Audio Linear Power Supply (LPS)

[Bugmanscj]

Hi: Found this forum fumbling over the net looking for replacement capacitors for a high quality 2uv ripple model Kaia, Core Audio Technology LPS. I bought it used on fleabay and figured I would have to recap and sure enough one of the 22,000uf 35V 105c caps is bulging. These supplies were made briefly around 2014 for MAC Mini audio servers, and were quite costly at the time ($1.7k), you know it's audio... I will use it for a video processor power supply to replace a switched version. I figure it's a low cost attempt to see/hear what difference it might make in my system. Plus I get to learn something regarding electronics repair. I've done quite a bit of it, but not in computers and sensitive devices. I'm getting an ESR meter (Atlas Peak) to test things out.

In the search for capacitor replacements I'm restricted to 30mm dia. (cramped board) which really limits my choices to only Rubycon.

Question: When you choose a capacitor for such and application do you look for high ripple current handling? I assume that a higher current capability would be best for a given temp specification. For example it can handle more current at the same temp as a lower amp rating. Thus the question.

Thanks,

[stj]

thanks for the diameter,
but you need to add if it uses 10mm pitch pins or screw terminals - among other info
i have NEVER seen a large cap bulge btw, it should be physically impossible because they have a physical vent valve on the base usually.
post photo's

[Bugmanscj]

stj: They are 10mm pitch pins and it's 50mm in height. Hard to find anything else on these old caps from Nippon Chemicon except M-20% tolerance. See attached photos. The overview of the unit shows the purple large cap on the front right. The dome is raised a bit compared to the rest, so figuring that was starting to bulge (on it's way at least). The closeup (front left cap) shows it as well, plus it is an indentation about half way down on the right. Just not the same as the other caps.

Am I over reacting to a slight deformation in the cap? I'll know a little more tomorrow when my amazonian Atlas Peak ESR meter comes in. Just being very cautious as this is powering a very expensive Lumagen Radiance Pro 4446.

[stj]

it does look suspect.
cut the plastic cover off it to verify it.
what is the series code? it's a 3 letter code probably ending in G
is it KMG??

[Bugmanscj]

KMG confirmed. I tried searching it at Chemicon but no luck.

[stj]

here

[Bugmanscj]

Thanks. Doesn't have the 22000uf listed. Strange.

[Bugmanscj]

it does look suspect.
cut the plastic cover off it to verify it.
what is the series code? it's a 3 letter code probably ending in G
is it KMG??

I cut the cover off and found the metallic seal intact with no cracks/fissures along the breakable edges (the x pattern). I will report back if there are ESR issues, but I expect it will test OK. Something to keep an eye on over the next few years. Likely will examine yearly.