life span/failure rate of filter capacitors?

Thanks all.  @ditusa , @arcticdeth  , this is the thread that got me thinking about the subject

and after reading this thread, and a couple of quite recent threads related to the SLP-05, I don't think I want to send anything back to Cary for any reason.

A couple of years ago I took the bottom off of my V-12 to change the coupling caps, and from the looks of it, I wasn't thinking that the filter caps would be too bad a job,  And I was thinking I could probably get some from Partsconnexion?   I remember at the time, someone from another forum (AA) was helping me troubleshoot (via email) the signal caps and his opinion was that the large electrolytic caps were not a common part to fail.  So I kind of put it out of sight/out of mind.  Until I read that thread that I pasted above.

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.

Thanks for the reply, @sns , I remember (and miss) the Dennis Had days. There used to be a wonderful individual (Kirk Owens) in tech support who was quite patient and thorough and walked me through about every problem or upgrade I ever had with one of my CAD products.  I am thinking that Dennis is probably as busy as he wants to be with his Inspire line of SET amps and his preamps. 

Is it your opinion, then, that I should go ahead & replace those 21 year old caps?

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.

Thanks, @sns  , I would like this amp to last longer than I do, if that is possible.

I just got done looking on partsconnexion, & this may not be as easy as I was thinking it would be (finding one with the specs I want).  I'll do a search on the others you mentioned--Mouser, Allied.

If worst comes to worst, I guess I can email Cary & try to buy four of them there.  Back in the 90's I bought a "power-bank kit" (added filter caps and an umbilical cord to attach them with) for another Cary amp I had, and I am going to look, but I am thinking that they were the same value.  Cary's prices for signal caps are crazy, though, and I suspect they would be for filter caps also. 

Regardless, thanks, & I'll look at those other places you listed.