I've used up all my 072's and the like, but I've got three 5532's. What do you think?
If your curious what the upper side of a mutron's circuit board looks like, I just uploaded a pic. I did a few repairs on this one a couple months ago, if you notice the rotary switch is broken. The chips had no markings whatsoever. The pic is slightly blurred.
http://members.localnet.com/~cgoodson/images/DSCF0004.JPG
5532's are fine opamps - even more quiet than 072's.
I use them in HiFi-applications - for example in my new RIAA-amp I built - and I love them.
For even better preformance (if that's possible :wink: ) try the OPA2134 - but they are expensive - ouch!