Audio Database

The

Marantz PM-94 228,000yen(around the 1985 time)

Description
 
The Integrated Amplifier which supplied the separate amplifier technology of the Marantz.

The output stage has triple push pull composition which adopted MOS FET.
MOS FET "can respond also to high resisting pressure and large electrification, while it has a good RF property". "in order to operate only by a majority carrier theoretically,It has the distinctive characteristicses, such as implementation being" and "the turn-off time being shortened extremely and a fast switching being possible, since there are few store-recording effects at the time of switching", for the high input impedance more than J-FET, and the ideal operation is conjointly realized with the quarter A original with a Marantz.

The original quarter A circuit is adopted, one fourth of the maximum output performs a perfect pure Class-A operation, and the maximum output beyond it shifts it to AB class operation automatically. This auto shift is controlled by the electronic control, detects the Output voltage of a main amplifier and is controlling the bias current by the fast-switching circuitry.
In PM-94, rather than the conventional quarter A circuit, the detection velocity is improved and the more smooth control is enabled.

In order to fully demonstrate the performance of MC cartridge, a two-piece right-and-left independency is achieved, and the highly efficient MC transformer is carried in MC input.
With 2 coil stream compositions, the double shielding of the orientation of a core and the orientation of a coil is used for this transformer, and it has obtained the quality for which the high-quality sound MC transformer "MC1000" is pressed.
Moreover, the boost ratio serves as a High-Low change type.

The large-sized transformer and the 90,000-micro F large-sized electrolytic capacitor are carried in the power-source part.
The three-fold silicon-steel-plate shielding was performed, and the measures against flux are thoroughly taken especially against the toroidal transformer.

The material "raincoat tightness" of the copper plating steel plate was extensively adopted as the chassis, and the effect more than the conventional copper plating has been acquired by the raincoat tightness of uniform copper plating finish on it.

The thorough tuning, such as adopting the parts examined in the hearing, is performed.
A pair electrolytic capacitor equivalent also to a property and a tone quality and each switchpoints which carried out the tone-quality modification by copper plating were adopted, and also the 70-micron-thick circuit board and an oxygen-free-high-conductivity-copper product-line code are supplied.
Moreover, in order to eliminate the tone-quality transition by a pewter, the capacitor was used as the screw stop and all screws have adopted the copper plating screw.

compact-disk direct position is carried. By this position, stages, such as an input selector tapes monitor, are jumped and it is directly linked with flat amplifier from a direct master volume. And most transitions of an input impedance can disregard flat amplifier also to a resistor transition of the master volume itself for an FET input.

The HiFiVCR monitor position is carried and the music play by HiFiVCR can be enjoyed with the same sensation as a tapes monitor.

Rear
Quarter
Raincoat
Part
MOS FET
MC
Toroidal
Electrolytic

Rating of a mode
Form Integrated Amplifier
Output power (20Hz - 20kHz) 35W+35W (a pure Class-A, 8ohms)
140W+140W (AB class, 8ohms)
220W+220W (AB class, 8ohms)
Output bandwidth (THD 0.008%, 8ohms) 10Hz - 40kHz
THD (20Hz - 20kHz) 0.01% (4ohms)
0.005% (8ohms)
Cross modulation distortion 0.005%
Frequency characteristic 20Hz-20kHz+0 -0.2 dB
Dumping factor 120 (8ohms)
Input sensitivity/impedance Phono man month: 2.5mV/47kohm
Phono MC (High): 350 microvolts/40 ohms
Phono MC (Low): 125 microvolts/three ohms
Tape, Tuner, compact disk, Aux:150mV/25kohm
Output load impedance Pre out: 220ohms
RIAA deflection 20Hz-20kHz±0.2dB
SN ratio (IHF-A network) Phono MM:90dB
Phono MC:76dB
Tape, Tuner, compact disk, Aux: 100dB
Phono maximum permissible input MM:220mV
MC:24mV
Tone control Bass: ±10dB (100Hz)
Treble: ±10dB (10kHz)
Supply voltage AC100V, 50Hz/60Hz
Power consumption 395W
The maximum Dimensions Width 454x height 146x depth of 410mm
Weight 23kg