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-   -   Should I replace dry electrolytic capacitors? (http://www.videokarma.org/showthread.php?t=268458)

MadMan 02-02-2017 11:54 PM

Should I replace dry electrolytic capacitors?
 
(K, technically this is test equipment, but it's in the 'tech' category... idk)

I'm talking about those cardboard-covered electrolytic capacitors. Like these big blue ones in my power supply. The unit works, but it does weird things sometimes, like voltage fluctuations. It also EMP's my usb headphones if I get them too close while turning it on (but that might just be inadequate shielding or something). Just wondering if this type of cap is expected to be bad after 50 years, like waxy paper caps are.

https://dl.dropboxusercontent.com/u/...%20psu%202.jpg

https://dl.dropboxusercontent.com/u/...%20psu%201.jpg

(The next calibration due date is 1968. lol)

While we're on the topic of caps, can anyone answer this?

Celt 02-03-2017 07:35 AM

IMO, YES! It won't be that expensive to do....will only take a few minutes and will make the PS way more stable!

Electronic M 02-03-2017 10:46 AM

The non-chassis mount lytics tend to be less reliable than the chassis mount. I've had TVs with a mix and often most of the cans will be good, but the lead/clip mount lytics will be shot.

Ed in Tx 02-03-2017 04:58 PM

1 Attachment(s)
A little hard to verify but sure does look like some crappy soldering on those electrolytics. Eico made kits, I wonder if that was a kit someone built?:scratch2:


I took the liberty of enlarging those solder joints I'm questioning...

http://www.videokarma.org/attachment...1&d=1486162710

Celt 02-03-2017 06:07 PM

No doubt it was a kit.

Olorin67 02-03-2017 10:09 PM

I dont think Ive ever found a cardboard cased electrolytic that was still good. not sure about these blue ones, but the orange ones tend to dry up.

MadMan 02-04-2017 02:11 AM

Quote:

Originally Posted by Celt (Post 3177839)
IMO, YES! It won't be that expensive to do....will only take a few minutes and will make the PS way more stable!

Quote:

Originally Posted by Electronic M (Post 3177855)
The non-chassis mount lytics tend to be less reliable than the chassis mount. I've had TVs with a mix and often most of the cans will be good, but the lead/clip mount lytics will be shot.

Quote:

Originally Posted by Olorin67 (Post 3177902)
I dont think Ive ever found a cardboard cased electrolytic that was still good. not sure about these blue ones, but the orange ones tend to dry up.

Good to know! I'll recap this thingy then.

Quote:

Originally Posted by Ed in Tx (Post 3177880)
A little hard to verify but sure does look like some crappy soldering on those electrolytics. Eico made kits, I wonder if that was a kit someone built?:scratch2:

Quote:

Originally Posted by Celt (Post 3177884)
No doubt it was a kit.

Good eye! They are crappily soldered. But, they are still firmly connected, no cracks. I'll clean it up when I recap. But you know, I don't think it was a kit. It has a stamp on the inside of the case from quality control, says 'TESTED' and the date June 1965.

StellarTV 06-15-2017 11:56 PM

Depends on the capacitor. The cardboard cased wet electrolytics should be replaced with no question.... those are generally multisectional and have brown epoxy in one end, but the "Dry Electrolytic" capacitors... those do seem to have incredible lifespans. They appear as more contemporary traditional axial leaded electrolytics do, and have a rivet holding each lead on. These will always be labelled as a dry electrolytic if in doubt. I still replace them, but every one I've bothered to test after replacement tested OK.


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