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Old 26th February 2011, 06:06 PM   #11
SoNic_real_one is offline SoNic_real_one  United States
diyAudio Member
Join Date: Jan 2008
Location: Virginia
My recomandations for dual OpAmps (direct replacement), based on my tests in my DAC's (CD/DVD players):
LM4562 (LME49720 is identical), AD8599 or OPA2134.
I did try OPA2227 and they are ok too - but I dind't feel that are better that OPA2604.
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Old 28th April 2013, 06:26 AM   #12
4audioinc is offline 4audioinc
diyAudio Member
Join Date: Sep 2009
Just found out how good the OPA2604 chip is by accident... I have about twenty different chips or mods in clients gear... Recently did a LME49720NA combi for a dac unit and after getting a batch of defective (counterfeit) ic's from China, had to go a different route in the current mods for a customer... having a handful of 2604 ic, decided to give them a try... wow... ended up calling and upgrading other units to them... had no idea how musical they are.... and best part.. I do hove a good supply of them... I stock a lot of different ics for custom mods for clients. Still do need to look at the rail voltages doing these mods... did recently have good luck putting AD 8500 series in a Trident board using +/- 18.... after six months doing great... Check your pin outs for most of the duals and usually they are the same... lots to choose from currently.... (pun)... Lot of people rave about the 627... haven't heard them due to the price.. I feel there are other options... Bottom line.. out of about ten favorite chips, I like the 2604 best and personally use it now... Cheers!
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