R1, R44 burning up- ax-100 - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 28th May 2009, 10:26 PM   #1
diyAudio Member
 
Join Date: May 2008
Default R1, R44 burning up- ax-100

Help

Ive just changed the position of the output fets( grouped them correctly) on the heatsink and restarted.

Now output resistors are smoking (R1, R44)

This aleph-x was working fine and no other changes were made except for position of the irfp240s.

Anyone enlighten me what could have gone wrong.?
my guess is broken fet but a quick measure reads correct on multimeter.
  Reply With Quote
Old 29th May 2009, 01:01 AM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Could be disconnected Gates.

  Reply With Quote
Old 29th May 2009, 01:28 AM   #3
Blues is offline Blues  United States
Lightning In A Bottle
diyAudio Member
 
Blues's Avatar
 
Join Date: Sep 2003
Location: The Milky Way
Could be shorted Drain(s) to heatsink...
__________________
Life simplified! Leap into the Warpspeed wormhole... http://www.6moons.com/audioreviews/warpspeed/1.html
  Reply With Quote
Old 29th May 2009, 02:09 AM   #4
diyAudio Member
 
Join Date: May 2008
Thanks for the quick response Nelson and Blues!

But... Ive just checked both the gates to board which are good and also Drain to heatsink which is also good.

Ive just swapped the other board in there and getting same problem, so its either fet or power supply.

this might keep me working late into the night, lucky Im off for the weekend, long weekend, just hope I dont try to solve it to much in my head over the next few days.

Or it could be incorrect connection to board.

mmmmmmmm
  Reply With Quote
Old 2nd June 2009, 12:01 AM   #5
diyAudio Member
 
Join Date: May 2008
Well Ive found the problem

Lets hope its the only one.

Somehow I destroyed 3 of 4 of my lovely balanced IRF9610.

weekend break was what I needed.
  Reply With Quote
Old 2nd June 2009, 02:05 AM   #6
diyAudio Member
 
Join Date: May 2008
In fact all the rest of my batch of IRF9610 are toast except one, these little guys must be very sensitive, good lesson to learn, I was very blarsay with handling them.
  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
The Burning Amp Festival-Burning Gadgets Preview Zen Mod Everything Else 115 27th October 2007 05:50 PM


New To Site? Need Help?

All times are GMT. The time now is 05:57 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