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Do these caps look bulge-y to you?
Do these caps look bulge-y to you?
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Old 13th October 2021, 11:20 PM   #1
soldersmoker is offline soldersmoker  United States
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Join Date: Aug 2005
Default Do these caps look bulge-y to you?

They are the two largest caps (10000 uF/50V) in an NAD 315BEE. I'm getting a loud buzzing noise overlaying the music, over the speakers and through the headphones, and even when the amp is in standby mode.
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Old 13th October 2021, 11:27 PM   #2
Mark Tillotson is offline Mark Tillotson
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Ahem. Forgotten something?
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Old 13th October 2021, 11:29 PM   #3
soldersmoker is offline soldersmoker  United States
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Lots. I'm old.
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Old 13th October 2021, 11:34 PM   #4
bullittstang is offline bullittstang  United States
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Join Date: May 2013
Location: Detroit, MI
Do these caps look bulge-y to you?
You didn’t upload any pics… is what he’s referring to.
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Old 13th October 2021, 11:47 PM   #5
soldersmoker is offline soldersmoker  United States
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Click the image to open in full size.

Ugh. Thanks. I apologize. I need to step away from the amp and the keyboard.
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Old 14th October 2021, 12:19 AM   #6
phase is offline phase  United States
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Had some like that that were maybe in a Parasound amp perhaps. If you push on the slightly crowned part, you might find that they will flatten under the weight of your finger.
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Old 14th October 2021, 12:23 AM   #7
nironiro is offline nironiro  Croatia
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In standby mode those caps should have no voltage.
Could be transformer, or probably some caps that are active in the standby mode.
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Old 14th October 2021, 12:56 AM   #8
Ian Finch is offline Ian Finch  Australia
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Join Date: Apr 2010
Location: Coffs Harbour, NSW
Do these caps look bulge-y to you?
The plastic sleeving of modern electrolytic caps continues to shrink over time and that pulls the rim of the top cover disc down. So eventually, with a little heat to soften the plastic, the centre of the disc rises slightly until you get that domed appearance. In my limited experience, original caps or a full set of replacements, will all bulge the same limited way as your pic shows, without it being a problem. Caps that fail in a bad way and burst or leak from pinholes in the can, do so in different ways - usually all messy ones.
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Old 14th October 2021, 01:58 PM   #9
jaycee is offline jaycee  United Kingdom
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They're SamXon... reason enough to replace them!
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Old 14th October 2021, 06:30 PM   #10
srian is offline srian  Sri Lanka
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Join Date: Jan 2011
When ever I come across the dought about a 10,000uf power supply cap
I would solder a new 10,000 cap through long thick leeds from
the underside of the pcb or suitable point. Then observe whether the
symptom goes away.
In the picture shown above you could peel off the plastic cover with a
knife from the top and look to see whether the aluminum can has
also bloted up.
As a generel rule all electrolytics more than 10 years old should be replaced to
look after(safe guard) the nice piece of equipment you enjoy.
John.
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