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Old 02-03-2017, 12:54 AM
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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.





(The next calibration due date is 1968. lol)

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

Last edited by MadMan; 02-03-2017 at 12:57 AM.
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Old 02-03-2017, 08:35 AM
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IMO, YES! It won't be that expensive to do....will only take a few minutes and will make the PS way more stable!
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Old 02-03-2017, 11:46 AM
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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.
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Old 02-03-2017, 05:58 PM
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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?


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

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File Type: jpg eico-badsoldering1.jpg (71.7 KB, 82 views)
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Old 02-03-2017, 07:07 PM
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No doubt it was a kit.
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Old 02-03-2017, 11:09 PM
Olorin67 Olorin67 is offline
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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.
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Old 02-04-2017, 03:11 AM
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Quote:
Originally Posted by Celt View Post
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 View Post
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 View Post
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 View Post
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?
Quote:
Originally Posted by Celt View Post
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.
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Old 06-16-2017, 12:56 AM
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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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