amplifier clipping early - 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 March 2010, 04:21 PM   #1
gruni is offline gruni  Germany
diyAudio Member
Join Date: Feb 2008
Default amplifier clipping early

hello everybody!
i just got another defective amplifier to repair. it starts clipping very early at about 0,6V AC. i desoldered all transistors in the output stage and all were ok in diode and hfe check with a DMM. do these checks verify that the transistors are okay? where else could the problem of the amplifier be?
  Reply With Quote
Old 14th March 2010, 04:27 PM   #2
diyAudio Member
nigelwright7557's Avatar
Join Date: Apr 2008
Location: Carlisle, England
It could be anywhere prior to the output transistors.
I would whip out the other transistors and check them and while they are out check the other discrete components.

I assume you have checked the dc supply voltages ?
Murton-Pike Systems PCBCAD51 pcb design software.
  Reply With Quote
Old 14th March 2010, 06:01 PM   #3
diyAudio Member
east electronics's Avatar
Join Date: Jan 2006
Location: Athens GREECE
state model topology and or schematic could simply be a couple of fuses for example
  Reply With Quote
Old 15th March 2010, 12:57 AM   #4
diyAudio Member
Join Date: Feb 2010
Location: Bucharest
Send a message via Yahoo to Th3 uN1Qu3
First check the input stage, ie signal transistors and/or opamps. I once fixed an amp that insisted on distorting the right channel a lot earlier than the left. Pulled out all the signal transistors and one checked out as having a beta of like 10 vs 150+ for all the others. Sure enough, replacing that transistor made the right channel operate to spec.
  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
Non-Clipping Amplifier ph_christensen Solid State 46 2nd March 2014 06:26 AM
Recovery from clipping, soft clipping hahfran Solid State 49 23rd February 2010 01:03 AM
Early Class-D Article electrojim Class D 0 2nd March 2009 03:37 AM
Power Amplifier Clipping Indicator widi Solid State 2 1st March 2007 02:50 AM

New To Site? Need Help?

All times are GMT. The time now is 10:21 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