Hitachi HCA-7500 - Installation Guide; Product Features

INSTALLATION
When
installing
the
HCA-7500
choose
a
place
that
satisfies
the
following
conditions.
1;
2.
3.
4.
A
place
out
of
direct
sunlight
and
away
from
stoves,
etc.
A
place
where
ventilation
is
good
and
which
is
free
from
moisture
and
dust.
Install on a stable and vibration-free surface.
Hum
noise
is
sometimes
generated
if
the
metal
parts
(like
a
cover)
of
another
audio
component
come
into
contact
with
the
unit,
so
leave
proper
clearances.
Do not allow the metal parts of
another audio component to come into
contact with the unit.
TUNER
CASSETTE DECK
reryxT a HABBO OO
HCA-7500
WARNING:
TO
PREVENT
FIRE
OR
SHOCK
HAZARD,
DO
NOT
EXPOSE
THIS
APPLIANCE
TO
RAIN
OR
MOISTURE.
FEATURES
1.
ICL Equalizer Circuit for High-Fidelity Record Reproduction
The
equalizer
circuit
features
a
3-stage,
direct-coupled
5-transistor
circuit
(differential
FET
for
first
stage,
PNP
differential
transistor,
constant
current
drive
NPN
transistor)
for
a
low
distortion
and
a
high
S/N
ratio,
as
well
as
for
high
stability.
There
are
no
coupling
capacitors
in
the
input
stage
with
the
ICL
(input
capacitor-less}
system,
while
the
output
stage
employs
metalized
polyester
film
capacitors
which
are
non-inductive
and
which
feature
a
superior
high-frequency
response,
These
features
improve
the
frequency
characteristics
and
the
phase
characteristics.
. RIAA Elements with +1% Tolerance Parts
The
RIAA
elements
employ
metal-film
resistors
and
styrol
capacitors
with
a
+1%
tolerance.
These
parts
are
based on
MIL
standards
and
display outstanding
temperature
characteristics.
The
RIAA
deviation
across
a
20
Hz
—
20
kHz
frequency
band
is
designed
to
be
less
than
+0.2
dB.
. Low-distortion, Low-noise Tone Control Circuit
This is a 3-stage, direct-coupled 6-transistor circuit (differential FET for first stage, constant current drive PNP
transistor
push-pull)
which
not
only
makes
for
low
distortion
and
a
high
S/N
ratio,
but
also
provides
high
stability.
. Tone Controls for Each Channel with New Tone Control Circuit
The HCA-7500 adopts a new tone defeat control between the bass and treble controls. Furthermore, any de-
viations in the perfect tone balance between the left and right channels, caused by the positioning of the
speakers, for example, can be compensated for.
. Low Filter that Neatly Cuts off Wow and Ultra-low Frequency Rumble without Impairing Sound Quality
The low filter can cut off wow and rumble in the ultra-low frequencies (15 Hz, 12 dB/oct.) without impairing
the quality of the reproduced sound.
. New 32-contact 4-gang Attenuator Volume Control
This control enables very fine adjustments across a wide range of 0 to 70 dB, yielding accurate attenuation
without producing any deviation between the left and right channels. In addition, the 4-gang volume control
improves the signal-to-noise ratio when set to low-volume levels.
. Built-in Muting Circuit with Reed Relays
The muting circuit is actuated for about 5 seconds through the reed relays so as to suppress shock noise when
the amplifier is switched on.
. Excellent Operability, Sophisticated Design
All the switches and the controls are designed and positioned in keeping with the principles of human engi-
neering for optimal operational ease. The amplifier’s exterior is appealingly solid and sophisticated. Hitachi has
managed to make the operation of the 32-contact attenuator volume control and all the other front panel
switches and controls not only easy but also accurate.
E-2