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Output power: 75W Primary resistance: 3.5-4.5 kOhm Secondary resistance: 0-4-8 Ohms Frequency response: 10Hz-50KHz -2dB Iron core: 38mm x70 Dimension: 95mm x116mm x117mm (H) Weight: 5.7kG each Application: 300B, FU33, FU80, FU81, etc.