Nad T 750 - 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
Thread Tools Search this Thread
Old 27th December 2003, 08:10 PM   #1
diyAudio Member
Join Date: Dec 2003
Location: Munich
Default Nad T 750

Hello Everybody!
I am new in this forum. In fact I stopped my "do it yourself" projects for about 10 years. But well, passion never dies
Some days ago I bought a Receiver from NAD through e-bay. Don't ask why, but I needed it urgently, because...

It showed some issues with connectors inside, just the normal drawbacks (left chanel missing...).

The amplifiers all had nearly no quiescient current, but offered a good margin in thermal handling and a very good thermal compensation!
I decided to adjust the bias of the front amplifiers 4 times higher than original and found an impressive improvement in sound (no wonder..).
Up to now this modification did not show any disadvantages.

Besides this it had some ringing of the rear amplifiers when cold... right after turning it on for about 1 minute.
You could hear this ringing through all amplifiers, also in the stable ones...
This also showed some dependencies on internal connectors, but also from the connected load etc...
The rear amplifiers do not have adjustable resistors for the current bias of the output stage. But simply putting a 1k/5W resistor from each output to positive or negative rail (no matter) stabilized this ringing immediately.....
(May be I will find some time to set up a more reasonable correction of this issue.)

To be honest: This receiver seems to give a lot of opportunities to improve it!
But without detailed schematic I feel somehow "blind".
It would be really great if somebody has the service manual or knows where to get it or any other detailed information of the construction.

  Reply With Quote
Old 28th December 2003, 06:17 AM   #2
pieris is offline pieris  United States
diyAudio Member
Join Date: Dec 2003
Location: California
I got schematics for my NAD CD player by purchasing them from the NAD service manual dealer. This number worked last year: 1-800-263-4641. Tell them what you want, they should send you a CD for about $30.
  Reply With Quote
Old 30th December 2003, 04:43 AM   #3
diyAudio Member
Join Date: Dec 2003
Location: Munich
Thanks for your hint. I will try this if no local service center in Munich will provide the manual.
  Reply With Quote


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

New To Site? Need Help?

All times are GMT. The time now is 10:50 PM.

vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999-2017 diyAudio

Content Relevant URLs by vBSEO 3.3.2