Toroida transformers havethe followingperfomance: 1.Low magnetic noise 2.High efficiency 3.Excellent load regulation 4.Easy assembly 5.Low no-load losses and magnetizing current 6.Low temperature rise 7.Various Input Options 8.Power range from 20VA to 5000VA available 9.According to customers requirement 10.Class B insulation system 11.Optional single or dual primary Inspectionitems: 1.No-load test(no-load current, no-load voltage, no-load loss) 2.Load test(load voltage, temperature rise) 3.Inductive voltage test 4.DC resistance test 5.Safety test Application: 1.Amplifier 2.Public broadcasting 3.Power supply 4.Audio System/Stereo 5.Decorative illumination system