Pro Co Sound MBT-1 1:1 Microphone Bridging Transformer

Pro Co Sound MBT-1 1:1 Microphone Bridging Transformer

Pro Co Sound MBT-1 1:1 Microphone Bridging Transformer


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Product Highlights

  • For Balanced Low Impedance Sources
  • 80% Nickel Core Lamination
  • Eliminates 60 Hz Buzz and Hum

Pro Co Sound PT1 overview

  • 1Description

The MBT-1 Microphone Bridging Transformer from Pro Co Sound is a carefully designed, custom-built 1:1 microphone bridging transformer whose characteristics are optimized for use with balanced low-impedance microphones or similar sources. Special winding techniques and a high-permeability (80% nickel) core lamination preserve full frequency response while minimizing signal losses and other "loading" effects. MU metal can and separate electrostatic shields for primary (input) and secondary (output) windings reduce capacitive coupling of ground-borne electrical noise between main and stage monitor or recording mixers, eliminating annoying 60-Hz hum and buzz. The source impedance of the MBT-1 is very similar to that of a low impedance microphone to ensure proper matching to the input circuitry of the mixer. The result is clean transient response (minimal overshoot or ringing) and low distortion even at low frequencies and high input levels.

In the Box
Pro Co Sound MBT-1 1:1 Microphone Bridging Transformer
  • 9" Color-Coded Lead
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description

    Pro Co Sound PT1 specs

    Voltage Loss <1.0 dB at 1.0 kHz

    All measurements made with 150 ohms source and 1.0 kOhms load to simulate typical real-world microphone and mic preamps (0 dBv ref = 0.775V).

    Input Impedance >1050 ohms at 1.0 kHz
    >1080 ohms at 10 kHz
    Nominal source impedance is 150 ohms
    Source Impedance Secondary:
    <270 ohms at 1.0 kHz
    <300 ohms at 10 kHz
    Nominal output impedance is 1.0 kOhms
    Total Harmonic Distortion <0.03% 20 Hz to 20 kHz at -30 dBv output
    <0.1% 30 Hz to 20 kHz at -15 dBv output
    <0.25% 20 Hz to 20 kHz at -15 dBv output
    Maximum Input Level For 1% THD:
    0 dBv at 20 Hz
    +4 dBv at 30 Hz
    +8 dBv at 50 Hz
    Frequency Response 20 Hz to 20 kHz, ± 0.5 dB at -15 dBv output
    -3 dB at approximately 65 kHz
    Phase Response <-20° at 20 kHz (refer 1.0 kHz)
    Rise Time <4.5 μs (2.0 kHz square wave, 10 to 90%)
    Overshoot <1%
    Voltage Common Mode:
    >1500 VRMS (maximum)
    Common Mode Rejection >80 dB at 1.0 kHz
    Turns Ratio 1:1
    Impedance Ratio 150:150 ohms
    Primary Impedance Source Impedance: 1.0 kOhm (typical microphone)
    Secondary Impedance 1.0 kOhm (typical microphone preamp)
    Shield Faraday Shield: 2 shields with separate leads
    Material Core: 80% nickel alloy
    Maximum Input Level At 20 Hz: 0 dBv (ref = 0.775 V)
    Physical Characteristics
    Package MU metal can
    Termination 9.0" (228.6 mm) 28 AWG tinned copper, color-coded leads
    Mounting 2 holes, 0.09375" (2.3813 mm) diameter, 0.7185" (18.2499 mm) centers

    It is recommended to use only #4 Type-B self-tapping screws to mount transformer through mounting holes. They do not allow more than 0.15" of penetration into the transformer housing.

    Dimensions (L x W x H) 1.125 x 1.125 x 1.050" (28.575 x 28.575 x 26.670 mm)

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