||125,000yen(around the 1983 time)
The Integrated Amplifier which carried the
technology corresponding to digital one of the Marantz and attained high-quality
sound-ization by Quarters A and AVSS.
In order to aim at coexistence of
the quality at the time of the Oide power which is not clipped at the time of a
high-level, either, and the Koide power which reproduces Loule Bell, a quarter A
circuit is developed and it carries in PM-84.
This quarter A circuit has the structure where one fourth of the maximum output operates with a pure Class-A. And with the output beyond it, it shifts to AB class and the high power operation is enabled.
has realized the smooth shift by controlling a bias current by a high-speed
AVSS (auto voltage shift supply) which shifts output
supply voltage according to power is carried. The power element was operated in
fewest areas, such as distortion and a noise, with the optimal output supply
voltage, and the high quality is realized with all power level from the Koide
power to the Oide power.
Moreover, the unnecessary temperature rise at the
time of low power is suppressed, and the stability is raised.
corresponding to a low impedance is carried out, and power is maintained even if
it changes a speaker impedance to a very low value momentarily.
direct switchpoint is carried and a high SN ratio and high speed signal
transmission are made possible more by power hardwired connection.
The analog-disk play is supported with constituting Phono amplifier from a Phono
customer specific IC and a dual FET.
Moreover, MC input of two positions is
Fundamental part groups including a power-source part are altogether checked severely through a hearing testing, and are exchanging the
part of 100 or more points.
A power-source part carries the high regulation
large-sized transformer of a separate amplifier class, and the newly developed
custom-made electrolytic capacitor, and also in addition to the copper chassis,
has the composition of having thought the tone quality as important, such as
adoption of the copper screw which attains to two thirds of all the using
Sub- wood was an option.
||120W+120W (AB class, 8 ohms, 20Hz - 20kHz)
30W+30W (a pure Class-A, 8 ohms, 20Hz - 20kHz)
190W+190W (4 ohms, 1kHz)
|Output bandwidth (8 ohms, THD 0.03%)
||5Hz - 40kHz
|THD (20Hz - 20kHz, 8ohms)
|Cross modulation distortion
||20Hz-20kHz+0 -0.2 dB
|Dumping factor (8ohms)
||Phono man month: 2.5mV/47kohm
MC: 250 microvolts/100 ohms
Phono High MC: 2.5mV/1kohm
|Output load impedance
||Tape out: 270ohms
|SN ratio (IHF-A network)
Tuner, Aux, compact disk: 100dB
|Phono maximum permissible input
|Tone control property
||Bass: ±10dB (100Hz)
||Width 416x height 146x depth of 410mm
||Sub- wood WPM-84 (4,000yen)