Terrapin Audio Output transformer for Ribbon Microphone 1:30 Toroid Cobalt Amorphous Core Best core material for low level signals:

• Dimensions: 26.0 mm (Diameter) x 14.0 mm (Height)

• Turns ratio: 1:30

• Primary DCR: 0.01 Ohm

• Secondary DCR: 10 Ohms

• Primary inductance: 8 mH

• Phase shift: 2 deg @ 100 kHz

• THD: 0.0025% @ 1 kHz

Extra low Hysteresis loss, excellent inductance per turn over wide frequency range and low DCR,This core material does not store energy (unlike common Permalloy \ mu-metal cores), thus Low frequency resonance with external series capacitance is practically eliminated.All these facts make Cobalt Amorphous alloy the best core material for low level signals with exceptional transient response, Other ratios and transformer types are available (including microphone preamp input \ output and condenser mic output)