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In Reply to: RE: Is there an electrolytic capacitor shortage? posted by jorisdallaire on October 03, 2021 at 16:20:13
I was wrong and you are correct about the 85 c temp. I think you found the same ones I mistakingly looked at.
I'm not having any luck finding anything reasonably close, even looking at new old stock.
If you don't come across anything suitable, perhaps you can post the name of the component you are working on? Someone may have been in a similar situation and came up with a solution. (I think Bang & Olafson used Eurocaps?)
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Follow Ups:
The amp is an 1990 Rega Elicit. I like its sound and it has a very nice MM/MC phono stage.
The caps are next to an heatsink that has a 80°C cut-off switch attached. It works (Trust me I know ;-) so the caps shouldn't be submitted to more than that. I measured the case temperature with an infrared thermometer and it is stable at around 50°C on my usual listening level. So perhaps a 85°C rated capacitor would do - However as it would operate close to its maximum rating, I fear their life expectancy would be reduced. I don't want to change caps every two years, and a cap failure might wreck havoc with the circuitry.
OTOH, the original caps are spec'd at 50V, so a 63V part would be voltage de-rated, which increases the temperature safety margin. The reason why I want to go with a higher voltage rating is that the schematics say that 48V is present on the filter cell. That is too close to 50V for my taste, especially since the mains here is specified as 120V -10%/+15%. That means these caps are subject to short periods of over voltage - That may be why they are failing.
Sorry for the long post, I'm thinking out loud :-)
-J
Your a tough man to please. Perhaps the below might be worth a try. Someone was saying good things about a different value of the same series. They are being billed as audio grad"The absolute very BEST electrolytic capacitors are made by Vishay BC components. They were used to be made by Philips. They are aluminum electrolytic caps. They are covered in a blue plastic film and have axial leads. You can buy them at www.newark.com Again, the very best electrolytic caps I've ever used. In solid state amplifiers, power supply bypassing is a must! To protect against oscillation, etc. For example, if it's a mosfet output stage amplifier, the bypass caps need to be located as close to the mosfets as possible. I usually do it like this: 4700uF(electrolytic) + 47uF(electrolytic) + 1uF(film) + 0.1uF(film) This works for me! But it will vary from case to case.
Paul Hilgeman -"
Denied facts are still facts.
Edits: 10/04/21
Your a tough man to please
So my wife keeps telling me lol
I know Vishay components are good, I'm going with these. Probably better than the JCCON I saw everywhere.
Your help was greatly appreciated!
Joris
Very nice Rega!
Not sure if this will help but I found a link on another forum regarding your unit.
There are several pages and as you read through the capacitor values are mentioned. Later on it states the values on the schematic are incorrect. Oddly the values again change. I guess what I'm wondering is if you actually had a chance to read the values on the caps. Perhaps they might be easier to find.
Also a great bunch of people over there that may be able to help.
Jonesy
"I know just enough to get into trouble. But not enough to get out of it."
Thanks again for The link Jonesy! I'm reading the thread right now.
Yes, all values were read on the actual parts, and dimensions measured on them with a caliper.
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