Newbie with a Nad 214 - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Solid State Talk all about solid state amplification.

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 13th March 2016, 10:45 AM   #1
Mag1977 is offline Mag1977  United Kingdom
diyAudio Member
 
Join Date: Mar 2016
Location: Norfolk
Default Newbie with a Nad 214

Hi everyone, I've just got myself a Nad 214 which I'd like to replace the main caps and the speaker relay. As this is the first time I've done something like this I'd like a bit of advice please, can anyone suggest suitable caps I could use, I'm not sure which manufactures to look out for or even the best place to buy them? these have been suggested on another thread UVY1J472MRD Nichicon | Mouser as I've never brought caps before I'm unsure if they're any good.
Also this relay has been suggested as a suitable replacement G2R-2 48DC | DPDT PCB Mount Non-Latching Relay Through Hole, 48V dc | Omron again does anyone know if this is ok?
Thanks in advance for any help
  Reply With Quote
Old 13th March 2016, 12:03 PM   #2
diyAudio Member
 
JonSnell Electronic's Avatar
 
Join Date: Dec 2012
Location: The Jurassic Coast, England. GB
Send a message via Skype™ to JonSnell Electronic
Measure the physical size and look up a suitable replacement for the main smoothing capacitors. Aluminium Capacitors | RS Components
I think you will find the capacitors are Snap In type. Check before you buy!
On this site you can find relays as well, at a proper price!
Question, is the amplifier faulty? If not, why replace things? I have never has a faulty relay that NAD have used and the main smoothing capacitors are very reliable. I have been repairing NAD from pre 1984 and under NAD warranty.
__________________
Support for Flying Mole Class D, PMC DS-001 (Hypex),Valve Equipment and designs both new and old. www.jonsnell.co.uk
  Reply With Quote
Old 13th March 2016, 01:37 PM   #3
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Brands aren't the issue - the main improvement in recapping is simply fitting fresh caps of good industry standard quality. It's an expensive operation, so being able to afford any exotics you may have a leaning toward, could be a bigger issue.
For the large reservoir caps, go for highest ripple current rating at a reasonable price from Panasonic, Nichicon, Elna, Rubycon, Nippon Chemicon or any competitive grade cap with a good rap and brand profile. For the smaller electrolytics, you are looking at Low ESR types but not the lowest ESR. Panasonic FC is a popular, long standing favorite for general purpose use in decoupling and small power supplies where the values are covered by the available range. Naturally, all those manufacturers will have suitable equivalent grades and there are plenty of strong opinions as to which is best. But often, they are really just chosen by the sentimental ring of the brand name - like cars.

Whatever, never Buy caps on Ebay unless the seller is known to you. Even if the product is genuine, old stock is deteriorated stock and that's what you could be wasting money and time over, when you find your replacements just don't seem worthwhile.

This only applies to electrolytic caps, the other film and ceramic types will not deteriorate in normal use and you can leave them alone unless you decide at some to experiment for the hell of it. Just make sure you have read about the issues surrounding the particular caps you want to change - some are critical types and the amp. won't take kindly to messing with frequency compensation caps for example.

Do you really need to replace the relay? (Free manual download here: NAD 214 Manual - Stereo Power Amplifier - HiFi Engine)

You appear to have found an equivalent to the unusual 48V DEC relay, but the issue can only be dirty contacts and this is easily dealt with as long as the cover can be prised off with a suitable small hooked tool like a tiny screwdriver bent at 90 degrees for 5-8 mm at the blade or a short length of stiff steel wire similarly treated.

Then, a few simple wipes with small strips of stiff card squeezed lightly between the contacts, will do the trick. Wet the card with contact cleaner, rubbing alcohol or IPA to lubricate the process and leave clean, untouched surfaces. Just spraying contacts though, is a waste of time.

You will have to see this guy to get the gist of relay cleaning and the results if you aren't used to tinkering with stuff - at least you get a laugh. https://www.youtube.com/watch?v=naEajoxaUu0
__________________
Ian

Last edited by Ian Finch; 13th March 2016 at 01:46 PM.
  Reply With Quote
Old 13th March 2016, 04:02 PM   #4
Mag1977 is offline Mag1977  United Kingdom
diyAudio Member
 
Join Date: Mar 2016
Location: Norfolk
Thank you both for your very helpful replies.
To be honest the amp isn't faulty however to my ears it does seem a little weak in the bass department when pushing on a bit! I've been reading up on this amp and going by this article https://fittingmedia.wordpress.com/2...refurbishment/ I wondered due to the age of the amp if the main psu caps had dried up and gone weak? The article also mentions utilising the 2 spare connections on the board to fit 2 more caps making a total of 6.
As for the relay again going from that article I was just going to replace it while I was in there as they are not a lot of money!
Obviously I'm new to amplifier repairs so I do appreciate the help given!
  Reply With Quote
Old 13th March 2016, 07:06 PM   #5
Mag1977 is offline Mag1977  United Kingdom
diyAudio Member
 
Join Date: Mar 2016
Location: Norfolk
Thinking of going for the 105degree Panasonic caps from the RS link given above, how would I tell if the capacitors are the snap in type?
Thanks for your help
  Reply With Quote
Old 13th March 2016, 08:08 PM   #6
ammel68 is offline ammel68  United States
diyAudio Member
 
Join Date: Sep 2009
Location: Southeast, U.S.
Quote:
Originally Posted by Mag1977 View Post
Thinking of going for the 105degree Panasonic caps from the RS link given above, how would I tell if the capacitors are the snap in type?
Thanks for your help
Look at the first photo on this site and you'll see both types:
Capacitors | Tubelab

The snap-in type have the heavier, bent leads that look like they are retained by some type of rivet on the bottom of the cap.
  Reply With Quote
Old 13th March 2016, 08:35 PM   #7
Mag1977 is offline Mag1977  United Kingdom
diyAudio Member
 
Join Date: Mar 2016
Location: Norfolk
Great thanks, is it possible to tell which type is fitted while they're still soldered to the board or would they need to be removed first?
  Reply With Quote
Old 14th March 2016, 01:51 AM   #8
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
Look at the bottom of the board where the pins protrude under the solder.
2 features: Snap-ins are always 10mm between hole centres and the legs are of thick, rectangular cross-section because they are punched from sheet metal. Wire legs are well...round wire and probably different centre spacing - just as you see in Ammel68's post.

A check from the service manual I posted earlier shows there are 4700 uF caps with space for 4. Obviously, you could fit 2 or 4 x 10,000uF which is something I would certainly do for an 80W amp also rated higher for 4R loads because only 10,000uF/rail is penny-pinching and if there are only 2 caps fitted, this will show up in performance in later years, as you may be experiencing. Check the height will fit with larger values as advised earlier but I don't think there will be issues as modern caps are generally much smaller.

Few manufacturers anywhere are as tight-a**ed as NAD and many issues with their amplifiers are about just-bearable quality parts or simply not enough of them. Note on values of capacitance - these are very nominal because of wide tolerance on the value, so saying 2 x 4700uF = 9400uF is unrealistic with tolerances as high as electrolytic values have. 2x 4700 = 10,000 uF is conventional.
__________________
Ian

Last edited by Ian Finch; 14th March 2016 at 02:19 AM.
  Reply With Quote
Old 14th March 2016, 11:39 AM   #9
Mag1977 is offline Mag1977  United Kingdom
diyAudio Member
 
Join Date: Mar 2016
Location: Norfolk
Thanks again for a very informative reply, I'll flip the board over later and check which type are fitted.
Looking at the board there are 4caps fitted with space for 2 more, do you think I should therefore fit 6 x 10,000 caps in place of the 4x4700?
Thanks again
image.jpg
  Reply With Quote
Old 14th March 2016, 12:04 PM   #10
diyAudio Member
 
Join Date: Apr 2010
Location: Coffs Harbour
You are quite right and I should have looked more carefully at the parts lists and your pics.
6 caps and I expect that the extra pair suits NAD 216. Note that you already have the empty
holes for the extra caps to check for pin spacing, no? If the holes are the right spacing you
dont need to faff about with disassembly just yet. Just order snap-ins and wait.

Looking at the slim diameter of those caps and the tight packing though, I would consider the
diameter of your replacements a first priority. Buying stuff that won't fit isn't a lot of fun.
Anyway, 6 x 4700 or 4 x 10,000 is plenty already, IMHO. Enough is as good as a feast...
__________________
Ian

Last edited by Ian Finch; 14th March 2016 at 12:31 PM.
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Nad 214 Vrystaat Solid State 11 27th February 2015 05:52 PM
Modifying the NAD 214 altair Solid State 6 25th February 2015 05:31 PM
Wanted NAD 214 cmitch Swap Meet 0 8th March 2013 11:56 PM
nad 214 where are the fuses? gregkitchen Solid State 1 19th August 2006 12:35 AM


New To Site? Need Help?

All times are GMT. The time now is 02:24 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki