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    RE-254 + RTP-35 Ribbon Microphone Basic DIY Kit

    RE-254 + RTP-35 Ribbon Microphone Basic DIY Kit

    125.00€
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    RM-6 Ribbon Microphone Full DIY Kit

    RM-6 Ribbon Microphone Full DIY Kit

    279.00€
    RM-6 Premium DIY Ribbon Microphone kit. Detailed Illustrated Assembly Manual: RM-5/RM-6 Ribbon Mic K...
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    RM-5 Ribbon Microphone Full DIY Kit

    RM-5 Ribbon Microphone Full DIY Kit

    199.00€
    Make Your Own Premium Quality DIY Ribbon Microphone! Detailed Illustrated Assembly Manual: RM-5 Ribb...
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    RM-5BS Ribbon Microphone Body for DIY Mic Project

    RM-5BS Ribbon Microphone Body for DIY Mic Project

    85.00€
    Stainless Steel Body for RE-254/RE-323 Ribbon Microphone Motors. RM-5BS is a premium quality body de...
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    RTP-35 Ribbon Microphone Output Transformer

    RTP-35 Ribbon Microphone Output Transformer

    59.00€
    Toroidal Output Transformer for Ribbon Microphones. Transformer is the second most important part ...
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    RTP-28 Ribbon Microphone Output Transformer

    RTP-28 Ribbon Microphone Output Transformer

    69.00€
    Toroidal Output Transformer for Ribbon Microphones. Transformer is the second most important part ...
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    Bumblebee Bb-D1 J-Fet Active DI Kit

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RTP-35 Ribbon Microphone Output Transformer
RTP-35 Ribbon Microphone Output Transformer RTP-35 Ribbon Microphone Output Transformer RTP-35 Ribbon Microphone Output Transformer
RTP-35 Ribbon Microphone Output Transformer

RTP-35 Ribbon Microphone Output Transformer

  • 59.00€
  • Product Code: RTP-35
  • Availability: In Stock

1 reviews / Write a review

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The price excludes 21% VAT (only applicable to orders from EU states). If you have a valid EU VAT number you will be able to enter it during the checkout for a VAT-exempt invoice.
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Toroidal Output Transformer for Ribbon Microphones.

Transformer is the second most important part in a classical ribbon microphone after, of course, a motor itself. While the motor defines the most of the sound character, the main purpose of a transformer is to amplify this very low level signal up to a working level, itself being as transparent as possible.

RTP-35 is a 1:35 output transformer of our own design for classical passive ribbon microphones. It was designed for both - application in new ribbon mic DIY projects and existing budget ribbon microphone modding. RTP-35 is a premium quality component with excellent sonic properties. The primary winding has high enough inductance to provide the proper loading for typical ribbon motors in the whole frequency range.

Why Toroidal Design?

Toroidal transformers have numerous advantages, just few of them to mention:

  • Probably the most important for ultra-low signal levels (as it is with ribbon motors): very high natural immunity to EMI (electromagnetic interference), meaning that hum and buzz will be less of a problem.
  • Very low winding wire length for the same number of turns comparing to bobbin types, meaning much lower DCR (direct current resistance), thus much lower signal loss and higher efficiency.
  • Flat response with high bandwidth.

Technical Data

  • Dimensions: 12.0 mm (H) x 24.0 mm (D)
  • Fits in a tube with minimum inner diameter of 25 mm (1")
  • Lead length: min. 100 mm (4")
  • Turns ratio: 1:35
  • Primary DCR: 0.01 Ohm (Yellow and White wires)
  • Secondary DCR: <5 Ohms (Red and Black wires)
  • Primary inductance: 5 mH
  • Phase shift: 3.5 deg @ 100 kHz
  • THD: 0.0035% @ 1 kHz
  • Low frequency roll-off: 20 Hz*

*20 Hz is an average number when used with typical low impedance ribbons (1.5" - 2.0" long), like RE-254 ribbon motor. This high-pass filter effect was added with intention to transformer in order to damp the subsonic rumble that ribbon microphones are so sensitive to and to compensate the resonance of the ribbon. It results in cleaner and flatter overall response and tight bass without "muddiness", that is often associated with ribbons.

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  • Pro Audio DIY (1)
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  • Ribbon Microphone DIY (11) +
    • Ribbon Mic Parts (5)
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