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RTZ 9762 Owner's Manual

Dual-combo microphone preamplifier
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P R E L I M I N A R Y
Model 9762
ALL INFORMATION SUBJECT TO CHANGE
DUAL-COMBO

MICROPHONE PREAMPLIFIER

Owners Manual
RTZ Professional Audio
4260 Pine Vista Blvd
Alpharetta, GA 30022 USA
http://www.rtzaudio.com
COPYRIGHT © 2003-2004, RTZ AUDIO
REV-C
12/06/2004

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Summary of Contents for RTZ 9762

  • Page 1: Microphone Preamplifier

    P R E L I M I N A R Y Model 9762 ALL INFORMATION SUBJECT TO CHANGE DUAL-COMBO MICROPHONE PREAMPLIFIER Owners Manual RTZ Professional Audio 4260 Pine Vista Blvd Alpharetta, GA 30022 USA http://www.rtzaudio.com COPYRIGHT © 2003-2004, RTZ AUDIO REV-C 12/06/2004...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS WELCOME!..........................1 OVERVIEW ..........................1 AC VOLTAGE SELECT AND SAFETY FUSES ..............2 3.1 I ................2 NTERNAL REAMPLIFIER AFETY USES 3.2 L AC F ................2 OLTAGE ELECT AND INSTALLATION AND CONNECTIONS.................. 3 4.1 AC P ....................

  • Page 3: Welcome

    In the event of damage, retain all shipping and packaging materials for shipper damage claims inspection. The 9762 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: Ac Voltage Select And Safety Fuses

    Owners Manual 3 AC Voltage Select and Safety Fuses The 9762 may be configured for either 115V or 230V operation at 50 / 60 Hz via the line voltage select card inside the power entry module on the rear panel. Always disconnect power and remove all connectors from the unit before servicing or changing the line voltage configuration.

  • Page 5: Installation And Connections

    Owners Manual 4 Installation and Connections The 9762 is designed for standard 1U 19” rack mounting. Ideally, the unit should be mounted where cool air flows across the unit. Do not obstruct the flow of air around and across the preamplifier enclosure. In tight equipment enclosures, consider placing a ventilated rack panel to allow increased airflow.

  • Page 6: Design Features

    Model 9762 – Dual Combo Owners Manual 5 Design Features The 9762 has been designed and built with great attention to detail. In particular, the input transformer and gain stepping network have been painstakingly matched and optimized to present the proper load impedance to the microphone at all gain settings.

  • Page 7: Gain Blocks And Metering

    Model 9762 – Dual Combo Owners Manual Gain Blocks and Metering The 9762 provides up to 75 dB maximum gain using a dual gain block type design. Gain is selectable from –20 dB to -75 dB in 5 dB increments via the twelve position rotary switch. At higher gain settings (above -50 dB), a second gain block is inserted into the signal path for additional gain and increased headroom.

  • Page 8: The Controls

    Model 9762 – Dual Combo Owners Manual 6 The Controls 1. +24V Status Indicator This LED indicates +24V power status for each channel. If both channel power LED’s fail to light when the unit is powered on, check to make sure the AC outlet and line cord are working properly, otherwise, check the AC line fuse on the rear panel of the unit.
  • Page 9 Model 9762 – Dual Combo Owners Manual 5. Signal Overload (OL) Indicator This LED indicates signal overload/clipping conditions at the input gain block stages. In normal use the LED should not light or flicker. Reduce the input GAIN switch to lower the input gain and avoid clipping.

  • Page 10: Operation

    Model 9762 – Dual Combo Owners Manual 7 Operation The 9762 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 9762 works well with all types of balanced microphones (dynamic and condenser) and is exceptionally suited for use with ribbon type microphones.

  • Page 11: Polarity And Impedance Selection

    In most cases low impedance is desired for 50-Ohm impedance microphones. Most modern microphones expect a bridging load and the 9762’s input circuitry accommodates this when the impedance switch is OUT. Experiment with this feature using a variety of microphones to obtain the best sound and tonal qualities.

  • Page 12: Specifications

    Model 9762 – Dual Combo Owners Manual Specifications 200 Ω balanced Recommended Input Impedance: 600 Ω Recommended Output Load: +4 dBm into 600 Ω Nominal Line Output Level: Maximum Input Level: 0 dBu +27 dBu bridging or +27 dBm into 600 Ω...

  • Page 13: Limited Warranty

    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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