How do you think about this amplifier? - 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 14th July 2013, 12:24 PM   #1
diyAudio Member
Join Date: Jul 2013
Default How do you think about this amplifier?

Namec 1000 watt
You can find it here,
but this is a closed group
Attached Images
File Type: jpg Namec.jpg (49.1 KB, 142 views)
File Type: jpg Namec 1000 watt.jpg (45.5 KB, 142 views)
File Type: jpg Namec BTL.jpg (58.8 KB, 228 views)

Last edited by shinoby; 14th July 2013 at 01:05 PM.
  Reply With Quote
Old 14th July 2013, 02:28 PM   #2
djoffe is offline djoffe  United States
diyAudio Member
Join Date: Oct 2008
I don't want to say anything bad about someone's design. But there are many potential problems in this design...not an exhaustive list by any means
1. 50 Volt caps on 65 volt rails
2.TR4 current source has no power supply rejection
3. no hi-freq input filter
4. really high closed loop gain of about 214
5. C3 R6 corner is only 15 Hz (causes LF distortion)
6. R9 and R10 kind of high to drive so many output transistors
7. output stage is probably under-biased
8. no hf bypassing on the rails.
9. 2.2 mA in TR4 probably not enough to drive the kind of output currents you seek
10. Input biasing guarantees unbalanced first stage.
11. output power statements kind of optimistic

That's enough for now...although the phase inverter could probably use a lot of work also.
  Reply With Quote
Old 14th July 2013, 06:12 PM   #3
diyAudio Member
Join Date: Nov 2009
Location: Los Angeles
How about TIP41C and TIP42C are only 100V devices (Fairchild data sheet) and you're running 130 Volts.

  Reply With Quote
Old 14th July 2013, 07:36 PM   #4
ilimzn is offline ilimzn  Croatia
diyAudio Member
Join Date: Feb 2005
Location: Zagreb
Looks like one more wishful thinking designs. Often these actually make it into production in China and are then sold around the world...
  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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Motional feedback amplifier based on Philips 40 wats amplifier 1970s sanbadgujar Solid State 14 13th October 2013 01:35 PM
converting PA amplifier into symetrical class A son of Zen amplifier muddasirwaheedmalik Pass Labs 5 16th October 2012 04:01 PM
An amplifier to take to University - A small low power integrated amplifier monty78pig Solid State 33 31st August 2012 06:00 AM
Wanted: DIY amplifier builder with experience. I need a 0.7 ohm stable amplifier Audiophilenoob Swap Meet 34 16th May 2005 11:58 PM
Questions about how to decrease the PASS A-40 amplifier into a class AB amplifier. novtango Pass Labs 2 21st October 2002 01:50 AM

New To Site? Need Help?

All times are GMT. The time now is 04:47 AM.

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