
Power supply voltage AC 230V (50Hz)
Power consumption 195 W, 150 W (under no signal)
Max. external dimensions
Weight 20.0kg (main unit only)
* Specifications and appearance are subject to change without notice.
Speaker output A and B (independent selection, both simultaneous
outputs available)
· Remote control · Power cable
· Terminal protection cap · Owner's Manual
· Safety cautions · Coin-type battery (CR2025)
400 x 196 x 310 mm (WxHxD) (terminals and knobs excluded from the
dimension)
11
Before Asking for Repair Services
While the unit is used, an unusual phenomenon may be confused as a malfunction for a certain reason. Prior to asking us
for repair services, please check the table below and read the instruction manual for the subsidiary devices. If the cause of
the malfunction cannot be identified, please contact your dealer.
Problem Cause Solution
No power is supplied even
though the operation switch is
pressed.
No sound is generated.
(for both left and right channels)
No sound is generated on one
side.
Humming sound (boon or zzz
noise) is generated.
· The power plug is disconnected from the
wall outlet, or it is not completely inserted.
· The power plug is disconnected from the
AC inlet, or it is not completely inserted.
· The volume control is set to the minimum
level.
· The mute function is activated. · Cancel the mute function.
· The input selector is not set to the source to
be reproduced.
· Cable connections are incomplete. · Make cable connections securely.
· The output level of the reproducing device is
set to the minimum position.
· The connecting cable is not connected on
one side only.
· The grounding side of the pin-plug cable
has no contact with the terminal.
· The ground wire of the record player is not
connected.
· Insert the power plug in the wall outlet securely.
· Insert the power plug in the AC inlet securely.
· Rotate the volume control clockwise to adjust the sound volume.
· Set the input selector to the source to be
reproduced.
· Adjust the output level.
· Make cable connections securely.
· Be sure to connect the grounding side of
the pin-plug cable to the terminal.
· Connect the ground wire of the record player to the signal ground terminal.
12
· Connections or mounting conditions are incomplete between the cartridge and shell,
or between the shell and tone arm of the
record player.
· The connecting cables are too close to the
power cable.
· Induction noise is picked up from the power
transformer of another device.
· Connect (or mount) the cartridge, shell, and
tone arm securely.
· Keep the connecting cables away from the
power cable.
· Install this unit away from other devices.
LUXMAN CORPORATION, JAPAN
AG00987C59A
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