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Marantz PM550DC

Stereo Integrated Amplifier (1982-84)

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Marantz PM550DC


Power output: 65 watts per channel into 8Ω (stereo)

Frequency response: 10Hz to 50kHz

Total harmonic distortion: 0.03%

Damping factor: 80

Input sensitivity: 0.28mV (MC), 2.8mV (MM), 150mV (line)

Signal to noise ratio: 82dB (MM), 95dB (line)

Output: 410mV (line)

Speaker load impedance: 4Ω (minimum)

Semiconductors: 47 x transistors, 45 x diodes, 8 x IC

Dimensions: 416 x 117.5 x 329mm

Weight: 8kg


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Reviewed Feb 17th, 2019 by saso.g1

Very good amp, reliable, powerful and good looking.

Reviewed Feb 07th, 2019 by vglory88

Amazing amp, considering the going price, half the price of 70's Marantz. I prefer this for rock and dance music over my 2252B, it simply sounds faster, and is just as musical.

Reviewed Feb 15th, 2018 by Col. Colt

I used this integrated amp in my main bedroom system with Polk Monitor speakers and have been very pleased. Good sound, plenty of power, built in EQ and cool lights!

Reviewed Aug 02nd, 2017 by desmo58

I bought mine new not long after it was released in the stores in the early 1980's . The amp performed faultlessly for many decades and only recently needed to be repaired , good going for an electrical device that was used most days for over thirty years to have lasted so long and will used again for a long time to come .

Reviewed Jan 12th, 2016 by zbox

Got mine for 100 used, and it served me really well. Loved having the 5 band equalizer without buying another component. Sounded pretty good, and the VU meter is a nice touch. These early 80s marantz all look cool as heck too!



re: PM550DC

This might help some one with a repair, I bought a non-working PM550DC off eBay, R805 (82Ω 1watt) that supplies the input voltage to Q815 for +15 volt regulator circuit seemed to have burnt out, thinking that was the fault and replacing it, it then turns out R719,R720, R731,R732 (330Ω 0.25 watt) and R739-R742 (120Ω 0.25 watt) were all open circuit. While the manual only indicates the 120Ω as fusible resistors, due to the colouration of all the failed resistors they all appear to be fusible. I have no idea why so many resistors blew at once as the amp shows no tell tale signs of stress/overheating (bulging caps or darkened PCB areas) in the slightest. Stored in a bad place and not shown a lot of love as it had rust and dings, but otherwise seemed hardly used.

Replacing all the failed resistors and the amp works absolutely fine and sounds quite nice even without adjusting the idling current. Regarding these (horrible?) fusible resistors you can't replace them with the the same fusible types as the manual doesn't go into detail on exact fusing characteristics and in my brief reading its not just a case of replacing a 1/4 watt fusible with any other 1/4 watt fusible. I'm guessing using any 1/4 watt fusible would be better than using a standard 1/4 watt resistor, but they are not readily available if at all in the required resistances and power, modern variants that are available seem to start at 1 watt so I just used standard metal film resistors instead. I can only assume a surge or speak terminal (both channels!!) short caused 9 resistors fail at once(?)...

re: PM550DC

I think I’m correct in saying fusible resistors go high with age and will end up way above their original spec. I had the same issue with the same amp. All the 120 ohm ( R739, R740, R741, R742 ) for example measured between 1.3k - 2.6k ohms. I changed all the fusible resistors in this amp and put in metal film resistors with the same value as the originals. So far so good. The idle current sets as it should and it doesn’t overheat.
I had the same with an old Sony TA-F5A that was running too hot. The fusible resistors had all gone high. I swapped them out and it cured the problem and improved the sound too obviously.

re: PM550DC

I'd love to get a user manual for the PM550DC.
Mine works fine but the previous owner had lost the manual.

re: PM550DC

Do you know how to get a user manual ?
Best regards

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