SONY AC-940 AC940 Desktop Power Supply / Adapter - 9 Volt, 600mA 9 Volt, 600ma, center negative, black tip. Caompatible with: Olympus T-1000 Micro Cassette Transcriber Desktop Olympus T-2020 Micro-Mini Cassette Transcriber Desktop SONY M-2000 Micro Cassette Transcriber Desktop