Terrapin Audio LA2 A-24 Microphone Compressor Output Transformer 5:1 Tube Nanocr Terrapin Audio LA2 A-24 Microphone Compressor Output Transformer 5:1  Nanocrystalline Audio Core, 15k:600ohm Perfect for Teletronix LA-2A compressor UTC A-24 output transformer replacement or for DIY other vintage model build, Feel free to contact me regarding compatibility with your application or with any tech questions about the build, Toroid Nanocrystalline Audio Core Low saturation at high levels, High Induction amplitude 1.2T, Low Hysteresis loss, excellent inductance per turn over wide frequency range and Low DCR makes it best core material for high level audio signals with exceptional transient response, Frequency response: 20Hz-20kHz +0\-0.3db with Minimal Phase Shift and THD Max lvl: +30 dBu Primary inductance: 150H Nominal Input impedance Zi: 15kΩ Faraday shield between windings