1:1 Audio Transformer (273-1374) Specifications Faxback Doc. # 9888 Coil Turns Ratio:......................................................1:1 DC Resistance: Secondary:..............................................60 Ohms +/- 10% Impedance:....................................................600-900 Ohms Frequency Response:........................................300 Hz to 5 kHz Insulation Resistance:.....................More than 100 megohms at 250VDC (ALL-01/23/95)