Terrapin Audio EMI REDD 47 Mic Preamp Input Transformer 1:7 Cobalt Amorphous Core Chandler \ Abbey Road studios Perfect for repair of REDD 47 by vintage transformer replacement or for DIY clone build, Both Primary and secondary windings have CT MuMetal Shield encapsulation Feel free to contact me regarding compatibility with your application or with any tech questions, Toroid Cobalt Amorphous Core Extra low Hysteresis loss, excellent inductance per turn over wide frequency range and low DCR makes it best core material for low level signals with exceptional transient response, Frequency response: 10Hz-50kHz +0\-0.5db with Minimal Phase Shift and THD Dimensions: ~35mm diameter with 20mm height

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Please note that the transformer shields types may vary depending on the batch