Need some help with Thiel CS3.5 crossovers - Page 2 - diyAudio
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Old 26th February 2013, 09:49 PM   #11
Einric is offline Einric  United States
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Default Capacitor Tolerance Codes

Here is a pretty good Tolerance Code list.
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File Type: jpg Capacitor tolerance codes.jpg (36.3 KB, 42 views)

Last edited by Einric; 26th February 2013 at 09:53 PM. Reason: Data Update
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Old 26th February 2013, 09:54 PM   #12
Einric is offline Einric  United States
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The Clear stuff might be a special "High Temp" hot glue.
The higher the temp melt generally the stiffer and stronger the bond.
Put a hair dryer on it for a few minutes and see if it gets soft and sticky.
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Old 26th February 2013, 09:55 PM   #13
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Quote:
Originally Posted by chunkster View Post
Dread - the black adhesive used to glue down the caps and resistors does look like E6000. I'm wondering what the clear adhesive used to glue down the coils and the hook up wire is. It looks almost like hot glue, but is much stronger. May be a thick epoxy of some kind.
I believe you are correct, it is clear hot melt glue and tie wraps.
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Old 26th February 2013, 10:37 PM   #14
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Guys I really appreciate all the help! I'm learning a lot as I go and I hope I'm not boring you old hands. Since the only option on getting my midrange repaired appears to be sending it to Thiel (at $300 for the rebuild) and I'm not made of money (please no jokes about cavier tastes on a vienna sausages budget ), I'm trying to come up with the most affordable way to get my crossovers back in action. Both crossovers have the same cap blown (see attached photo), which is a 1uF 5% polypropylene. What would be the downside or sides to replacing just the 2 blown caps? I can't find a source for the Versa-Tronics caps anywhere (though they do appear to still be in business) Would replacing all the 1uF caps be a better idea? The reason I ask is that the 100uF caps (4 per crossover) appear to be pretty pricey.

Second questions, what does the exact some cap being blown on both crossover tell me? I found that very interesting.

Side note, I the only source I've found for the 15pF polystyrene caps is at justradios.com

Thanks Again!
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Old 27th February 2013, 01:06 AM   #15
Einric is offline Einric  United States
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I would purchase some 100uf Non-Polar Electrolytics from Madisound or Parts-Express and some 1uF Solen Poly Caps.
Any more than that and you are going to really be changing the crossover alot for something that is probably well tuned.
The Non-Polar next to the popped Poly cap is a 66uF, you will have to parallel 2 33uF NPE's to get that value.

Those Polystyrene caps are probably still just fine.
I'm just really surprised that the Solen Poly Cap popped and the electrolytic didn't.

Last edited by Einric; 27th February 2013 at 01:09 AM.
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Old 27th February 2013, 03:36 AM   #16
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Originally Posted by chunkster View Post
Side note, I the only source I've found for the 15pF polystyrene caps is at justradios.com

Thanks Again!
As someone had already pointed to you, those caps are 15nF and not 15pF...
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Old 27th February 2013, 02:28 PM   #17
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Tube_Dude - I'm confused about those caps. The gentleman at Thiel told me they were 15pF I even wrote it down. And from looking up the capacitor codes from Wikipedia for small value caps 15000H would translate to 15pF + 0 extra digits with H tolerance. So that would seem to support what the Thiel rep told me. Am I being dense?
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Old 27th February 2013, 09:49 PM   #18
Einric is offline Einric  United States
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It is very possible that You are correct Chunk.
I'm not terribly good with small value identification.
If Thiel told you they are 15pf then I would stick with that.

To be honest you may even be able to leave them out.

But....Like I said the polystyrene capacitors are sealed and if they are not leaking I would say they are just fine.
Some modern polystyrene capacitors have 100k+ hour service life at rated voltage.
I seriously doubt that you have exceeded the rated voltage of those caps in a crossover or you have exceeded their service life.
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Old 28th February 2013, 03:21 PM   #19
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I've got all the parts headed to my door. I couldn't have done it without all of your help. When I get everything back together I'll let you all know how it turned out. Thanks again!
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Old 28th February 2013, 09:18 PM   #20
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The midrange does occasionally come up on ebay and you can also post a wanted to buy on audiogon, both have worked for me. Keep in mind the midrange is problematic and 2 of the 3 I purchased have been in less than stellar condition, one actually totally seized and sold as "perfect"... Anyway, the rebuild kits are no longer being made and a "new" condition midrange (as would be from Thiel) would be extremely valuable. $300 is way too much, these speakers are selling for between $500-$800 a pair, and that is the entire speaker. I was quoted a price of $250 for the mid from them years ago, price is not going down.

Just recap the crossovers with new electrolytics and films (1ufs) and make a call as to whether to reuse the polystyrene, based on some searches, it appears these are actually very robust and probably could survive anything coming at them from the amp.

The 100 uf caps at madisound are only $2.40.

Last edited by DreadPirate; 28th February 2013 at 09:25 PM.
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