ZRT crossover capacitor damage? - diyAudio
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Old 31st July 2014, 08:35 AM   #1
Thedaus is offline Thedaus  Australia
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Default ZRT crossover capacitor damage?

Hi,

A few years ago I started building a pair of Zaph ZRTs, including the crossovers. Things happened that have stopped me from thinking about finishing them till recently.

When taking a look at the crossovers that I had mostly finished building some years ago I noticed that the Jantzen audio CrossCaps that I have in the crossover have a dark orange/brown slightly sticky substance on their ends and that the ends of the caps faintly show that they are not completely flat, instead they look like they have slightly higher bubble shaped areas with lower areas in between (that the strange substance likes to fill).

At first I thought it was some flux from my bad soldering job, but it seems to also have happened on caps that I have not got around to soldering yet (thus also ruling out heat damage)!

Has anyone else had this happened to their caps and does it mean they are somehow damaged?
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Old 31st July 2014, 05:22 PM   #2
Bare is offline Bare  Canada
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Clearly something Substandard in there.
I have unused pedestrian Solens, date stamped from early 90s, that look and test No different than when bought.
Loose those... and don't buy more :-)
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Old 31st July 2014, 06:42 PM   #3
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Aren't cross caps polypropylene? Got a photo?
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Old 31st July 2014, 11:07 PM   #4
Thedaus is offline Thedaus  Australia
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Click the image to open in full size.
Click the image to open in full size.

Sorry about the really out of focus shots, but it should be visible.

Note that the first cap is fully soldered up and the second is soldered on the other side, I could not get a good shot of the unsoldered cap that is also showing the same signs though.

Edit:
The unsoldered one Click the image to open in full size. Click the image to open in full size.

Last edited by Thedaus; 31st July 2014 at 11:21 PM.
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Old 31st July 2014, 11:39 PM   #5
Thedaus is offline Thedaus  Australia
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If these caps are bad it puts me in a tough spot, it would cost $200 + shipping to the other side of the planet to get the predone madisound crossovers ($150 + shipping for just the caps alone).
The place I got the parts I have now are from a local place that still only sells Jantzen (and other semi local places sell caps for a lot more)
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Old 31st July 2014, 11:49 PM   #6
Jsixis is offline Jsixis  United States
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put a meter on them. What you are seeing could just be environmental dirt
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Old 31st July 2014, 11:58 PM   #7
Thedaus is offline Thedaus  Australia
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I don't have a meter (so that is an other $50) and if it was dirt would it not be on everything, not just the ends of the caps?
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Old 1st August 2014, 12:17 AM   #8
Jsixis is offline Jsixis  United States
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You can use a ohm meter, you'll see a brief moment continuity then it will drop to infinity

could have just been a sticky spots during production that over time change colors or picked something up. those are suppose to last a decade or two and with today's production failures are extremely rare.
Cat may have sneezed on them, spiders may have mated, I've seen smoke do that after some condensation, who knows, did you try wiping it off, damp rag?
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Old 1st August 2014, 12:29 AM   #9
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Probably spilled a can of coke on them or something. I'd be very surprised if it was coming from inside the cap.
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Old 1st August 2014, 01:06 AM   #10
Thedaus is offline Thedaus  Australia
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Quote:
Originally Posted by Jsixis View Post
You can use a ohm meter, you'll see a brief moment continuity then it will drop to infinity

could have just been a sticky spots during production that over time change colors or picked something up. those are suppose to last a decade or two and with today's production failures are extremely rare.
Cat may have sneezed on them, spiders may have mated, I've seen smoke do that after some condensation, who knows, did you try wiping it off, damp rag?
I did try to wipe them off, did not really do anything.
I could scratch a bit off with a fair amount of effort though.

Quote:
Originally Posted by fatmarley View Post
Probably spilled a can of coke on them or something. I'd be very surprised if it was coming from inside the cap.
Ha, I think I would remember that.
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