Marantz PM-90

October   1 9 9 1 october 1991
1 9 9 6 1996

Part of the Philips/Marantz high-time (sound-wise and sales-wise), the PM-90 is one of the three top amplifiers of a constantly upgraded and plethoric lineup which included the PM-80, PM-80a, PM-80aF, PM-88SE, PM-88aSE, PM-95 and PM-99SE - plus a few more export-only variants !

The PM-90 rests on a zinc diecast base and is powered by 2x 250VA current-reversed EI trafos producing clean but hot Class A music (the unused portion of which heats up a 3mm aluminium top plate) or more efficient but ample Class AB power.
The sideburns are diecast aluminium, as in the CD-95 or PM-95, for a 27kg total of educated high-fidelity.

The volume is "active" by balancing the actual input and output levels to lower residual noise at all levels - see the schematic below.
The cascode power stage ends on parallel p-p of bipolars while drivers are MOS-FETs ; one CCNE "noise killer" is inserted in the power amp section's feed and, very Luxman, a Line Phase sensor on the back.

A real PM-90 here ; nudies of others here and here.

Marantz PM-90, image 1 Marantz PM-90, image 2 Marantz PM-90, image 3 Marantz PM-90, image 4
Marantz PM-90 specifications
Title Value
Class A power output : 2x 25W (8 Ohm)
Class AB power output : 2x 180W (4 Ohm)
2x 150W (6 Ohm)
2x 100W (8 Ohm)
THD : 0,0015%
Frequency response : 10Hz...100Khz (+0 / -3dB)
SN ratio : 111dB (final stage)
Inputs : 1x CD balanced
1x CD
2x aux
1x tuner
1x phono
1x processor loop
3x tape
Outputs : 3x tape
1x processor loop
2x speakers
PC : 290W
Dimensions : 45,4 x 17 x 46cm
Weight : 27kg.
List price : 160,000¥
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