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RTZ 9762A Owner's Manual

Legends 500 microphone preamplifier
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RTZ
PROFESSIO NAL
AUDIO
RTZ Professional Audio, LLC
Atlanta, GA USA
http://www.rtzaudio.com
COPYRIGHT © 2014, RTZ PROFESSIONAL AUDIO, LLC

MICROPHONE PREAMPLIFIER

9762A
LEGENDS 500
Owner's Manual
REV-A.03
05/12/2014

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Summary of Contents for RTZ 9762A

  • Page 1: Microphone Preamplifier

    PROFESSIO NAL AUDIO 9762A LEGENDS 500 MICROPHONE PREAMPLIFIER Owner’s Manual RTZ Professional Audio, LLC Atlanta, GA USA http://www.rtzaudio.com COPYRIGHT © 2014, RTZ PROFESSIONAL AUDIO, LLC REV-A.03 05/12/2014...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS WELCOME! ..........................3 OVERVIEW ..........................3 INSTALLATION AND CONNECTIONS.................. 4 3.1 E ..................4 NVIRONMENTAL ONSIDERATIONS 3.2 C ......................4 LEANING THE 3.3 M ..................... 5 ODULE ONNECTIONS FRONT PANEL CONTROLS ....................8 5.1 +48V P ..................9 HANTOM OWER NABLE...

  • Page 3: Welcome

    In the event of damage, retain all shipping and packaging materials for shipper damage claims inspection. The 9762A is designed to deliver a lifetime of musical pleasure and trouble free operation. If you experience any problems or difficulties, please contact us directly. Do not attempt to modify, alter or repair the unit yourself.

  • Page 4: Installation And Connections

    Environmental Considerations The 9762A is designed to operate reliably over a wide range of ambient temperatures. Always provide proper ventilation to avoid overheating conditions. This extends component life and provides maximum operational stability of the circuits.

  • Page 5: Module Connections

    This method provides full ground loop isolation since the 9762A is fully transformer isolated. The 9762A is designed for balanced mode operation as typically found in professional studio installations. While it can be wired for unbalanced operation, we highly recommend using balanced mode operation for reduced hum and interference.

  • Page 6: Design Features

    9762A – Preamplifier Owner’s Manual 4 Design Features The 9762A has been designed and built with great attention to detail. In particular, the input transformer and gain switching network have been painstakingly matched and optimized to present the proper load impedance to the microphone transformer (and hence, the microphone) at all gain settings.
  • Page 7 9762A – Preamplifier Owner’s Manual The SP (signal present) and OL (overload) LED’s provide input stage signal monitoring. In normal use the OL should not light to prevent signal distortion. The signal quality degrades rather quickly once the OL threshold is reached. The SP and OL LED’s monitor channel activity and clipping for the signal source currently selected by the DI switch.

  • Page 8: Front Panel Controls

    9762A – Preamplifier Owner’s Manual 5 Front Panel Controls 1. +48V Phantom Power Enable 2. +48V Power Status Indicator 3. Signal Overload (OL) Indicator 4. Gain Select Switch 5. Signal Present (SP) Indicator 6. Direct Input (DI) Source Select 7. Low-Z Microphone Impedance Select 8.

  • Page 9: Phantom Power Enable

    S1 on the lower PCB near the edge fingers can be used to completely disable phantom power to the microphone; this feature is useful to protect ribbon microphones when used with the 9762A. Overload Signal (OL) Indicator This LED indicates signal overload/clipping conditions at the input gain block stages.

  • Page 10: Line Output Polarity Invert Select

    9762A – Preamplifier Owner’s Manual Line Output Polarity Invert Select This switch inverts the line output polarity (phase) in the depressed position. Normally the unit will be used with polarity in the non-inverted state, however you may use this switch to reverse the polarity if needed.

  • Page 11: Operation

    9762A – Preamplifier Owner’s Manual 6 Operation The 9762A is designed for convenience and ease of use. In general you should experiment with a variety of microphones, placements and settings to achieve best results. The 9762A works well with all types of balanced microphones (dynamic and condenser) and is exceptionally suited for use with ribbon type microphones.

  • Page 12: Polarity And Impedance Selection

    9762A – Preamplifier Owner’s Manual Polarity and Impedance Selection The POL polarity switch inverts the polarity (or phase) of the line output transformer. When the POL switch is depressed a relay inverts the line output transformer polarity. In most situations the polarity will be used in normal phase with the POL switch in the non-depressed state.

  • Page 13: Hardware Configuration Features

    9762A – Preamplifier Owner’s Manual 7 Hardware Configuration Features The 9762A is equipped with a of number hardware configuration features that may be controlled via jumpers and a DIP switch. The phantom power feed may be completely disabled and disconnected from the microphone input signal lines if desired.

  • Page 14: Line Output Transformer Termination (Jp1)

    9762A – Preamplifier Owner’s Manual Line Output Transformer Termination (JP1) Jumper JP1 (see Figure 1) allows selecting the transformer termination resistor to either 1.5K or 600 ohms. Note that the termination resistor should be set to match the line out transformer secondary strapping configuration as listed in Table 2.
  • Page 15 The 9762A ships with the 48V LED configured for “Auto” (pins 1 & 2) mode as the default mode operation. This is the preferred mode of operation in most cases and the 48V LED will indicate the presence of phantom power either internally by 9762A or externally from another source.

  • Page 16: Specifications

    9762A – Preamplifier Owner’s Manual 8 Specifications Recommended Source Impedance ..... 200Ω balanced Recommended 9762A Load: ....... Low-Z (600Ω) Maximum Input Level .......... 0 dBu Output Level ............+27 dBu Maximum Maximum Gain ............ 75 dB Frequency Response .......... 20 Hz to 50 kHz ±1.5dB Output Distortion (THD+n)........

  • Page 17: Limited Warranty

    9 LIMITED WARRANTY RTZ Audio warrants this product to be free of defects in material and workmanship for a period of 5 years to the original owner. This warranty is enforceable by the original purchaser and is transferable to a subsequent single owner via resale by the current owner. The current owner must provide positive dated proof of the original purchase in the form of the original sales receipt, original canceled check, or other form of positive original proof.

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