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Marantz PM-84D 128,000yen(1986 release)

Description
 
It is the Integrated Amplifier which attained high-quality sound-ization of compact disk based on PM-84.

In PM-84D, MOS FET is carried in the output stage.
MOS FET has the outstanding switching characteristic, a distorted property, and a heat characteristic, and has a property ideal as a power amplification element. The parallel push pull stream composition by this MOS FET is adopted, and MOS FET of both eight channel is adopted.

The MOS FET parallel push pull stream-composition output stage is controlled for Quarters A and AVSS.
The quarter A operated with the pure Class-A to 1/4 (quarter) of the maximum output, and 25Wx2, by more than it, it shifted to AB class automatically and high power has been obtained. It is reproducible, maintaining the linearity which was excellent in the vast power area by this.
Furthermore, in AVSS, the change of a pure Class-A and AB class is interlocked with, output supply voltage is shifted, and the power element is driven in the ideal conditions.

The compact disk/Phono direct switchpoint is carried.
compact-disk direct is directly linked with flat amplifier only by passing along a volume, and a Phono direct is played in phone amplifier / volume / flat amplifier / the power amplifier shortest path.
The purer amplification is enabled because digital one and an analog let a necessary minimum stage pass.

The Phono input carries the circuit changing switch of man month/MC(High)/MC (Low), and supports various cartridges.

A power-source part is filled up with a resin in order to raise the heat-dissipation effect, and the newly developed custom-made mass capacitor consisting mainly of the high three-fold regulation shielding large-sized transformer which eliminated the magnetic flux leakage, and a 76,000-micro F electrolytic capacitor is carried in it.

In order to elaborate a final tone quality, the tuning by the thorough listening comprehension test used non-magnetic material for the fraction which can consider influences of an eddy current, such as an in-use cage, a chassis, a screw, repeatedly positively, and has adopted the copper plating chassis and the copper plating screw as it.
Furthermore, he examines the part of 100 or more points by a hearing, and the tone quality is raised.


Rating of a mode
Form Integrated Amplifier
Output power (20Hz - 20kHz, both channel drive) AB class: 100W+100W (8-ohm load intensity)
Pure Class-A: 25W+25W (8-ohm load intensity)
Output bandwidth (8 ohms, THD 0.03%) 5Hz - 40kHz
THD (20Hz - 20kHz, 8ohms) 0.015%
Cross modulation distortion 0.015%
Frequency characteristic 20Hz-20kHz+0 -0.2 dB
Dumping factor (8ohms) 120
Input sensitivity/impedance Phono man month: 2.5mV/47kohm
Phono MC: 125 microvolts/100 ohms
Phono High MC: 2.5mV/100 ohms
High SFT Level: 150mV/30kohm
RIAA deflection 20Hz-20kHz±0.2dB
SN ratio (IHF-A network) Phono man month, High MC (2.5mV): 90dB
Phono MC (125 microvolts): 76dB
High Level:100dB
Phono maximum permissible input (1kHz) man month, High MC: 150mV
MC:7.5mV
Tone control property Bass: ±10dB (100Hz)
Treble: ±10dB (10kHz)
Subsonic-Filter property (-3dB) 16Hz, 6dB / oct
Supply voltage AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 320W
Dimensions Width 458x height 146x depth of 410mm
Width 458x height 164x depth of 450mm (maxima)
Weight 19.8kg