Burn-in time for testing op amps ? - 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 2nd January 2004, 06:08 PM   #1
KlausB is offline KlausB  Germany
diyAudio Member
KlausB's Avatar
Join Date: Dec 2003
Location: Dresden
Default Burn-in time for testing op amps ?

Hi everybody,

for my phono stage I use the OPA627 and OPA603 in a composite topology as shown in the schematic below and I must admit that I am very pleased with its sonic performance.

Unfortunately the CFB OPA603 is out of production. In search for a suitable substitute I tried three alternative CFB op amps (LM6181, LT1206, AD811). Every op amp was allowed a burn-in for 24 hours prior to testing (connected to +/- 15V supply voltage for 24 hours). After first tests I chose feedback resistors of 820 Ohm instead of 1000Ohm for the three op amps to be tested.

The LM6181 and the LT1206 sounded harsher compared to the OPA603. On the other hand the AD811 seemed to lack some air and detail in the sonic image. To my disappointment none of the three op amps tested could qualify as a convincing substitute for the OPA603.

My question:

Were time and/or method for burning-in insufficient to test the op amps ? Did anyone made similar experiences ?

Regards and thanks

Attached Images
File Type: jpg compo.jpg (23.0 KB, 163 views)
  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
el84 burn in time ? mahleriana Tubes / Valves 1 27th December 2008 05:20 PM
Do Chip Amps (LM3876T) Require a Lot of Burn-In Time? Steve M Chip Amps 9 31st January 2008 12:12 PM
Burn-in Time for FE167E ttan98 Multi-Way 1 1st July 2006 01:25 PM
Burn-in time capacitors tubee Solid State 0 18th April 2005 08:15 AM
Woofer break burn in time? promitheus Multi-Way 4 18th November 2003 12:42 PM

New To Site? Need Help?

All times are GMT. The time now is 02:07 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