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Has anyone solved the 10000uf 120v Cap shortage?
Has anyone solved the 10000uf 120v Cap shortage?
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Old 13th March 2018, 07:47 AM   #1
AReinhart is offline AReinhart  United States
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Default Has anyone solved the 10000uf 120v Cap shortage?

Hello, Iím tearing an old NAD 2700 THX amp down to repair the common relay issue and while in there would like to replace the power supply caps. This issue has come up before within the various forums, including this one, however the end result is usually just reusing the old 120v caps. Well itís been a few years since the most recent posts and perhaps someone has come up with a workaround.

The issue is size. I believe the stock caps are 35mm. There are four in a tight bundle; 2ea 10000uf 120v first then 2ea 10000uf 80v leading out. Line voltage is around 118 and working voltage on the 120v is about 96v. Obviously a larger voltage cap on the initial side would work but the diameter is to big.

Has anyone followed through on this repair (NAD 2200,2600 and 2700 all share this I believe) or possibly found a vendor or work around?
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Old 19th March 2018, 06:08 PM   #2
AReinhart is offline AReinhart  United States
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Wow......guess not.
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Old 19th March 2018, 06:40 PM   #3
rayma is offline rayma  United States
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Quote:
Originally Posted by AReinhart View Post
Wow......guess not.
Electrolytic Capacitor 125V 10000uF 35x80mm can replace 120V 100V Audio | eBay
1PC Electrolytic Capacitor 125V 10000uF 35x80mm can replace 120V 100V Audio #J05 | eBay
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Old 19th March 2018, 06:44 PM   #4
AReinhart is offline AReinhart  United States
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I did see those. But no one has confirmed that they

A. Actually work.

B. Are better than whatís already in there.

Basically no one has followed through with their original posts. Not to mention, thatís the only place Iíve ever seen them. They are not available in any reputable shops that I have found.

Perhaps I need to be the trend setter here. These were popular amps, the entire series uses basically the same parts. So I canít be the only one but Iíll document what I do nonetheless.

Thanks for responding.
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Old 19th March 2018, 06:44 PM   #5
leadbelly is offline leadbelly  Canada
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Ah the famous cap shortage...was just watching on CNN this morning...

If it were me I would just rig up something ugly but functional with cheap surplus caps.

You can use ebay to find something: 1pcs HCG 160V 10000UF Electrolytic capacitor 35X70 105℃ #G2540 XH | eBay
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Old 19th March 2018, 06:48 PM   #6
rayma is offline rayma  United States
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Quote:
Originally Posted by AReinhart View Post
I did see those. But no one has confirmed.
Those are uncommon voltages for 10000uF, and may be all there is available
with pc mount pins that will fit in the space.

Maybe you could find screw terminal caps that will fit, and mount them
on a small adapter pcb. That style will be more expensive, though.

Last edited by rayma; 19th March 2018 at 06:57 PM.
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Old 20th March 2018, 03:25 PM   #7
AReinhart is offline AReinhart  United States
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Quote:
Originally Posted by rayma View Post
Those are uncommon voltages for 10000uF, and may be all there is available
with pc mount pins that will fit in the space.

Maybe you could find screw terminal caps that will fit, and mount them
on a small adapter pcb. That style will be more expensive, though.
Thatís a good idea. I hadnít considered it. Once the output relays are replaced these amps sound pretty good. But Iíve always eyeballed those four large power supply caps every time Iím in there. Eventually they will fail due to age and Iíve yet to find a suitable replacement that would be any type of ďupgradeĒ. I suppose those EBay caps, cheap or not, would replace a dried up cap in a pinch. Likely would get the amp working again.

The problem with the higher voltage caps is the diameter. The four that are in there are literally glued together they are so close. Iím currently working on another 2700 THX and while replacing most of the smaller caps and the troublesome relays, I figured Iíd try again to find a replacement or upgrade for the four large ps caps. I guess NAD was the only one to ever use these.
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Old 20th March 2018, 03:29 PM   #8
AReinhart is offline AReinhart  United States
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Quote:
Originally Posted by leadbelly View Post
Ah the famous cap shortage...was just watching on CNN this morning...

If it were me I would just rig up something ugly but functional with cheap surplus caps.

You can use ebay to find something: 1pcs HCG 160V 10000UF Electrolytic capacitor 35X70 105℃ #G2540 XH | eBay
Upgrade. While you could put a crate 195hp 350 in a ZO6 Corvette, would you?
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Old 20th March 2018, 04:34 PM   #9
rayma is offline rayma  United States
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Quote:
Originally Posted by AReinhart View Post
I figured I’d try again to find a replacement or upgrade for the four large ps caps.
I guess NAD was the only one to ever use these.
Those capacitors could have been custom made for NAD. If you repair these often, it would be
well worth it to make a custom pcb with readily available caps. You could even series connect
lower voltage caps.

Last edited by rayma; 20th March 2018 at 04:38 PM.
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Old 20th March 2018, 04:47 PM   #10
Samsara is offline Samsara  France
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Hello.

160V 35mm 5,4A at 120Hz for 105įC.
Search for ELXS161VSN332MA50S
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