Badcaps.net Forum
Go Back   Badcaps Forums > Electronics Theory and Troubleshooting > Audio Equipment Discussion
Register FAQ Calendar Search Today's Posts Mark Forums Read

 
Thread Tools Display Modes
Old 11-17-2017, 07:59 PM   #1
AsRock
New Member
 
AsRock's Avatar
 
Join Date: Mar 2016
City & State: PA
My Country: US
I'm a: Knowledge Seeker
Posts: 9
Question NAD T753 revisit

Hello all, i got a NAD T753 some time ago and got it up and running though a lot of time and effort.

Well once i got it working i did a few changes and was thinking of improving them ( pictures be added at the end ). And was thinking of just swapping out all the capacitors on the main board, i have the service manual for the actual version which is pretty detailed and i have found specs for the caps to replace.

Reason i am planning to replace them with new is that before i made the changes most were put under a lot of heat which must of done them any good what so ever.

Anyways just trying to confirm that audio capacitors are not required or even should not be used even if the specs are about the same ?.

Pictures are hosted from another site and is ok with the owner of the site, hopefully it's a none issue.

Before the changes the diodes are cramped up against a heat sink and cap, i was seeing some horrid temps around this are and no wounder they were failing all the time, i all so got some high quility diodes which have not been added as i had to wait 3 months for them and got some others that can cope with 150c.













All so added a heatsink on the underside too


Attached Images
File Type: jpg igp8158.jpg (353.5 KB, 21 views)
File Type: jpg igp8209.jpg (1.22 MB, 22 views)
File Type: jpg igp8241.jpg (538.0 KB, 21 views)
File Type: jpg igp8227.jpg (574.8 KB, 22 views)
File Type: jpg igp8213.jpg (716.7 KB, 22 views)
File Type: jpg igp8244.jpg (521.7 KB, 20 views)
File Type: jpg igp8225.jpg (927.7 KB, 21 views)
File Type: jpg igp8252.jpg (818.4 KB, 21 views)
AsRock is offline   Reply With Quote
Old 11-18-2017, 03:24 PM   #2
AsRock
New Member
 
AsRock's Avatar
 
Join Date: Mar 2016
City & State: PA
My Country: US
I'm a: Knowledge Seeker
Posts: 9
Default Re: NAD T753 revisit

Well i will try to be clearer what i am trying to find out.

For example one of the capacitors in question is a Samxon KM series 35v 20% 105c, this cap is on the main\ power board for the unit. Which has a ripple current of 1808.

Was thinking of replacing it with this https://www.digikey.com/products/en?...ds=UKA1V332MHD

Would this be ok ?,
AsRock is offline   Reply With Quote
Old 11-21-2017, 01:28 PM   #3
Per Hansson
Super Moderator
 
Per Hansson's Avatar
 
Join Date: Jul 2005
City & State: ----
My Country: Sweden
Line Voltage: 230v 50Hz
I'm a: Knowledge Seeker
Posts: 3,838
Default Re: NAD T753 revisit

Samxon KM is just a general purpose cap, you don't need to replace it with anything very special.
Audio grade caps are mostly snake oil, they *might* have some use in the audio signal path.
But otherwise they make no difference what so ever.
If I want to be picky the Samxon KM is rated for 1.8A ripple current at 120Hz, whereas that one you linked is only rated for 1.6A at 120Hz.
In reality that will make no difference at all though
__________________
"The one who says it cannot be done should never interrupt the one who is doing it."
Per Hansson is offline   Reply With Quote
Old 11-21-2017, 03:18 PM   #4
Topcat
The Boss Stooge
 
Topcat's Avatar
 
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 11,041
Default Re: NAD T753 revisit

I also attached the images.....
__________________
<--- Badcaps.net Founder & Owner

Badcaps.net Services:

Premade Capacitor Kits
Badcaps.net Capacitor Master List


Motherboard Repair Services


If you've come here in search of replacement capacitors or repair services, please use the links above.
----------------------------------------------
Badcaps.net Forum Members Folding Team
http://folding.stanford.edu/
Team : 49813
Join in!!
Team Stats
Topcat is offline   Reply With Quote
Old 11-21-2017, 04:04 PM   #5
AsRock
New Member
 
AsRock's Avatar
 
Join Date: Mar 2016
City & State: PA
My Country: US
I'm a: Knowledge Seeker
Posts: 9
Default Re: NAD T753 revisit

Quote:
Originally Posted by Per Hansson View Post
Samxon KM is just a general purpose cap, you don't need to replace it with anything very special.
Audio grade caps are mostly snake oil, they *might* have some use in the audio signal path.
But otherwise they make no difference what so ever.
If I want to be picky the Samxon KM is rated for 1.8A ripple current at 120Hz, whereas that one you linked is only rated for 1.6A at 120Hz.
In reality that will make no difference at all though
Well that was the idea and just replace, i have actually ordered all the caps to be replaced close as possible to the originals as possible.

Personally i think the Samzon caps are really good with near rated uf and 0.02 Ohm esr readings. But when this unit was repaired i was seeing 75c temps which is why i flipped the transistors. which has improved the area temps of around 44c. But i do not know how long those caps have been under that heat so was just thinking better safe than sorry.

What failed originally was 2 diodes and 2 caps, and did manage to get rid of most of that crappy glue they used back then.

Thanks.



Quote:
Originally Posted by Topcat View Post
I also attached the images.....
Thanks, maybe i should of put them in a spoiler.
AsRock is offline   Reply With Quote
Old 11-21-2017, 09:38 PM   #6
Topcat
The Boss Stooge
 
Topcat's Avatar
 
Join Date: Oct 2003
City & State: Salem, MO
My Country: United States
Line Voltage: 120VAC 60Hz
I'm a: Professional Tech
Posts: 11,041
Default Re: NAD T753 revisit

Quote:
Originally Posted by AsRock View Post
Thanks, maybe i should of put them in a spoiler.
It just guarantees that folks in the future that might read this thread won't see a bunch of broken image links.....
Topcat is offline   Reply With Quote
Old 11-22-2017, 12:39 PM   #7
Per Hansson
Super Moderator
 
Per Hansson's Avatar
 
Join Date: Jul 2005
City & State: ----
My Country: Sweden
Line Voltage: 230v 50Hz
I'm a: Knowledge Seeker
Posts: 3,838
Default Re: NAD T753 revisit

Quote:
Originally Posted by Topcat View Post
It just guarantees that folks in the future that might read this thread won't see a bunch of broken image links.....
It also gives the green padlock as the links now don't go to a non HTTPS website
Per Hansson is offline   Reply With Quote
Old 11-22-2017, 03:06 PM   #8
AsRock
New Member
 
AsRock's Avatar
 
Join Date: Mar 2016
City & State: PA
My Country: US
I'm a: Knowledge Seeker
Posts: 9
Default Re: NAD T753 revisit

Quote:
Originally Posted by Topcat View Post
It just guarantees that folks in the future that might read this thread won't see a bunch of broken image links.....
Cool, although the host i have never had lost pictures over many years now, but you never know right!.

Better be safe than sorry, as it's very annoying when your looking for some thing and the picture is either missing or hosted on data limited site.

should have my caps on Saturday.

Noticed another thread on a T753 on here it's a shame as i missed that as i actually had the parts he was after.

Last edited by AsRock; 11-22-2017 at 03:10 PM..
AsRock is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump



Badcaps.net Technical Forums 2003 - 2017
Powered by vBulletin ®
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
All times are GMT -6. The time now is 03:19 AM.

Did you find this forum helpful?