Here are some more dual discrete op amps. Obviously the one in the back is not going to fit into most effects pedals, but it is interesting nonetheless.
I plan on conducting tests to see how the discretes perform against a few common chips. I suspect there will be a major difference in performance, and some of those characteristics could be interesting in pedals!
discrete opamp big muff? mmmmm
In a previous post I linked to a paper on op amp performance that includes data on discrete modules, though not the ones that are shown here.
I built a discrete op amp using the Urei design (using 5 transistors) that I put in a rat distortion that I modded, and it sounds pretty good!