Thermionic Culture ROBIN Passive DI Box

ITEM #: THER-ROBIN MFG #: ROBIN

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ROBIN - Overview

The Thermionic Culture ROBIN is a very simple box, but rather special in terms of quality and application, and has the following features:

  • NO solid-state transistors or ICs so NO 48V power required;
  • PHANTOM POWER to The Robin must be OFF;
  • HIGH spec transformer (E.A. Sowter) to match impedances;
  • BYPASS switch so that the transformer is out of circuit and you connect directly to the mic amp input. This works well with the Snow Petrel as it has a relatively high impedance input.
  • THE AMP JACK is connected directly to the DI JACK for a separate amplifier to be used;
  • EARTH LIFT disconnects the ground connection (Pin 1 of the XLR output) from the circuit in the box to prevent a hum loop which may occur if an external amplifier is used or the instrument is powered from a grounded mains supply;
  • SWITCH GUARDS are provided to protect the switches from possible damage and the box is of very rugged construction.
  • With the transformer in circuit is pretty basic but the following facts are worth noting in relation to the transformer:

    It has a 10:1 ratio and input impedance is 100x the input impedance of the mic amp, so a mic amp with 1kΩ input impedance means that the transformer will present a 100Ω load to the instrument.

    The frequency response is flat over the audio range and there is no measurable distortion added by The Robin.

    ROBIN - Required Accessories

      California Residents:
      WARNING:
      Cancer and Reproductive Harm - www.P65Warnings.ca.gov