
Marantz PM-80 |
65,000yen(around the 1989 time) |
The Integrated Amplifier developed at last the
newest digital source studied in addition to the traditional amplifier
technology of a Marantz.
In addition to a large-sized power transformer,
the special edition electrolytic capacitor of 18,000 micro Fx2 is adopted as a
power-source part.
Moreover, the OFC line of a very thick is adopted as a
speaker circuitry or a power cord.
In order to stop the rectification
noise generated when changing an alternating current into a direct current, the
noise-killer circuitry is carried.
The RF noise near 1MHz is intercepted
from several 100kHz, and reservation of the tone quality without muddiness is
aimed at.
Furthermore, it has succeeded in increasing a low-pass feeling of
power by lowering the primary side circuit impedance of a power source.
Moreover, the noise is thoroughly eliminated by leading about and the
careful circuitry of a product line.
A power stage is the stream
composition which made the power transistor of Pc-100W which was rich in the
linearity the parallel push pull, and is raising the gain as a three-step
Darlington connection.
Moreover, the copper shielding board was mounted on
the power transistor, the radiation from a transistor and an oscillation were
suppressed, and the influence on a very small signal is eliminated thoroughly.
The phone equalizer constitutes low-noise amplifier with the combination
of low-noise FET and IC for audios.
Moreover, by attenuating super-low-pass one of 30Hz or less, modulation
by low frequency was prevented and the still wider dynamic range has been
obtained.
What was selected carefully is used for a part and the high-quality sound
electrolytic capacitor which uses for a separator the paper with which
the fiber type protein fibroin and Manila hemp of silk were mixed is adopted
especially as a signal system.
Moreover, the paper polyesters substrate
excellent in vibration suppression nature is used for the printed circuit board.
When a "first class" and large power are required at the time
of the Koide power, "the Class-A / AB class circuit changing switch"
which can perform proper use of "Class AB" are equipped.
In order to avoid the influence on the
signal current, the circuitry arranged near the power-source block of a voltage
change circuitry is adopted. Moreover, for a bias change, shortest-ization of
distance is attained using remote control by a photo-coupler, and the influence
on a tone quality is suppressed to the minimum.
The Source-Direct
switchpoint into which the conventional direct switchpoint was developed further
is equipped.
All of switchpoints and tone control circuits, such as not the
defeet of a tone control but a tapes monitor and a processor, are jumped, and it
is direct inputted into power amplifier through an exclusive volume.
Five input terminals and three tapes input/output terminals are carried.
Moreover, it is also possible to also carry the processor termination and to
connect a graphic equalizer etc.
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Form |
Stereo Integrated Amplifier
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Output power (20Hz - 20kHz, both channel simultaneous drive) |
Class AB : |
140W+140W (4ohms)
120W+120W (6ohms)
100W+100W (8ohms) |
Class A : |
20W+20W (8ohms)
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Dynamic power |
Class AB : |
340W+340W (2ohms)
220W+220W (4ohms)
170W+170W (6ohms) |
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THD (1kHz, 8-ohm load intensity)
|
0.0008% |
Cross modulation distortion (SMPTE)
|
0.008% |
Output bandwidth (an 8-ohm load intensity,
0.03%) |
10Hz - 50kHz |
Frequency characteristic |
compact disk and a Source Direct:
10Hz-100kHz+0 -3 dB |
Dumping factor |
180 (an 8-ohm load intensity, 20Hz - 10kHz)
|
Input sensitivity/impedance |
Phono MC: 250 microvolts/100 ohms
Phono
man month: 2.5mV/47kohm
High SFT Level: 150mV/33kohm |
Phono maximum permissible input (1kHz)
|
MC:16mV
MM:160mV |
RIAA deflection (20Hz - 20kHz) |
±0.2dB |
SN ratio (A network) |
Phono MC:75dB
Phono MM:85dB
High
Level:105dB |
Tone control |
Bass: 100Hz, ±6dB
Treble: 10kHz, ±6dB
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Power source |
AC100V, 50/60Hz |
Power consumption |
220W (Electrical Appliance and Material
Control Law) |
Dimensions |
Width 454x height 165x depth of 380mm
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Weight |
17.5kg |
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