More info at Jensen transformers website: - High Performance Audio Op-Amp Quick Reference (14KB PDF) http://www.jensen-transformers.com/as/as050.pdf You can also ask for a copy of the AES paper: "JE-990 Discrete Operational Amplifier" at http://www.jensen-transformers.com/viewing.html Edu _____________________ ES2 Audio - Som & Luz Salvador-Bahia-Brasil