Caps leaking? - Yamaha A1020

bjorn1011 · 21st April 2010, 07:11 AM

I adjusted the idle current on my Yamaha A1020, and noticed some residue at the base of two pairs of caps (see pictures). Is this just glue as I have read something about this, or should the caps be replaced? I do not notice any changes in the sound.

The first pair of caps are Rubicon Black Gate F 25V 1000uF:

The second pair are Nichicon 25V 1000uF:

This is a newbie question, so sorry if the answer is obvious.....

Also, sorry for the picture quality - if required I can try to get better pictures.....

If I need to replace the caps, I would appreciate suggestions of what caps to by, and where to by them... The Rubicons are part of the power supply circuit and the Nichicons are part of the Eq amp.

amc184 · 21st April 2010, 10:25 PM

The caps in the second photo are definitely glued. Leaking electrolyte isn't very thick, it won't pile up against a cap like that.

The caps in the first photo might be leaking, but I can't really tell. That's not a great photo. Is the brown stuff corroding the surrounding components?

If the amp is more than 15 years old and you still want to get the best out of it, you should be looking at replacing the caps regardless of whether they are leaking or not.

Glowbug · 21st April 2010, 10:48 PM

Quote:

If I need to replace the caps, I would appreciate suggestions of what caps to by, and where to by them..

Mouser & Digi-Key would be the places I'd check first

And yeah...a re-cap would be a good idea anyway. Very simple fix.

Welcome to DIYAudio

Enzo · 22nd April 2010, 02:57 AM

In both cases, that looks like glue to me. PArts that stick up from the board are more likely to vibrate back and forth and crack free of their solder. Manufacturers often glue larger parts down to prevent this.

21st April 2010, 07:11 AM	#1
bjorn1011 diyAudio Member Join Date: Apr 2010	Caps leaking? - Yamaha A1020 I adjusted the idle current on my Yamaha A1020, and noticed some residue at the base of two pairs of caps (see pictures). Is this just glue as I have read something about this, or should the caps be replaced? I do not notice any changes in the sound. The first pair of caps are Rubicon Black Gate F 25V 1000uF: The second pair are Nichicon 25V 1000uF: This is a newbie question, so sorry if the answer is obvious..... Also, sorry for the picture quality - if required I can try to get better pictures..... If I need to replace the caps, I would appreciate suggestions of what caps to by, and where to by them... The Rubicons are part of the power supply circuit and the Nichicons are part of the Eq amp.

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21st April 2010, 10:25 PM	#2
amc184 diyAudio Member Join Date: May 2007 Location: Christchurch	The caps in the second photo are definitely glued. Leaking electrolyte isn't very thick, it won't pile up against a cap like that. The caps in the first photo might be leaking, but I can't really tell. That's not a great photo. Is the brown stuff corroding the surrounding components? If the amp is more than 15 years old and you still want to get the best out of it, you should be looking at replacing the caps regardless of whether they are leaking or not.

22nd April 2010, 02:57 AM	#4
Enzo diyAudio Member Join Date: Sep 2004 Location: Lansing, Michigan	In both cases, that looks like glue to me. PArts that stick up from the board are more likely to vibrate back and forth and crack free of their solder. Manufacturers often glue larger parts down to prevent this.

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