Input Transparency Sold Primary Impedance 5KΩ Transformer Ratio 1:1 Primary Inductance 60H Response 18Hz~80kHz (RP=5kΩ) Primary Allowable DC Current 30mA Maximum Output Voltage 150Vrms (10Hz) W83 × H104 × D75mm 2.3kg/piece There is no plate with the original box, but it seems to be an unused item from the state of the terminals!
Accessories: original box