Pro Co Sound MBT-2 1:1:1 Microphone Bridging Transformer

Pro Co Sound MBT-2 1:1:1 Microphone Bridging Transformer

Pro Co Sound MBT-2 1:1:1 Microphone Bridging Transformer

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Pro Co Sound MBT-2 1:1:1 Microphone Bridging Transformer

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Expected availability: 7-10 business days

Product Highlights

  • For Balanced Low Impedance Sources
  • 80% Nickel Core Lamination
  • Eliminates 60 Hz Buzz and Hum
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  • 1Description

The MBT-2 Microphone Bridging Transformer from Pro Co Sound is a carefully designed, custom-built 1:1:1 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 each secondary (output) winding reduce capacitive coupling of ground-borne electrical noise between main, stage monitor and recording or broadcast feed mixers, eliminating annoying 60-Hz hum and buzz. The source impedance of the MBT-2 is very similar to that of a low-impedance microphone to ensure proper matching to the input circuitry of the mixers. The result is clean transient response (minimal overshoot or ringing) and low distortion even at low frequencies and high input levels..

UPC: 765811044055
In the Box
Pro Co Sound MBT-2 1:1:1 Microphone Bridging Transformer
  • 9" Color-Coded Lead
  • Limited 1-Year Warranty
  • Table of Contents
    • 1Description
    Performance
    Voltage Loss One Secondary Loaded: < 1.2 dB
    Both Secondaries Loaded: < 2.5 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 One Secondary Loaded: > 1070 ohms, > 1090 ohms
    Both Secondaries Loaded: > 570 ohms at 1.0 kHz, > 570 ohms at 10 kHz
    Source Impedance Secondary:
    One Secondary Loaded: < 285 ohms < 310 ohms
    Both Secondaries Loaded: < 255 ohms at 1.0 kHz, < 270 ohms at 10 kHz
    Total Harmonic Distortion < 0.03% 20 Hz to 20 kHz at -30 dBv output
    < 0.1% 30 Hz to 20 kHz ar -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 One Secondary Loaded: -0.5, -0.25, & -3.0 dB at 120 kHz
    Both Secondaries Loaded: -0.25 dB @ 20 Hz, -0.10 dB @ 20 kHz, -3.0 dB @ 140 kHz
    Phase Response At 20 kHz:
    < -18 / -13°
    Rise Time 2.0 kHz Square Wave, 10 to 90%:
    < 3.0 / 2.4 μs
    Overshoot < 1 / 3%
    Voltage Common Mode:
    >1500 VRMS (maximum)
    Common Mode Rejection >80 dB at 1.0 kHz
    General
    Turns Ratio 1:1:1 (2 secondaries)
    Impedance Ratio 150:150:150 ohms
    Primary Impedance Source Impedance: 1.0 kOhm (typical microphone)
    Secondary Impedance 1.0 kOhm (typical microphone preamp)
    Shield Faraday Shield: 3 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 1.063" (28.575 x 28.575 x 27.000 mm)
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