Go Back   Home > Forums > >

Solid State Talk all about solid state amplification.

NAD 3150
NAD 3150
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
Old 27th September 2021, 03:05 PM   #41
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
mmm i will,eventualy, trouble is i have 17 nads yet to fix
  Reply With Quote
Old 27th September 2021, 03:12 PM   #42
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
Quote:
Originally Posted by Mooly View Post
The lamp will glow when you have bias current flowing. So not a problem.

Just remember to make sure the adjustment is still correct when on full mains as it can change with the higher supply voltage.

The centre pin of the resistor pack will go to the speaker output and so measuring from speaker + to that centre pin would always show as 0 volt. If the manual says to do it that way then it is wrong. You have to measure across one of the resistors which you seem to be doing.

8mv will about 36 milliamps current

A buzz a loud buzz, a quiet buzz. It needs quantifying and checking. Does it change with the volume control for example.

oh by the way the buzz dissapeared with those 10 loose joints
  Reply With Quote
Old 27th September 2021, 03:14 PM   #43
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
Quote:
Originally Posted by wg_ski View Post
If the resistor is in series with a relay coil, sitting there running hot day in and day out, it could turn brown into violet easily. Discoloration is a sign of long term (over)heating. And if it does read 490 ohms that pretty much confirms that itís running too hot - values tend to go *up*. Probably using 1/2 watt carbon film when they really needed 2 watt MOX or WW for long term stability.

it was def a 2w carbon installed
  Reply With Quote
Old 27th September 2021, 03:35 PM   #44
wg_ski is offline wg_ski  United States
diyAudio Member
 
Join Date: Oct 2007
Carbon comp? Long term stability = crap. Par for the course.

Quote:
Originally Posted by poundy View Post
mmm i will,eventualy, trouble is i have 17 nads yet to fix
Youíre going to be busy for the rest of your natural life.
  Reply With Quote
Old 27th September 2021, 03:50 PM   #45
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
ive already been busy for the first bit
  Reply With Quote
Old 27th September 2021, 04:05 PM   #46
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
Quote:
Originally Posted by wg_ski View Post
Carbon comp? Long term stability = crap. Par for the course.



Youíre going to be busy for the rest of your natural life.

sorry yes composite
  Reply With Quote
Old 27th September 2021, 05:54 PM   #47
Mooly is offline Mooly  United Kingdom
diyAudio Moderator
 
Mooly's Avatar
 
Join Date: Sep 2007
NAD 3150
Quote:
Originally Posted by poundy View Post
mmm i will,eventualy, trouble is i have 17 nads yet to fix
So that is why the price has increased, shortage of supply 'cos someone is buying them all up

Quote:
Originally Posted by poundy View Post
oh by the way the buzz dissapeared with those 10 loose joints
Well that's good

Quote:
Originally Posted by poundy View Post
sorry yes composite
Composite as in carbon composition... NAD use those things? Carbon film is fine but not the other. That's very 1960's.

Carbon composition, you could keep it original:
Attached Images
File Type: jpg Screenshot 2021-09-27 175328.jpg (61.3 KB, 40 views)
  Reply With Quote
Old 28th September 2021, 03:12 PM   #48
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
no they don't look like that ,not the 2-4w ones anyway.
they are all one colour, blue mainly and have the resistance written on them

they are quite crumbly if you pick at them
  Reply With Quote
Old 28th September 2021, 04:07 PM   #49
wg_ski is offline wg_ski  United States
diyAudio Member
 
Join Date: Oct 2007
Those all blue ones are metal oxide. If they are “crumbly” then they are of poor quality. Even the cheap Yageo ones I use hold together quite well - even when overloaded.
  Reply With Quote
Old 28th September 2021, 05:07 PM   #50
poundy is offline poundy  United Kingdom
diyAudio Member
 
poundy's Avatar
 
Join Date: Feb 2021
Location: near that big airport in the south
NAD 3150
your quite right they are
funny one service manual says metal film the other metal oxide
  Reply With Quote

Reply


NAD 3150Hide this!Advertise here!
Thread Tools

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Volume/balance pot for NAD 3150 amp johngalt47 Swap Meet 1 23rd August 2016 02:54 PM
NAD 2150/3150 Schematic + advice steve_aus Solid State 1 22nd November 2011 07:15 PM
NAD 3150 Amp Channel Dropout eyendall Solid State 5 18th November 2007 12:16 AM
Schematic/Service Manual NAD 3150 corrieb Solid State 2 6th February 2007 02:36 AM


New To Site? Need Help?

All times are GMT. The time now is 04:38 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 13.64%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2021 DragonByte Technologies Ltd.
Copyright ©1999-2021 diyAudio
Wiki