The Hammond 101D is a miniature audio potted transformer designed for applications requiring a compact and robust solution. Its rugged, potted construction provides excellent protection against environmental factors, making it suitable for demanding industrial environments. The transformer features a nominal impedance of 300 ct primary and 600 ct secondary, with a useful impedance range of 20.4-150 ohms for the primary and 54-600 ohms for the secondary. It is ideal for use in audio circuits where size and durability are critical.