Reply To: Schematics for AU90 transformer modification home › Forums › General Discussion › Schematics for AU90 transformer modification › Reply To: Schematics for AU90 transformer modification November 26, 2020 at 7:00 am #602 lotus123Participant @hifibuff, thank you. Did you encounter issues with wiring the two transformers out of phase? Did you keep the core inductor or had them removed like Will did?