EQ-500
VACUUM TUBE PHONO AMPLIFIER
EQ-500
Owner`s Manual
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
VACUUM TUBE PHONO AMPLIFIER EQ-500
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
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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 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.
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 a substance can often damage the exterior.
Precautions in connecting with other
components
When connecting this unit to input/output devices, be sure to
turn off the power switch of this unit and all other connected
units.
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.
1
Features of This Unit
Outline
This unit is a non-feedback CR type phono equalizer ampli-
fier that is configured with the vacuum-tube-equipped SRPP
(Shunt Regulated Push-Pull) circuit.
Non-feedback CR type equalizer circuit
Various high sound quality parts that have been carefully se-
lected are used in this non-feedback CR type equalizer circuit.
Input stage SRPP circuit
The SRPP (Shunt Regulated Push-Pull) circuit that features a
low impedance output, prolonged life of vacuum tubes, and
many other advantages, is used in the phono equalizer sec-
tion.
Specially selected MC transformer
Four pieces of step-up transformers in which a super permal-
loy core is independently used are mounted. Independence
among MC-HIGH, MC-LOW, left and right respectively has
achieved richly expressive sound that can be produced only
by boosting with a transformer.
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.
Vriable cartridge load impedance
The load resistance variable function from 30 kΩ through
100kΩ supports a wide variety of cartridges.
Setting of cartridge load capacity
The load capacity setting function with 6 positions supports
a wide variety of cartridges. Change in high-pass characteris-
tics allows sound to be adjusted to your favorite tone quality.
Switchover of gains
The gain selection switch with 3 positions (36 dB/38 dB/
40 dB) is equipped.
Output transformer
The output transformer with a super permalloy core is
equipped to achieve richly and deeply expressive sound. The
balanced output is also supported.
Analog meter
Analog meters with a sensitivity selection switch are intro-
duced to make various cartridge outputs available. The me-
ter-off function is also equipped. (When OFF is selected, the
meter needles do not move.)
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VACUUM TUBE PHONO AMPLIFIER EQ-500
Thin body design
This unit can be installed in a limited space.
Low cut switch
A low-cut filter is provided to restrain woofer fluctuation gen-
erated due to warped analog records.
High cut switch
A high-cut filter is provided to eliminate scratch noises and it
makes music easier to be listened to.
Stereo/Monaural
The monaural switch which is useful for playing monaural re-
cords is provided.
LUXMAN’s original OFC wires
Our original OFC wires are used in the internal wiring to
achieve smooth 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.
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 that is a combination
of a large-capacity OI-core-type power transformer and a
large-capacity capacitor block is introduced.
Power supply unit
Full wave rectification by a rectifier tube EZ81 (duo diode) and
a choke coil are used.
Input/output terminals
18 mm pitch RCA input terminals and Neutrik made XLR ter-
minals allow even a high-performance line cable with large
plug to be connected.
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