I don't think BerTTi has trickled down Etude/Ultima tech because in the info sheet, BerTTi doesn't have dual feed forward error correction which is core to the Etude/Ultima amps. I guess it's possible that BerTTi uses the same higher powered MOSFET from Chord Etude? So far, I haven't seen any additional Chord amplifier tech since the Etude/Ultima amp line was developed. I have to admit it's a little weird that the smaller Anni integrated amp has the dual feed forward error correction but BerTTi does not. So it's always possible that marketing for BerTTi forgot to add that. But if BerTTi has dual feed forward error correction, it would be the same as Etude except for the form factor, which would also be a bit weird.