Manual

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DRAWMER

Three-Band Stereo

Vacuum Tube Compressor

OPERATOR’S MANUAL

CONTENTS

Warranty

Safety Consideration

Chapter 1 - Introduction

Introduction

Installation

Audio Connections

Power Connection

Chapter 2 - Control Description

Control Description

Quick Setup Procedure

Chapter 3 - General Information

If a fault develops

Contacting Drawmer

Specification

Block Diagram

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Summary of content (11 pages)

PAGE 1
DRAWMER S3 Three-Band Stereo Vacuum Tube Compressor OPERATOR’S MANUAL CONTENTS Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Safety Consideration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Chapter 1 - Introduction Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation . . . . . . . . . .
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COPYRIGHT This manual is copyrighted © 2006 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 Electronics Ltd. ONE YEAR LIMITED WARRANTY Drawmer Electronics Ltd.
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CHAPTER 1 DRAWMER S3 THREE-BAND STEREO VACUUM TUBE COMPRESSOR INTRODUCTION The new S3 Three-Band Stereo Vacuum Tube Compressor incorporates the very latest in Ivor Drawmer designs and the aim from the very beginning was to create a 'no technical compromise' circuit using only the highest grade components. The S3 forms the basis of a 'Signature Series' and offers previously unattainable control and tonality over each of the three bands - gain control at each stage provides precise spectral balancing.
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INSTALLATION The S3 is designed for standard 19" rack mounting and occupies 3U of rack space. Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts. Always connect the mains earth to the unit. Because the S3 contains ten valves it will generate more heat than a simple solid state unit. Avoid mounting the unit directly above power amplifiers or power supplies that radiate significant amounts of heat.
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AUDIO CONNECTIONS The inputs and outputs are electronically balanced on conventionally wired XLRs (pin 1 screen, pin 2 hot, pin 3 cold and XLR shell is connected to chassis). The operating level is nominally +4dBu. Balanced use is recommended. fig.3 XLR WIRING • Ground Loops: If ground loop problems are encountered, never disconnect the mains earth, but instead, try disconnecting the signal screen on one end of each of the cables connecting the outputs of the S3 to the patchbay.
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CHAPTER 2 CONTROL DESCRIPTION BAND SPLIT The 6dB per octave crossover frequencies determine the points within the frequency spectrum one band stops to process audio, and another band takes over. 1 Low Split Frequency: 60Hz - 1.4kHz Sets the frequency point at which the split between low and mid bands occurs. 2 High Split Frequency: 1.4kHz - 14kHz Sets the frequency point at which the split between mid and high bands occurs.
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LOW BAND, MID BAND, HIGH BAND Threshold: infinity - -32dB all bands 3 Determines the level below which compression starts to take place. The S3 incorporates a Soft Knee, more compression is applied automatically as the input signal level increases, negating the need for a Ratio control. 4 Gain Reduction Meter: all bands Eight Leds at 0,-1,-3,-5,-7,-10,-15,-20dB 5 Big: Off - On low band only 6 Air: Off - On high band only 7 Attack: see Fig. 5 all bands 8 Release: see Fig.
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METERS 12 VU Meter: Two moving coil VU meters monitor either the level of the input or output signal. 13 Pad: Vu - +10dB - +20dB 14 Response: Peak VU - VU 15 Select: Output - Input A three-position switch adjusts the meters to show either normal output level, (and for those working at ‘hot’ output levels) VU +10dB or VU +20dB modes. i.e. with the switch at VU +10dB - when the VU meter reads 0dB the actual level is +10dB.
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QUICK SETUP PROCEDURE Please note that the following procedure is only a guide. All audio is different, requiring numerous settings, however, this should give a good staring point: 1) Set the compressor settings to be the same on all bands - Threshold at “infinite”, Gain at 0dB, the Attack in a mid position (2 or 3) and Release set to F(ast). The overall Gain control should be set to 0dB, and the Balance at 0.
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CHAPTER 3 GENERAL INFORMATION IF A FAULT DEVELOPS CONTACTING DRAWMER For warranty service please call Drawmer Electronics Ltd. or their nearest authorised service facility, giving full details of the difficulty. Drawmer Electronics Ltd., will be pleased to answer all application questions to enhance your usage of this equipment. Please address correspondence to: A list of all main dealers can be found on the Drawmer webpages.
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BLOCK DIAGRAM S3 ver 01 C 30/03/09 DRAWMER S3 OPERATOR’S MANUAL 11