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Marantz PM-84

Stereo Integrated Amplifier (1985-90)

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Marantz PM-84

Specifications

Power output: 120 watts per channel into 8Ω (stereo)

Frequency response: 5Hz to 45kHz

Total harmonic distortion: 0.015%

Damping factor: 90

Input sensitivity: 0.25mV (MC), 2.5mV (MM), 150mV (line)

Signal to noise ratio: 80dB (MC), 92dB (MM), 98dB (line)

Output: 520mV (line)

Dimensions: 416 x 146 x 410mm

Weight: 18kg

Downloads

II schematic   English -

instruction/owners manual   English - danickd

service manual   English - danickd

D instruction/owners manual   English - isidroco

II bias adjustment   English - dacost

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Comments

re: PM-84

Hi everyone,

I personally own a PM84MKII for several years. I've always appreciated its sound, but was soon faced with the STK reliability problem. I alos own a PM-64MKII with similar issues.
In the past few years I had a hard time finding original STK chips... only bad copies instead.

I've developed an input stage with discret components, that mounts right in place of STK, with better cooling capacity. It is greatly inspired from the PM-94 design, with modern (but still high quality) components, adapted to the PM-84MKII.
The result is great! The sound is even improved from the original design! The reason is better components, DC-coupling eliminating the need for a capacitor at the input stage, and it is even possible to separate power supply for each channel (as in the PM-94). The PCB mounts without any mechanical adaptation. Just unsold the STK and a few passive components, then sold the PCB instead, adjust DC bias and idle current, and listen!

I'm willing to build more of my circuits for anyone interested. Feel free to contact me!
Next step I'm adapting it to the PM-64MKII !

re: PM-84

Sounds absolute phenomenal. Very interested. This is the best Iever heard of, because the STK is in other amplifiers as well. Mostly I replace it with the Highest voltage ones STK3152 and mount it on a cooling plate between the heatsinks. The operation temp of the STK is according to Sanyo 25┬║C.
So your solution is much better!!!! Congretulations.

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