2. amps-preamps
  3. 181479-171531

life span/failure rate of filter capacitors?

(And I assume that the filter caps are the large electrolytic caps with the screw in terminals?)

The reason I am inquiring about this subject is that I stumbled on to an older thread started by someone who had a "filter cap explode" inside his 20 year old Cary V-12 monoblock.  (Which is basically what I have, only mine is a single stereo amp.)

Anyway, I do know the specs on those large caps with the screw in terminals which I am thinking are aka filter caps are 560uf 400v. 

Do these normally give any kind of warning before they let go?  It does occasionally blow the 3A SB AC power fuse on start up. 

TIA for any information/advice on this subject.

immatthewj

Showing 3 responses by sns

sns
3,652 posts
 

If it were my amp I'd do it, minimally it will allay your doubts in regard to their possible failure, and if you're keeping amp for the long term they'll have to be replaced at some point.

sns
3,652 posts
 

I seem to recall reading that thread or another elsewhere with Cary amps of that vintage. I ran Cary SLM100 monoblocks back in day, had the well known issues with Jensen coupling caps, also had issues with maintaining bias on power tubes and occasional fuse blowing, I'd replace those caps just to be safe, lots of inrush current with your amp, stresses the caps.

sns
3,652 posts
 

When I had my Cary amps, I was able to successfully undertake all repairs/upgrades with direct help from Dennis Had, great guy. I know he's no longer affiliated with company so perhaps not so great on servicing his designs?

 

I'd go for the diy route on those caps, as I recall my SLM's, shouldn't be that difficult. I deal with Partsconnexion  quite often, very good supplier. You may also find the caps you need from places like Mouser, Allied.

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