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Author Topic: Looking for a PSU cap for Crest 8001 amp  (Read 6804 times)

Tim McCulloch

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #30 on: February 15, 2018, 05:29:08 pm »


 ;D


One of my hardware engineers here at my day job said it was to strengthen the casing ;)

Bring 'er up slow, Greg.
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Bob Leonard

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #31 on: February 15, 2018, 09:52:21 pm »

Those caps should have been shipped with a wire across the leads. Discharge them before you handle them.
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Dave Laycock

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #32 on: April 26, 2018, 12:05:05 pm »


 ;D


One of my hardware engineers here at my day job said it was to strengthen the casing ;)

How did you get on with installing the new caps?

I've just had an 8001 go down and am looking into replacing the power caps as an option.
Which ones did you go for and do they fit/work as expected?
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Mac Kerr

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« Reply #33 on: April 26, 2018, 02:38:50 pm »

How did you get on

Please go to your profile and change the "Name" field to your real first and last name as required by the posting rules displayed in the header at the top of the section, and in the Site Rules and Suggestions in the Forum Announcements section, and on the registration page when you registered.

Mac
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Greg_Cameron

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #34 on: September 19, 2018, 11:46:20 pm »

How did you get on with installing the new caps?

I've just had an 8001 go down and am looking into replacing the power caps as an option.
Which ones did you go for and do they fit/work as expected?


Sorry I missed this. The new caps worked great - once the rectifiers were replaced. It's likely the failed rectifier is what caused the cap to blow.


Greg
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Dan Santoso

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #35 on: August 29, 2019, 11:58:01 am »


Sorry I missed this. The new caps worked great - once the rectifiers were replaced. It's likely the failed rectifier is what caused the cap to blow.


Greg

Hi Greg,

Can you tell me which caps did you buy? It will be great if you can give me link.

Thank you
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Mac Kerr

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« Reply #36 on: August 29, 2019, 12:10:05 pm »

Hi Greg,

Please go to your profile and change the "Name" field to your real first and last name as required by the posting rules displayed in the header at the top of the section, and in the Site Rules and Suggestions in the Forum Announcements section, and on the registration page when you registered.

Mac
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John Roberts {JR}

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #37 on: August 29, 2019, 12:42:19 pm »


Sorry I missed this. The new caps worked great - once the rectifiers were replaced. It's likely the failed rectifier is what caused the cap to blow.


Greg
Could be an either/or.... 

a shorted cap could stress a rectifier diode (that will melt and fail as a short)

or a shorted diode could overheat a cap and boil off the electrolyte... 

If both are bad could be a coin toss, but if the cap is not a short circuit, I suspect the diode failed first.

At this point it is academic.

JR
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Dan Santoso

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #38 on: August 29, 2019, 02:16:58 pm »

Can someone  help? The original caps was 35,000UF 75V. It is 2" in diameter.

I cant find the same caps, only 30.000uf cornell DCMC will fit.

https://www.mouser.co.id/ProductDetail/598-DCMC303U075BC2B

Is this a good one for replacement? It has less capacitance than the original.


Thanks
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John Roberts {JR}

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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #39 on: August 29, 2019, 02:32:21 pm »

Can someone  help? The original caps was 35,000UF 75V. It is 2" in diameter.

I cant find the same caps, only 30.000uf cornell DCMC will fit.

https://www.mouser.co.id/ProductDetail/598-DCMC303U075BC2B

Is this a good one for replacement? It has less capacitance than the original.


Thanks
30,000 uf @ 75V will work (if it fits)... there may be a slight difference in short term LF headroom (due to higher ripple voltage), but this is unlikely to be audible.

JR
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Re: Looking for a PSU cap for Crest 8001 amp
« Reply #39 on: August 29, 2019, 02:32:21 pm »


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