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Old 17th December 2012, 08:44 PM   #1
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Default Atention !! Marantz PM 17 series users

Marantz PM 17 series feature a couple of capacitors of 33nf or 333J located directly on the binding post .

I cant exactly imagine the use of them but i can see it as an additional zobel ?? Good ..they tend to fail also fail partially

Unit might play in very low or low power but increasing the power will short the cap and protection will kick in ...

FUNNY PART OF THE STORY

amplifier was in the service center where the tech replaced almost every diode , every zener ,VBE multiplier , all transistors ,drivers and outputs to locate the fault ( probably thinking that protection kicks in for DC reasons ) keep the amp there for more than a month and asked the costumer to allow one more month for proper fault finding ...

Guys i am laughing my brains out !!!
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Old 17th December 2012, 09:17 PM   #2
jaycee is offline jaycee  United Kingdom
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ive seen capacitors directly across the output terminals on several amps. I presume it is about emissions control.
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Old 18th December 2012, 07:38 PM   #3
Vostro is offline Vostro  South Africa
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I can imagine how crappy that problem would be to find.
But I've also wondered the purpose of similar capacitors.

Here is a picture from a Yamaha A-S700.
And I'm not sure why all the caps on the speaker terminals,
I thought loading the amp output with capacitors would provide instability.

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Old 11th May 2014, 07:06 AM   #4
jimchan is offline jimchan  Norway
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I have this amp.... really authorative and laid back sound.

It is now 8 years old and considering swapping the out the power caps. Do you recommend swapping these across the terminals as well?
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Old 11th May 2014, 08:05 AM   #5
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Quote:
Originally Posted by jimchan View Post
. Do you recommend swapping these across the terminals as well?
Come on, that's what this entire topic is about.

Quote:
Click the image to open in full size. Atention !! Marantz PM 17 series users

Marantz PM 17 series feature a couple of capacitors of 33nf or 333J located directly on the binding post . they tend to fail also fail partially
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Old 11th May 2014, 08:59 AM   #6
jimchan is offline jimchan  Norway
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Anything useful to add or just spamming ? ;-)

Last edited by jimchan; 11th May 2014 at 09:05 AM.
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Old 11th May 2014, 08:49 PM   #7
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Originally Posted by jimchan View Post
.....It is now 8 years old and considering swapping the out the power caps. Do you recommend swapping these across the terminals as well?
Assuming you refer first to the main reservoir electrolytic caps in the power supply, 8 years is way too soon for them to need replacing unless they were total rubbish - but only such electrolytic caps dry out and fail. They can be measured to evaluate their condition. Other solid dielectric types such as film and ceramic should last indefinitely.

Unless you just want to change something in the amplifier for something to do, it shouldn't need any replacement caps inside 20 years.
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Old 12th May 2014, 02:49 PM   #8
jimchan is offline jimchan  Norway
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Aha, thanks Ian.

If this is the cap lifetime, then I will leave the amp alone! They are Gold Tunes, so certainly premium. I have a Honey Badger Build I can work on instead.

The Marantz sounds very powerful and authoritative, can listen for hours. Although have to say it is not an exciting amp - it is very laid back.
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