Features: Selection of high quality material, work stable, practical convenience, and with long severing life. These isolation transformers are all high efficiency audio transformers. The primary and secondary windings are tightly coupled, there is sufficient pass frequency band, the original winding inductance is large, the leakage inductance is small, can reduce the influence of the hysteresis loss.Specifications: Voltage ratio: 1:1 AC Impedance: 600 ohms DC Impedance: 135 ohmsPower supply phase: single phase Moisture-proof mode: open Cooling mode: oil immersed air cooled Frequency characteristics: intermediate frequency Windability : Double-wire winding Core form: amorphous alloy Core shape: EI type Appearance structure: vertical Weight: 40 g Package Included: 1 x 10pcs/pack Audio Transformers.