Audio Database


Marantz PM-90 160,000yen(1991 release)

Amplifier which tackled "the limits of a stereo image" which can also be said to be the brand identity of a Marantz, and "a modification of S/N on Hearing impression" from the front view, and brushed up the basic performance thoroughly.
It was developed in pursuit of the sound quality in a real busy condition rather than the catalog spec.

The 4-unit active volume scheme which prevents a failure of S/N at the time of a real using is adopted.
When a volume is extracted, the remains noise of the pre part was stopped according to an input signal becoming small, and high S/N is gained.

A power amplifier part builds the voltage amplification part of a high-speed and a low-impedance specification which made full use of a cascode technology, and constitutes the bipolar transistor from a parallel push pull in the power stage.
Furthermore, MOS FET was used for the driver stage and the electric cross interferencee is prevented.

The power-source parts are two power transformers with + and the powerful stream composition of total 500VA which made each of - take charge of.
Moreover, the orientation of an electric current of two transformers is set up conversely, and it is considered so that mutual leakage flux (leakage flux) may be negated.

The influence of an oscillation is suppressed by having adopted zinc die-casting as a chassis, and also fixing firmly by the top panel and die-casting side panel of 3mm thickness.

AC polarity indicator which can check the polar correction of a power cord at a glance is carried.

Power-source Zinc

Rating of a mode
Form Stereo Integrated Amplifier
Output power
At the time of a Class-A operation : 25W+25W (8ohms)
At the time of AB class operation : 180W+180W (4ohms)
150W+150W (6ohms)
130W+130W (8ohms)
THD 0.0015%
Frequency characteristic 10Hz-100kHz+0 -3 dB
SN ratio High Level:111dB
Input terminal compact-disk balance input: One line
Line input: Four lines
Phono input: One line
Tape input: One line
Processor input: One line
Output-terminal Tape output: One line
Processor output: One line
Speaker output: Two lines
Power consumption 290W (Electrical Appliance and Material Control Law)
Dimensions Width 454x height 170x depth of 460mm
Weight 27.0kg