Electrolytic filter caps : Pre - installation longevity ?

phsyconoodler

Member
Messages
4,301
One year and then they are unsaleable.Many old ones are still useable as long as you re-form them with a variac,but it's best to get new stock and not worry about that.
So if you see NOS filter caps on E-Bay,don't buy them unless you know how to re-form them or like swapping them in and out of a complete amp build.
We can't see inside filter caps to see if the electrolytic compound is dried out,so why take a chance?
Now I may be wrong here,so those who truly know please pipe in.
 

John Phillips

Member
Messages
13,038
I wouldn't install one over ten years old at all, and not over five years old in a critical application. I don't think I'd draw a line as soon as a year - amps which haven't been turned on for a year or more are usually perfectly OK.

Basically 'NOS filter caps' are an oxymoron though...
 

67super

Member
Messages
1,503
Not in the context of guitar amps but in other applications requireing electrolytic caps I routinly use stock that is over a year old. Like John said I wouldn't use something 10 and maybe even 5 but 1 or 2 years has never been a problem.
 

teleamp

Senior Member
Messages
3,478
I have read somewhere that the shelf life of new production electrolytics is 5 years. After 5 years, reforming is suggested.

MikeY
 




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