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Old 21st December 2006, 08:43 AM   #1
impsick is offline impsick  United States
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Default opened up an old amp with glass caps(?)

i raped an old sansui( spelling ?) today and found a bunch of Elna caps which is cool cuz i needed the ratings it had inside.

but i came across some glass caps. low ratings mostly. small in size. whats the deal with these? any body familiar with glass caps?
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Old 21st December 2006, 09:03 AM   #2
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Pics?
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Old 22nd December 2006, 03:20 AM   #3
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ok ill put some pics up once i get home. im not 100% sure they're caps but on the pcb they are in the spots labled w/ a C####
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Old 22nd December 2006, 04:20 AM   #4
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Might be Polystyrene. Clear plastic body with silver foil inside. Stable, decent tolerances, prone to short IIRC.

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Old 22nd December 2006, 07:28 PM   #5
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yes bob those are them.
sorry havent made it home yet to put pics up but ill do that anyways cuz there were some big elna caps in there too.
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Old 22nd December 2006, 07:35 PM   #6
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Those caps are quite reliable, and very high performance. The reason you don't see more of them is that for a while no one was making them. I think there is at least one company that does now, but the others that stopped, stopped because there was no way to make them in chip form. The problem is that the dielectric melts at very low temperatures, so soldering them is tricky. With a leaded part you can clamp a heat sink on the lead being soldered to keep the heat from going up into the part and melting the dilectric. With chip caps there is no way to do it.

Keep those caps, and be careful with them when you solder them.

I_F
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Old 23rd December 2006, 12:49 AM   #7
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i forgot,

thanks alot for that info. very useful. i would have melted them all. haha. good looking out.
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Old 23rd December 2006, 04:42 AM   #8
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ok got some pics now...Click the image to open in full size.
these transistors are glass. whats the deal with these guys? Click the image to open in full size.
also inside was some other caps...
Click the image to open in full size.
Click the image to open in full size.
oh and check out these guys with the heat sinks on them. one has a diode on top of it
Click the image to open in full size.
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Old 23rd December 2006, 04:47 AM   #9
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I have come across "real" glass caps.

they look like the diode in the second pic but you can see an SMD chip capacitor inside it.
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Old 23rd December 2006, 04:58 AM   #10
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the first pic is a real glass cap. the reflection just made it look as though its not see through. and in the 2nd pic if you look to the left, thats a glass cap. a "real" one
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