MikoKensington said:
I think DOA's on the filters was a feature added by Fabio. You can ask Jaakko about his Fabio Sontec build. He used Forssell's throughout his over-the-top build.
Yeah that's what I meant about olschool sontec
DIY builds. I know the original used NE5532 (or was it NE5534) for filters. In fact I tried those for my build as well. I liked it better than the OPA's, but in the end opted for LME49860. This is the way to go for analytical and distortion free sound. The difference above something like 5khz is remarkeable, especially if you want to lift those frequencies instead of just adding aphex aural exciter-like distorted "tizz". They allow high rail voltages also so they are a great match for DOA I/O.