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1961

VACUUM TUBE EQUALISER

OPERATORS MANUAL

CONTENTS

SAFETY CONSIDERATIONS

page 1

POWER CONNECTION

page 2

INSTALLATION

page 2

FUSES

page 3

INTRODUCTION

page 4

APPLICATIONS

page 5

CONTROL DESCRIPTIONS

page 5

OPERATION

page 7

IF A FAULT DEVELOPS

page 10

CONTACTING DRAWMER

page 10

TECHNICAL SPECIFICATION

page 11

BLOCK DIAGRAM

page 12

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Summary of Contents for 1961

Page 1: ...ERATIONS page 1 POWER CONNECTION page 2 INSTALLATION page 2 FUSES page 3 INTRODUCTION page 4 APPLICATIONS page 5 CONTROL DESCRIPTIONS page 5 OPERATION page 7 IF A FAULT DEVELOPS page 10 CONTACTING DRAWMER page 10 TECHNICAL SPECIFICATION page 11 BLOCK DIAGRAM page 12 i ...

Page 2: ...umber copy of the original sales invoice and a detailed description of the problem Drawmer will not accept responsibility for loss or damage during transit This warranty is void if the product has been damaged by misuse modification or unauthorised repair THIS WARRANTY IS IN LIEU OF ALL WARRANTIES WHETHER ORAL OR WRITTEN EXPRESSED IMPLIED OR STATUTORY DRAWMER MAKES NO OTHER WARRANTY EITHER EXPRESS...

Page 3: ...0mA WHERE THE MAINS INPUT VOLTAGE SWITCH IS SET TO 230 VOLTS AC AND 500mA WHERE THE MAINS INPUT VOLTAGE IS 115 VOLTS AC THE REAR PANEL H T FUSE MUST ALWAYS BE RATED AT 50mA IRRESPECTIVE OF THE MAINS VOLTAGE SETTING CAUTION MAINS CABLE DO NOT ATTEMPT TO CHANGE OR TAMPER WITH THE SUPPLIED MAINS CABLE CAUTION SERVICING DO NOT PERFORM ANY SERVICING REFER ALL SERVICING TO QUALIFIED SERVICE PERSONNEL WA...

Page 4: ...Fit a correctly rated fuse for the selected operation voltage 6 Reconnect to mains power source INSTALLATION The 1961 is designed for standard 19 rack mounting and occupies 2U of rack space Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts Because the tube circuitry generates more heat than an equivalent solid state design we recommend space be l...

Page 5: ... recommended The 1961 fully conforms to the EMC standards if you propose to use the unit where it maybe exposed to high levels of disturbance such as found close to TV and radio transmitters we suggest that the screen of the signal cable is connected to the chassis connection on the XLR type connector A further connection point is provided in the form of the Audio Insert jack on the rear panel Thi...

Page 6: ...setting up more accurate especially when treating stereo signals The 1961 has numerous applications in studio recording live sound location recording post production and as part of a musician s rack system It has the benefit of being both simple and intuitive to use and shares the traditional Drawmer styling adopted for the rest of the product range In addition to the four parametric equaliser sec...

Page 7: ... follows Input Enables the input gain to be varied over the range 20 to 20 dB A five segment LED meter shows the input level over the range 10 to 10dB measured after the input stage but before the equaliser sections The optimum setting is when the amber LED is normally illuminated and the 5dB LED lights occasionally High Pass This is a continually variable 12dB per octave shelving high pass filter...

Page 8: ...er is in circuit Low Pass This is a continually variable 12dB per octave shelving low pass filter which may be adjusted over the range 2 5kHz to 56kHz In This Bypass switch when pushed in will illuminate the red LED indicating that the Low Pass is in circuit EQ Out This acts as a Master Bypass switch If the switch is depressed the associated Out LED illuminates This indicates that all the equalise...

Page 9: ...ely independent and set up accordingly For use with stereo signals such as complete mixes or submixes both sets of channel controls should be set to the same position unless there is a specific reason for not doing so Setting up is best approached initially by switching In one filter section at a time Setting the Cut Boost control to maximum Boost and then switching through the available frequenci...

Page 10: ...ndwidth the noise performance can be improved by using the Low Pass filter to trim away the unused top end of the audio spectrum The filter frequency should be lowered slowly while monitoring its effect on the material being processed so as not to apply filtering and too low a frequency Examples of where this may be beneficial are when working on miked electric guitar sounds or some of the older e...

Page 11: ...High Pass filter to shave a bit off the bottom end Vocals different vocalists require different treatment but it is worth keeping in mind that the human voice is a familiar sound to all of us and we soon notice if it has been over treated In general use wide Octave settings and gentle amounts of boost to polish the sound and by overdriving the tube output stage just slightly a clinical solid state...

Page 12: ...original sales invoice and a detailed description of the problem Authorised returns should be prepaid and must be insured All Drawmer products are packaged in specially designed containers for protection If the unit is to be returned the original container must be used If this container is not available then the equipment should be packaged in substantial shock proof material capable of withstandi...

Page 13: ...ANCE Better than 40dB 20Hz to 10KHz NOISE AT UNITY GAIN with flat EQ response switched in circuit Wideband 22Hz 22KHz CCIR ARM IEC A Q Pk CCIR AV 87dB 94dB 96dB 97dB 85dB RMS 85dB 92dB 95dB DISTORTION THD Noise 1KHz XLR Input with BYPASS selected 0 1 XLR Input with NORMAL selected 0 3 POWER REQUIRED 115 Volt or 230 Volt AC at 50 60Hz 28 Watts FUSE RATING 250mA for 230 Volt 500mA for 115 Volt CONFO...

Page 14: ...1961 OPERATORS MANUAL 12 BLOCK DIAGRAM ...

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