NAD C 300 AMP + Smoke = :( - diyAudio
Go Back   Home > Forums > Amplifiers > Solid State

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 12th May 2010, 02:00 PM   #1
diyAudio Member
 
Join Date: May 2010
Default NAD C 300 AMP + Smoke = :(

Hello all, first up I have to say I know very little about audio equipment so please go easy on me!

I have recently been given an amp (NAD C 300) and some (what I'm told are) nice speakers, that had both been working but kept in a loft for maybe 4 years. The plan was to run the audio from my computer through the amp.

I connected the computer (Intel 2 Core Duo iMac) to the AUX input of the amp from its "Headphone Out" socket. I was careful to turn the volume right down on the computer before slowly going to about 50%. All worked great and sounded superb for about 30mins. I turned the volume down on the amp walked away, came back about an hour later and the amp seemed to have turned itself off. On trying the power button the LED next to the power button flashed red but then died. I tried once more and a whisp of smoke came from the amp and died completely, no LED.

So my questions are. Is this my fault? Someone now tells me that I should only use a lineout to connect to the amp as the headphone output will be too strong? I don't think my Mac has a lineout however? What should I have done?

Also is there anything I can do to diagnose the problem? I'd preferably like to have some kind of idea before I take it to repair. Are these things cheap to repair and is it even worth it?

Any help would be much appreciated, sorry for all the novice questions!..
Click the image to open in full size.
  Reply With Quote
Old 12th May 2010, 08:23 PM   #2
jaycee is offline jaycee  United Kingdom
diyAudio Member
 
Join Date: Apr 2004
Location: Norwich, UK
Well you hooked it up OK. I have an iMac and it's output port can sense the difference between a line out connection and a pair of headphones.

My guess is, if it's been in a loft that long, its gotten dirt, dust and perhaps moisture in it, and that has killed the amp. Seen that before.

On an amp that old a repair shop will probably say "not worth it mate". Don't take it to a TV repair guy - they will make a royal mess of it!

It doesn't say where you are in the world, but if you were in Norwich, UK i would have been happy to take a look at it for you.
  Reply With Quote
Old 12th May 2010, 10:29 PM   #3
diyAudio Member
 
Join Date: May 2010
Quote:
Originally Posted by jaycee View Post
Well you hooked it up OK. I have an iMac and it's output port can sense the difference between a line out connection and a pair of headphones.

My guess is, if it's been in a loft that long, its gotten dirt, dust and perhaps moisture in it, and that has killed the amp. Seen that before.

On an amp that old a repair shop will probably say "not worth it mate". Don't take it to a TV repair guy - they will make a royal mess of it!

It doesn't say where you are in the world, but if you were in Norwich, UK i would have been happy to take a look at it for you.
Ironically I just picked them up from Norwich and have taken them home to where I live in York, though thank you for the offer! I would definitely like to avoid the "not worth it mate, get a new one" attitude since it was generously given to me and I wouldn't feel right to just throw it away. I'm not sure I will be back in Norwich for a few months however so I think I will have to find someone up here..

I opened the amp up and can clearly see a black burn mark around a capacitor (marked "c 718").

http://dl.dropbox.com/u/3454522/NAD1.jpg
http://dl.dropbox.com/u/3454522/NAD2.jpg
  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
ZAPpulse and S&B TX102 = smoke, help! Tenson Class D 32 7th March 2007 10:55 PM
T-amp up in smoke jwb009 Class D 21 4th April 2006 07:50 AM
NAD S 300 Schematics or Service Manual DFroehlich Solid State 0 7th March 2006 10:01 AM
trio amp up in smoke-ya really up karma Tubes / Valves 11 5th July 2004 11:28 AM


New To Site? Need Help?

All times are GMT. The time now is 08:58 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2