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ES ESAN
te
FEATURES
amplifier. These features help reduce contact
1.
400 W/ch Peak RMS Power With
"Dynaharmony" System
resistance
with
small
signals which
usually
(named series E amplifier)
pose
problems
with
amplifiers
designed
to
The adoption of the ''Dynaharmony" system
reproduce music sources.
(for further details, see page E—4) makes for a
In addition, the power relays feature a blow-
peak RMS power of 400 W/ch (8 ohms) and
out
magnet
type
of construction
and
the
a continuous RMS power output of 200 W/ch
built-in
magnets
combine
to reduce
the arc
(at 8 ohms, from 20 Hz to 20 kHz). This is
between
the contacts which
is also a prob-
then a power
amplifier that can fully cope
lem,
along
with
higher
and
higher output
with music sources with a wide dynamic range.
powers, when large-output signals are cut off.
2.
0.005% Total Harmonic Distortion
They
also
minimize
deterioration
of
the
(1 kHz, RMS power output of 100 W)
contact resistance and other factors..
The class A driver circuit, which is the heart
6.
A Reliable Protection Circuitry for Safety
of the power
amplifier,
contains
a current
The
HMA-8300
adopts electronic protection
mirror circuit. which performs push-pull drive
circuitry, which is composed of a silicon con-
in the power
stage and provides a low dis-
trolled rectifier which shuts down the power
tortion.
amplifier and also of a current limiter which
3.
Accurate Power Meters (Peak Meters)
detects the area of safe operation
(ASO), to
Just. as you would expect in a top-class power
protect
the power
transistors.
Furthermore,
amplifier,
the
HMA-8300
is equipped
with
to protect the speakers, there is a DC voltage
two large, external magnet type power meters
detection circuit which features a high-reliabi-
which
allow
you to check the output
levels
lity design, and
it is always ready to swing
and the balance in level between the left and
into action in the unlikely event that there is
|
right
channels.
These
meters
display
the
an accident.
i
RMS
value of the peak level and also incor-
7.
Large-Capacity Power Supplies for
a Wide
\
porate
a
logarithmic
compression
circuit.
Dynamic Power
This means
that they track accurately pulse
The HMA-8300
contains large-capacity power
'
signals and give easy readout of the signals at
transformers.
There are altogether four elec-
|
any given moment.
trolytic capacitors for the four power supplies
|
4.
A Subsonic Filter that Neatly Cuts Off Ultra-
—
low
earth
impedance
dual
electrolytic
!
Low-Frequency Sound Without Impairing
capacitors
18,000 wF (63 V) for the two +
Sound Quality
power
supplies and two 10,000 uF (125 V}
Undesirable
vibration.
in the ultra-low-fre-
units. They allow the HMA-8300 to reproduce
\
quencies outside the range of hearing gener-
music with plenty of power to spare.
ated by rumble in the turntable and by badly
8.
Sophisticated Design and Streamlined Interior
warped
records helps downgrade the quality
for Tip-Top Performance
i
of the
reproduced
sound.
This is why
the
Hitachi applied a good deal of thought to the
|
HMA-8300 has a subsonic filter with a sharp
internal construction
of the HMA-8300
so
|
attenuation
(15 Hz, 12 dB/oct.).
It neatly
that the most would be made of the electrical
|
cuts off this undesirable vibration.
characteristics. The result is a very streamlined
|
5.
Large-Capacity Power Relays
layout. The model's exterior design is attrac-
provided
in the
output
line of this power
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