Re: Just a little bulge = bad caps?

There was and is about +/-53v across the capacitors under power. The old Lelon caps I asked about originally were 50v, 85C devices. I replaced them with Vishay/BC Components 63v, 105C units, so I guess even if the old ones were still "OK" by some measure, it's better to have 10-year-newer ones from a better brand with higher ratings.
(I assume it's a better brand; I see Lelon on the bad caps thread but don't see anything about BC in the good or bad brand threads, but the ones I got were the only ones I could find with those specs...

Re: Just a little bulge = bad caps?

eccerr0r:

I started noticing that I was getting light buzzing out of the speakers when the input attenuation pot was turned to about 6 or 7. I searched high and low for the cause, but couldn't find anything in terms of grounding or anything. I'm new to a lot of this, so it wasn't until reading about bad power supply caps that I realized they could even be a source of excessive hum (not to say that's necessarily the cause of my issue).

So long story short I was just kind of digging around and noticed they looked s...

Re: Just a little bulge = bad caps?

Well, OK, then! Thanks, fellows. It's nice when the answer is so straightforward!

Re: Just a little bulge = bad caps?

I pressed on the plastic tops and they didn't give, so I removed them to see what's underneath. As you can (hopefully) see, the metal tops are slightly bulged. I think the schmutz is maybe adhesive to adhere the plastic tops to the metal, but I can't tell...I couldn't see any actual break inthe metal.




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Re: Just a little bulge = bad caps?

Thanks for your replies. The tops are thin black plastic, so I don't know exactly what is going on underneath the plastic. I'll get some photos this evening to show what they look like.

The two Lelon brand filter caps in the power supply section of my stereo amplifier have very slightly (and unevenly) - but definitely - rounded tops. I see on this site that Lelon is a known bad brand. This amp is only like 10 years old, and is a typical solid state class B design; for this type of circuit, from what I've read online, this shouldn't typically be expected, so I just wanted to throw this ultra noob question to the experts and see whether I should recap, or if I'm just making up problems. Thanks.

Re: New Members - please post your introductions here

Hey there everybody, my name's Ben. I work as a database administrator during the day, and find myself falling ever-more-deeply down the rabbit hole of audio and video electronics in my spare time. I found this site while researching the need to replace the power supply caps on a stereo amplifier, and am amazed at the level of information here.