Luxman E-250 Manuale utente
Owner`s
Manual
PHONO AMPLIFIER
E-250
Contents
Precautions ············································································································· 1
Features of This Unit································································································ 2
Names and Functions······························································································ 4
Connections ············································································································ 8
Block Diagram······································································································· 10
Specifications ········································································································ 11
Before Asking for Repair Services·········································································· 12
PHONO AMPLIFIER E-250
1
Precautions
Installation place
Install this unit in a location where good ventilation and heat
radiation are assured.
Especially, the installation of this unit where the 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.
Note:
For heat dispersal, do not install this equipment in a confined
space such as a book case or similar unit.
* Note
Wall
*
*
*
Cautions in connecting cartridges
Connect an analog player or a tone arm with the ground ter-
minal of this unit. If the grounding terminal is inadequately
connected, noises including hum may be generated, resulting
in an adverse effect on the S/N ratio.
The pin plugs to be inserted in the input terminals of this unit
shall be pushed in firmly. If the grounding of the terminal is
inadequately connected, noises including hum may be gener-
ated, resulting in an adverse effect on the S/N ratio.
Precautions in connecting with other
components
When connecting this unit to output device, be sure to turn
off the power switch of this unit and all other connected units.
Failure to observe this may generate a strong noise resulting
in speaker damage or cause a malfunction.
The pin-plugs to be inserted in the input and output terminals
of this unit shall be pushed in firmly. If the grounding termi-
nal is inadequately connected, noises including hum may be
generated, resulting in an adverse effect on the S/N ratio.
The sound is not generated shortly 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
shortly after the power supply is turned on.
If the volume control is set to a high sound level before the
time muting circuit is canceled, a large sound will suddenly be
generated. Please be advised that the volume control shall be
set to a low level at first and adjusted after the sound comes
out of the speakers.
Repair and adjustment
When repairs and adjustments are needed, please consult
with the dealer you bought the unit from.
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.
2
Features of This Unit
Outline
This unit is an NF type phono equalizer amplifier supporting
MM/MC cartridges.
Specially selected MC transformer
Two pieces of step-up transformers in which a super permal-
loy core is independently used are mounted. Independence
between left and right channels has achieved richly expres-
sive sound that can be produced only by boosting with a
transformer.
Setting of cartridge load impedance
The load resistance setting function with 4 positions supports
a wide variety of cartridges.
Setting of cartridge load capacity
The load capacity setting function with 4 positions supports
a wide variety of cartridges. Change in high-frequency char-
acteristics allows sound to be adjusted to your favorite tone
quality.
Improvement in S/N ratio
Noise reduction has been achieved by the 2-parallized first
stage of FET, and improvement in the S/N ratio has been
achieved by optimization of ground pattern and ground point.
Selector relays
The selector relays of the high sound quality which are
mounted in the important points of LUXMAN amplifiers also
are mounted.
High-inertia power supply
The high-inertia power supply circuit on which a large-capac-
ity capacitor blocks were combined.
Schottky barrier diode
Schottky barrier diodes that have less switching noises and
higher conversion efficiency to the DC voltage is applied for
the power supply rectifier circuit.
PHONO AMPLIFIER E-250
3
Articulation function
Magnetization of the cartridge or MC transformer that may
cause the deterioration of sound quality can be eliminated
with the use of reproduced sound signals. This function can
exploit the full potential of cartridges and achieve the sound
quality with a sense of openness.
Low cut switch
A low-cut filter is provided to restrain woofer fluctuation gen-
erated due to warped analog records.
Stereo/Monaural
The monaural switch which is useful for playing monaural re-
cords.
Input/output terminals
18 mm pitch RCA input/output terminals allow even high-per-
formance line cables with large plugs to be connected.
Compact chassis design
Compact body design (W 364 mm x D 274 mm)
LUXMAN’s original OFC wires
Original OFC wires are used in the internal shielded wires to
achieve smooth and natural signal transmissions thanks to
the spiral wrap shielding on each core and the non-plating
process on the core wire.
AC inlet
This inlet enables the connection with an external power ca-
ble.
4
Names and Functions
1. Operation switch (OPERATION)
This switch turns on and off the power. When connecting
the input/output terminals, be sure to turn off this switch.
: OFF
: ON
2. Operation indicator (OPERATION)
Blinks during warm-up when the operation switch is turned
on and lights up when the operation state is activated af-
terward.
When the indicator is blinking, the output muting circuit is
activated to mute sound. Please be advised that the volume
control of the input device such as a control amplifier shall
be set to a low level at first and adjusted according to your
taste after sound comes out of the speakers.
3. Mode switch (MODE)
• STEREO
Is used for stereo playback. Select this position under
normal conditions.
• MONO
Is used for monaural playback.
4. Low cut switch (LOW CUT)
Toggles the low-frequency cutoff function on and off. The
speaker (woofer) fluctuation is restrained when a warped
record is played.
• OFF
Provides the normal state.
• ON
Cuts low frequencies of 30Hz or less. (–6 dB/oct)
5. Articulator switch (ARTICULATOR)
This function performs demagnetization by using sound sig-
nals.
When a record is played with the articulator switch set to
ON, the cartridge and step-up transformer are demagne-
tized, and thus the expression of fresh sound is brought
back.
When the articulator switch is set to ON, no sound is gen-
erated or the sound becomes remarkably small during
playback. This is the sign that the cartridge is being de-
magnetized. If the articulator is set to OFF at this point, the
sound suddenly becomes loud. Therefore, do not turn up
the sound volume of the control amplifier or the like. It is
recommended to activate the articulator for approximately
30 seconds before the end of a track of the record.
• OFF
Deactivates the articulator. Select this position under
normal conditions.
• ON
Activates the articulator.
1 53 4 6 92 7 8
Front panel
PHONO AMPLIFIER E-250
5
6. Articulator indicator
Blinks when the articulator is activated.
7. Input selector (INPUT)
Selects an input terminal on the rear panel.
• 1: Input terminal 1 (INPUT-1) is selected.
• 2: Input terminal 2 (INPUT-2) is selected.
8. Cartridge selection switch (CARTRIDGE)
Selects between MM and MC according to your cartridge.
When MC is selected, the MC cartridge selector (9) can
switch between HIGH and LOW and the MC input imped-
ance.
9. MC cartridge selector
When the cartridge selector (8) is set to MC, the MC car-
tridge selector can select an input impedance.
This selector switches between HIGH and LOW according
to your MC cartridge. The input impedance at the MC HIGH
position is 40 Ω, and the input impedance at the MC LOW
position is 2.5 Ω.
6
1413121110
Names and Functions
10. Input impedance selector/
input capacitor selector
The input impedance and input capacitor can be selected
according to your cartridge. The switches in the upper row
are used for the L channel, and the switches in the lower
row are used for the R channel.
The switches 1 and 2 are used for the input impedance, and
the switches 3 and 4 are used for the input capacitor.
Combination of the switches shown in the figure allows the
setting at the L and R channels to be performed at the same
time according to your cartridge specifications or your fa-
vorite pattern.
For the input impedance, 34 kΩ, 47 kΩ, 56 kΩ and 100 kΩ
are selectable, and for the input capacitor, 0 pF, 100 pF,
220 pF, and 320 pF are selectable.
The input impedance is 47 kΩ and the input capacitor is
0pF as factory default settings.
ON
1234
ON
1234
* Switch positions are marked with ■in the detailed drawing
above.
Before changing switch positions, set the sound volume of
connected devices to a low level.
Rear panel
PHONO AMPLIFIER E-250
7
11. Signal ground terminal (SIGNAL GROUND)
Is a ground terminal for devices to be connected to this unit.
These terminals are used to reduce noises when other de-
vices are connected, and are connected to an analog player
or a tone arm. This terminal is not designed for safety.
12. Input terminals (INPUTS)
Are input terminals to connect pin-plug cables from an ana-
log player or a tone arm. There are 2 lines of input terminals
to connecte 2 pieces of analog players or tone arms. The
input selector can select between 1 and 2.
13. Output terminals (OUTPUT)
Use pin-plug cables to connect the output terminals of this
product with the line input terminals of a control amplifier
and an integrated amplifier.
If this terminal is connected to the phono (PHONO) input
terminals of those amplifiers, they may be damaged. Be
sure to connect the terminal to the line input terminal.
14. AC inlet (AC IN)
Connects the accessory power cable.
The power shall be supplied from a household wall socket.
8
Connections
POWER AMP
SPEAKER SYSTEM
L R
CONTROL AMP
ANALOG PLAYER ANALOG PLAYER
L R
L R L R
Indice
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