how old is this cap?

[innkeeper]

I'm  wondering if anyone could put a manufacturing date range on the below cap.
it has no scoring on the top for it to blow out, nor vent hole on the bottom.
also has a phenolic base that i assume caps the rubber seal. and no date code on the can anyplace that i can find.

[Ampera]

I would guess late 70's to mid/late 80's. Hell of a range, but that's my uneducated guess.

[T3sl4co1l]

Take another side picture showing the temperature, type designation, and anything else that's written on there.

Or, just search for it -- should be able to find a current or discontinued datasheet for the product line.  If it doesn't have an obvious production date code on it already, that should at least give some clues as to when the line was active.

I'd think it's still fine to use for, say, mains frequency filtering, assuming it still tests well.  If it's 85C, it's not going to be very good for switching supply duty anyway, if that's what you were hoping.

Tim

[innkeeper]

Take another side picture showing the temperature, type designation, and anything else that's written on there.

Or, just search for it -- should be able to find a current or discontinued datasheet for the product line.  If it doesn't have an obvious production date code on it already, that should at least give some clues as to when the line was active.

I'd think it's still fine to use for, say, mains frequency filtering, assuming it still tests well.  If it's 85C, it's not going to be very good for switching supply duty anyway, if that's what you were hoping.

Tim

here ya go, also added them to the original post.
I've reformed 4 of them so far. They have reformed fine and seem to be doing well as linear PS filter caps.

[innkeeper]

is N8134 a date code, could it really be 34th week of 81?

[tooki]

That is what I instantly thought when I saw that. Absent information that it's some other code, I would assume that's the date code, exactly as you parsed it.

[Ampera]

is N8134 a date code, could it really be 34th week of 81?

It's not the 81st week of 34.

[ElektroQuark]

is N8134 a date code, could it really be 34th week of 81?

It's not the 81st week of 34.

You sure? 

[Ampera]

is N8134 a date code, could it really be 34th week of 81?

It's not the 81st week of 34.

You sure? 

Welp, Nichicon wasn't around until the 50's, so yeah.

[ElektroQuark]

You missed the 

And 81 are to much weeks for a year.

I was joking.

[wraper]

is N8134 a date code, could it really be 34th week of 81?

Sounds plausible, should be around this old as this cap does not have safety vent on top and has phenolic bottom.

[Ampera]

You missed the 

And 81 are to much weeks for a year.

I was joking.

Ah, good m9, but it was I who tricked you out for you fell into the trap of my running with the joke longer than you did.

Well played.

[T3sl4co1l]

Welp, Nichicon wasn't around until the 50's, so yeah.

But Doc, all the best stuff is made in Japan!

Tim

[Cubdriver]

is N8134 a date code, could it really be 34th week of 81?

It's not the 81st week of 34.

You sure? 

So mid 1935?   

-Pat

[Ampera]

Welp, Nichicon wasn't around until the 50's, so yeah.

But Doc, all the best stuff is made in Japan!

Tim

Was gonna make a joke like maybe it fell off the Delorean, but then why would it be time stamped 20 years before the company opened it's doors?

[innkeeper]

81st week is the first hint that time travel does exist.

[Ampera]

81st week is the first hint that time travel does exist.

If time travel exists, it has to have been already invented. It's impossible for a time machine to come back to the past because the future hasn't happened yet. The future has to happen before, if possible, we can go to the past, as there is nothing that in a way pre-runs the future to check if there is something to come to the past. In away it's like going on one end of a Y fork, with the base being the future, and then to time travel you go back through the other tine.

If you were, however, to change the past timeline in a way that would make it impossible for your birth to occur, unless you were using a time travel method that allowed you to exist in your future while interacting in the past (essentially putting you in a bubble where you exist in your present while you interact with the past) you will not Marty McFly disappear into nothing, as there would be nothing to force you out of the past into limbo. You would just remain there, progressing as if that time line had always existed, just with you existing in it. That being said, there is no way to tell if we have already experienced either of these possibilities. In the future if there happens to be a time traveler from what would have been our future, they are lying as they are from a different future that has come back to our timeline (an event that would be impossible to perceive to us).

See this is what happens when you give a man too much free time, he ponders the meanings and logic behind the universe and ends up confusing everybody. Bugger.