DRAWMER OPERATORS MANUAL. CONTENTS: SAFETY CONSIDERATIONS INTRODUCTION APPLICATIONS INSTALLATION AUDIO CONNECTIONS. Vacuum tube compressor, Operators manual • Read online or download PDF • Drawmer Electronics Mic-Pre/Tube Compressor User Manual. Download DRAWMER MIC PRE COMP SCH service manual & repair info for electronics experts.

Author: Mazudal Mura
Country: Lesotho
Language: English (Spanish)
Genre: Love
Published (Last): 21 July 2004
Pages: 54
PDF File Size: 20.13 Mb
ePub File Size: 11.11 Mb
ISBN: 894-8-59655-376-3
Downloads: 43165
Price: Free* [*Free Regsitration Required]
Uploader: Fezragore

Soft-knee compressors are generally preferable for unobtrusive level control and the system used in the provides firm control without the side-effects of a fixed, hard-knee design. As with other Mamual products, the by-pass switch offers a choice of Normal, By-pass and Side Chain Listen modes so that if you have patched in any additional side chain processing, you can easily monitor what effect it is having. For this reason, it is unwise to use more compression than is strictly necessary.

In general, a maximum gain reduction of between 10dB and 15dB will be adequate. The same degree of gain reduction is applied to both audio channels to prevent image drzwmer which would otherwise occur whenever the left and right signal dynamics varied amnual each other by any significant degree. Determines the input level above which gain reduction will manul applied and may be set in the range dB to infinity. The attack and release times are switchable rather than being continuously variable and this method of operation falls into line with that of its all valve predecessors.

Select the drawmmer signal source for each channel using the selector switch. As an instrument amplifier, the provides gain, EQ and compression making it ideal for DI’ing guitars, basses and even keyboards. Switchable Attack and Release settings are provided along with a fully variable Threshold, two of the Release settings being programme dependent.

The actual attack time is further modified by the release setting chosen.

Three switchable Attack settings are provided giving Fast, Medium and Slow attack times. Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts.

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

Two sets of insert points on the rear panel allow additional effects manuao be added either before or during compression. If earth loop problems are encountered, do not disconnect the mains earth but instead, try disconnecting the signal screen on one end of the cables connecting the drawmeer of the to the patchbay.

Strictly speaking, a soft knee design does not have a rigidly defined threshold but the title ‘Threshold’ has been retained for the “amount of compression” control for the sake of familiarity.


For mono use, each channel may be considered as being completely independent and set up accordingly. If necessary, change the Attack and Release settings to suit the material. Because the compression system is based on the Soft Knee principle, the onset of compression is progressive, so no Ratio control is necessary.

In Normal mode, the signal is passed through the compressor.

Attack simply offers a choice of slow, medium and fast whilst release has six settings. The Threshold range is continuously variable between infinity and dB, the theory being that signals below the threshold are essentially unprocessed and the signals exceeding this manal are subjected to increasing amounts of gain reduction dependent on by how much they exceed the threshold.

This powerful combination of the classic valve circuit, offering unsurpassed tonality, and the low noise balanced microphone input with up to 60dB of gain has allowed engineers throughout the world to exploit the full potential of high performance condenser microphones.

The passive Bass and Treble controls are based on those used in classic tube guitar amplifiers while the Bright switch puts a peak in the frequency response at around 2kHz to simulate the voicing of a typical guitar amplifier.

The Vrawmer is a two channel unit with each channel comprised of a completely natural sounding “soft knee” vacuum tube compressor and an extremely low noise microphone pre-amplifier with switchable 48 volt phantom power.

Positions one to four have fixed release times whilst positions five and six are two different programme dependent release time modes making the unit ideally suited to programme material with complex dynamics such as complete stereo mixes and vocals. Because guitar sounds are so subjective, and because they vary so much with instrument and playing style, there are no hard and fast draw,er to setting up, but a good drswmer point is to switch Bright ‘On’ and set the compressor for ‘Med’ attack and ‘6’ release.

Switch settings 1 through to 4 provide progressively increasing release times, while positions 5 and 6 cause the release times to vary in a manner which automatically adapts to the dynamics of the incoming signal. Traditional moving coil manaul are used to monitor either the gain reduction or the output signal level while an output Gain control provides up to 20dB of make-up gain. Disconnect the unit from the mains. The signal path incorporates a switchable high-pass filter which may be set to 50Hz, Hz or Off.

In Stereo Link mode, both channels track together to avoid the inevitable image shifting that would occur if the two channels of a stereo signal were treated independently. An example of this would be the direct to digital stereo recording of live classical music without the necessity of a mixing console.


Switches the meters to show either the output level VU or the amount of gain reduction GR. Passive equaliser control, which can be set to provide up to 18dB of treble boost at 16kHz. There are four, dual-stage tubes in the audio signal dfawmer and the compressor section is designed to provide a soft-knee characteristic which contributes both to the sweet sound of the unit and to its ease of use.

Remove the cover plate and slide the switch fully to its opposite end.

Drawmer Electronics –

In linked manhal, the compressor controls manaul, ideally, be set to the same settings as the control-circuitry for both channels responds to the average between the two channel settings. The threshold should be adjusted to give a gain reduction reading of around 5dB on signal peaks. If for some reason the unit is to be used at a mains input operating voltage which is different to that as supplied, the following procedure must be carried out. For use with stereo signals such as complete mixes or submixes, the unit should be switched to Stereo Link mode and both sets of channel controls set to the same position.

The Gain control may be set to provide the required output level using the level meter as a guide. Adds 10dB draamer gain in the High position.

Avoid mounting the unit directly above power amplifiers or power supplies that radiate significant amounts of heat and always connect the mains earth to the unit.

A two position high or low gain switch provides an additional 10dB of gain when required for level matching or for creating overdrive effects. Using a number 1 size pozidrive screwdriver, remove the two self-tapping screws holding the voltage selection switch cover plate on the rear xrawmer. The two auto release switch settings continually drawer the compressor action to suit the dynamics of the material being processed, setting 5 being optimised for percussive material and setting 6 for general purpose use.

Furthermore, when the compressor is deliberately overdriven, it can be used creatively to produce level ‘pumping’ effects which can be useful both on electric guitar or rock vocal sounds.