This is one set Used Fidelity Research XF-1 H MC Step Up Transformer.
Type: step up transformer for MC cartridge
Input impedance: 19-40 ohms (H)
Load impedance: 47 to 50 Kohms
Maximum gain:18dB (H)
Frequency response: 5Hz to 50kHz
Output cable: 70cm
Dimensions: 158 x 70 x 120mm
Weight: 2.1kg