... amplifier 4 electrical Product Description for Toroidal transformer: Professional power supply transformer used for the field of pro-amplifier ... lamp, UPS industry, industrial control area ect….: Specifications:1 Frequency:50-60HZ2 Material :copper ,aluminum3 Power range :500VA to ... , 120V, 230V, 240V / 50 Hz c. Secondary Customized Power range: 20VA to 10KVAd. Standard UL506, UL1411, EN61558, EN6060 ...