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Drawmer 1962 Operator's Manual

Digital vacuum tube pre-amp
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1962
DIGITAL VACUUM TUBE PRE-AMP
OPERATORS MANUAL
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  • Page 1 1962 DIGITAL VACUUM TUBE PRE-AMP OPERATORS MANUAL...
  • Page 2 USE WILL NOT BE COVERED BY THIS WARRANTY. IN THE CASE OF A VALID WARRANTY CLAIM, YOUR SOLE AND EXCLUSIVE REMEDY AND DRAWMER’S ENTIRE LIABILITY UNDER ANY THEORY OF LIABILITY WILL BE TO, AT DRAWMER’S DISCRETION, REPAIR OR REPLACE THE PRODUCT WITHOUT CHARGE, OR, IF NOT POSSIBLE, TO REFUND THE PURCHASE PRICE TO YOU.

  • Page 3: Table Of Contents

    Stereo Mix page 15 " Digital Section D62-T/-A (where fitted) page 19 " Stereo Link operation CONFIGURATION: page 19 " Internal jumpers IF A FAULT DEVELOPS page 20 CONTACTING DRAWMER page 20 TECHNICAL SPECIFICATION page 21 BLOCK DIAGRAM page 22...
  • Page 4 Canadien des Communications. COPYRIGHT This manual is copyrighted © 1997 by Drawmer Electronics, Ltd. With all rights reserved. Under copyright laws, no part of this publication may be reproduced, transmitted, stored in a retrieval system or translated into any language in any form by any means, mechanical, optical, electronic, recording, or otherwise, without the written permission of Drawmer.

  • Page 5: Safety Considerations

    1962 OPERATORS’ MANUAL DRAWMER 1962 Digital Vacuum Tube Pre-Amp SAFETY CONSIDERATIONS CAUTION - MAINS FUSE TO REDUCE THE RISK OF FIRE REPLACE THE MAINS FUSE ONLY WITH A FUSE THAT CONFORMS TO IEC 127-2. 250 VOLT WORKING, TIME DELAY TYPE AND BODY SIZE OF 20mm x 5mm.

  • Page 6: Introduction

    24-bit digital output. Balanced microphone and line inputs are included making the 1962 a powerful and versatile tool in all areas of audio, including studio recording, live sound, location recording, post- production, mastering and as part of a musician's rack system.

  • Page 7: Applications

    Tube Drive control and its versatile equaliser/enhancer section. Because of its ability to modify and enhance the tonal quality of a signal, the 1962 is perfectly suited to stereo mix processing, subgroup processing, or to discerning mastering operations where the digital output may be used directly to feed a digital tape or disk-based editing machine.

  • Page 8: Installation

    If the unit is to be used where it may be exposed to high levels of disturbance (such as close to a TV or radio transmitter), we suggest that the screen of the signal cable be connected to the chassis connection on the XLR connector as opposed to connecting to pin1. The 1962 fully conforms to the EMC standards.

  • Page 9: Digital Connections

    The Stereo Mix In/Out sockets are stereo TSR jack connections which simplify connection of other 1962 units, stereo sends from a mixer, or similar line level device(s). The wiring convention is: ring, right channel, tip, left channel and sleeve ground. These signals are unbalanced and operate at a nominal +4dBu level.
  • Page 10 1962 OPERATORS’ MANUAL The LED will illuminate brightly and steadily if a reliable and compatible clock source is recognised.  The LED will blink when External Clock is selected on the front panel, but no external clock is detected. The LED will flicker dimly if the clock signal is inadequate due to problems such as level matching or signal corruption.

  • Page 11: Power Connections

    POWER CONNECTION The 1962 unit will have been supplied with a power cable appropriate for domestic power outlets in your country. For your own safety it is important that this cable is used. The unit should always be connected to the power inlet earth using this cable. Never disconnect this unit from the mains supply earth.

  • Page 12: Control Descriptions

    1962 OPERATORS’ MANUAL CONTROL DESCRIPTION The 1962 comprises two independent audio channels plus a Stereo Mix section, and both channels may be operated independently or linked for stereo operation. When used in linked mode, the control-circuitry for both channels responds to the average of the two channel settings.

  • Page 13: Microphone Pre-Amplifier

    Though the 1962 is not designed to replace a dedicated guitar preamplifier, the Gain controls may be used to deliberately overdrive the input stage, which respond in a similar way to a tube instrument amplifier.

  • Page 14: Line Input

    1962 OPERATORS’ MANUAL Gain: When depressed, provides an additional 20dB of gain to the auxiliary input. A Yellow status LED will illuminate. Bright: Switches in a 'presence' peak of around 10dB at 2KHz to simulate the voicing of a typical guitar amplifier. Because nearly all guitar amplifiers are voiced differently, it is likely that additional EQ will be required to achieve the desired sound.

  • Page 15: High And Low Pass Filters

    1962 OPERATORS’ MANUAL HIGH & LOW PASS The high and low pass filters are included to allow the user to attenuate undesirable sounds at the extremes of the audio spectrum, such as rumble, hum or hiss. They may also be used for creative applications, either on their own or in combination with conventional EQ.

  • Page 16: Enhance

    ENHANCE The 1962 includes advanced circuitry designed to enhance transient detail by dynamically controlling the phase and spectral content of the programme material. The LEDs...

  • Page 17: Tube Drive

    1962 OPERATORS’ MANUAL occur, but as the signal level falls below 0dB, low level, low frequency transients will be enhanced proportionally. High Enhance: This continually variable control applies enhancement by increasing the amount of harmonic energy already present in high-frequency, transient signals.

  • Page 18: Stereo Mix

    XLRs, and on one unbalanced stereo jack. To expand the flexibility of the 1962 further, up to three mix signals from other Drawmer 1962s or comparable line level stereo sources may be mixed in with the channel signals via the rear panel Stereo Mix jack inputs.

  • Page 19: Digital Section D62-T/-A (Where Fitted)

    Alesis ADAT™ (all variants) and compatible machines. The 1962 may be supplied with a D62 ready fitted, or one may be fitted retrospectively as a straightforward field upgrade that is available from your Drawmer dealer. No special tools are required for fitting, and no calibration procedures are necessary.
  • Page 20 MIX also enables up to 3 additional analogue inputs (eg. stereo outputs from other 1962 units) to be mixed via the rear panel Stereo Mix inputs to the master D62 digital output. Pre- or post- output level control is selectable on two internal jumper links.
  • Page 21 When the required resolution is greater than that of the multitrack machine, the 1962 splits the 2 digital signals into 3 channels, where the 3rd channel is used to store the remainder bits. For example, when using a 16bit multitrack machine to record a stereo 24bit signal, tracks 1,2, and 3 (or 5,6 and 7) must be selected.
  • Page 22 1962 OPERATORS’ MANUAL DITHER SELECTOR OPTIONS Position Dither and Noise Shaping Positions the noise shaped dither to the very top of the audio spectrum at a level of +30dB above the quantise noise floor. Because the ears are very insensitive at this frequency, the noise is inaudible, resulting in a subjectively clean signal with a wide dynamic range.

  • Page 23: Stereo Link Operation

    1962 OPERATORS’ MANUAL STEREO LINK Stereo Link: Averages the left and right channel signals to provide the same degree of gain reduction to both limiters and balance any low / high dynamic enhance. This prevents any image shifting which could occur whenever the left and right signal dynamics varied from each other by any significant degree.

  • Page 24: If A Fault Develops

    Drawmer Electronics Ltd., will be pleased to answer all application questions to enhance your usage of this equipment. Please address all correspondence to: Drawmer (Technical Helpline) : Coleman St.: Parkgate : Rotherham : S62 6EL : UK or, Email us on : tech@drawmer.com...

  • Page 25: Technical Specification

    1962 OPERATORS’ MANUAL TECHNICAL SPECIFICATIONS (All measurements taken at 0dBu operating level) INPUT IMPEDANCES LINE 20KΩ 150Ω to 600Ω 470KΩ MIC INPUT NOISE -128.5dB (@ +60dB gain) MAXIMUM INPUT LEVEL +28dBu OUTPUT IMPEDANCE 50Ω MAXIMUM OUTPUT LEVEL +22dBu (balanced) ANALOG BANDWIDTH...

  • Page 26: Block Diagram

    1962 OPERATORS’ MANUAL BLOCK DIAGRAM...

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