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yzh论坛博士
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发表于 2010-04-22 19:35
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出闲置极新经典马兰士PM-84D甲类合并功放，本机全部采用场效应管，甲类放大，输出功率A类25W+25W，AB类100W+100W，重料的MM，MC唱头放大，实试质素很高，声音清纯自然，醇厚细腻，是当年马兰士的经典产品，而且本机由里到外成色都极新，非常难得，个人认为购买二手器材成色是非常重要的，原装100V电压，整机一切正常无修摩 2800（上门自提优先） 13631181133
| Marantz PM-84D | 128,000yen(1986 release) |
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.
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| 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 |
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