Opamps changed => metallic sound - 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 21st March 2004, 08:05 PM   #1
roibm is offline roibm  Romania
Join Date: Dec 2003
Location: Transylvania
Default Opamps changed => metallic sound

So, I finally changed all the opamps beside the opamps on the DAC(those are SMD and are not here yet).
I used OPA2132P for replacing them. The $.01 elcos bypass caps were replaced with pana fc for the same values(10uF and some 4.7uF)

What to say, it sounds much much better, a lot of fine details, but also somehow metallic(like a metallic resonance, mini-delay).
Any idea where is this comming from? OPA2132P?
Unfortunately I have no other opamps available...

Just for reference, the voltage fed to the opamps is +-15V
  Reply With Quote
Old 22nd March 2004, 05:00 AM   #2
djk is offline djk
diyAudio Member
djk's Avatar
Join Date: Feb 2001
Location: USA
What do you have in parallel with the 10F caps? Values in the range of 0.01F~0.1F are normally used. I like stacked film types for these.

Not all arbitrary combintion of bypass caps are stable. Ringing (imagine a mirrored hallway) can occur.
  Reply With Quote
Old 22nd March 2004, 11:17 AM   #3
roibm is offline roibm  Romania
Join Date: Dec 2003
Location: Transylvania
At first I might have been wrong, it may be that those 10uF caps are not bypass caps but coupling caps(if the topology(?) is the same like in DAC).
And as they are right now, they got nothing in paralell, but I am thinking about getting something. Other possibility would be using some MKT(not enough space for MKP) eventually bypassing those as well(for best quality).

But could it be that the metallic sound is caused by these caps? I mean the old caps were worst, so was the old opamp.
  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
FS: Tubes, opamps and a sound card sachi Swap Meet 10 10th September 2009 11:22 PM
Help with OpAmps frames & Sound Changes irgendjemand Solid State 28 15th April 2008 01:43 PM
Sound of parallel opamps. Bernhard Solid State 16 28th March 2004 05:31 PM
The sound of concatenated opamps. Circlotron Solid State 36 26th February 2004 03:15 PM
Metallic case manufacturer Koy Solid State 0 15th November 2002 11:39 AM

New To Site? Need Help?

All times are GMT. The time now is 06:49 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