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Marantz PM730

Stereo Integrated Amplifier

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Marantz PM730


Power output: 70 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.03%

Damping factor: 60

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

Signal to noise ratio: 85dB (MM), 95dB (line)

Dimensions: 416 x 100 x 300mm

Weight: 8kg



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Reviewed Apr 30th, 2019 by parsecaudio

This series of integrated amplifier was one of the worst ever made in all HiFi history.
PM 230, PM 330, PM 630, PM730. Avoid these amplifiers

Reviewed Apr 03rd, 2016 by tony579

Just bought one of these on Ebay, and while I don't have much to compare it to, I have had more modern amps from Pioneer and other manufacturers that didn't perform half as well.



re: PM730

My review is based mainly on technical examination. I have in my personal collection a PM-630, the amplifier of a all-Marantz system. I had (and sold), after a restoration, a PM-730 last year.
A lot of c-mos switches in signal path, a lot of very cheap integrated circuits, a non-good power stage.
Do you like the distortion of the old C-Mos?
Do you like the 4558 Op amp?
Do you like the voltage current limiter in his power stage?
Do you like the volume - balance arrangement, made with 1980's TV quality ICs?

And then, do you really like this amplifier? Emotional or commercial reason?

Beautiful aesthetics, surely, especially in the complete system. Many people pay a lot for these amps. Other Marantz series are much, much better.
Have you wondered why Marantz failed and was acquired by Philips at that time?

The right use, apart from in an emotional system, is for example to listen to TV at night. One of the best listening for these amps. CMOS are very reliable, much more than mechanical switches.
A daily hard use is good also.

markceras's picture

re: PM730

I bought one and the matching tuner at a Marantz warehouse sale in Chatsworth, CA in 1988. I had it for 15 years in a bedroom system and it worked well and sounded very good. We used it nightly, running the TV through it. These electronics were sold in more deluxe Marantz rack systems, such as the "gold series" American Express had, and in military exchanges. Both were fairly demanding customers so reliability problems would have been quickly flagged. I don't remember hearing of any then. Great for a budget or secondary system.

Dallmon's picture

re: PM730

parsecaudio is VERY wrong! The PM 730 is much stronger than he's giving it credit for. I bought one just for the heck of it for very little money and was surprised at how good it sounds through my Infinity's.

re: PM730

Do not listen to the comment of this person "30th, 2019 by parsecaudio", the amplifier marntz pm730 otdihny device, it has a rich bass, excellent microdynamics, detail, very cool pre-amplifier, all parts otdihny quality and transformer, he beat a lot of models Sony, technics, pioneer!
Take and do not think!

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