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.

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Select the appropriate signal source for each channel using the selector switch. 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.

The Aux input may also be used for processing the output from a dedicated guitar preamplifier, where the EQ can be used to further tailor the sound before it is compressed. The intended use of the audio insert jacks would be to patch in EQ egreverb or similar processing.

The Aux input is a valuable addition as it combines the virtues of a D. 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.

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. 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.

In general, a maximum gain reduction of between 10dB and 15dB will be adequate. For this drswmer, it is unwise to use more compression than is strictly necessary.

Drawmer – Manual

Use the Output Gain control to restore any level lost due to compression. It incorporates the same type of passive equalisation circuitry used in traditional tube guitar amps, while the Bright switch emulates the voicing of a typical guitar amplifier.

The use of compression on complete mixes can cause a dulling of the sound but the ‘s tube circuitry combined with the soft-knee action helps maintain the clarity and transparency of transient sounds.

The side-chain access point and the two different level insert points are unbalanced. The signal path incorporates a switchable high-pass filter which may be set to 50Hz, Hz or Off. The mic inputs provide up to 60dB of gain while maintaining a noise figure comparable with the better ‘in-desk’ mic preamps.


The tube gain stages are versatile enough to provide a clean, punchy sound or the gain may be increased to provide the type of overdrive sound associated with tube guitar amplifiers. The instrument preamplifier may be routed through either compressor channel or both and is suitable for a variety of signal sources, from electric guitars and basses to electronic keyboards.

The adjacent Clip LED illuminates when excessive mic gain has been applied and there is a danger of clipping. Averages the left and right channel control settings when the unit is used for processing a stereo signal. In linked mode, the compressor controls should, ideally, be set to the same settings as the control-circuitry for both channels responds to the average between the two channel settings. Re-connect to mains power source. This rotary switch selects the compressor input source.

DRAWMER 1960 Operator’s Manual

Because the compressor is a soft knee type, it requires few controls. For high quality location recording, the makes the perfect partner for a DAT machine, as it combines the functions of stereo mic preamp with that of a compressor. Because the compression system is based on the Soft Knee principle, the onset of compression is progressive, so no Ratio control is necessary. The threshold should be adjusted to give a gain reduction reading of around 5dB on signal peaks.

Balanced operation is recommended.

Rotate the cover plate one half turn, and refit the two screws. For mono use, each channel may be considered as being completely independent and set up accordingly. Because guitar sounds are so subjective, and because they vary so much with instrument and playing style, there are no hard and fast rules to setting up, but a good starting point is to switch Bright ‘On’ and set the compressor for ‘Med’ attack and ‘6’ release.

The actual attack time is further modified by the release setting chosen. Switchable Attack and Release settings are provided along with a fully variable Threshold, two of the Drawmet settings being programme dependent.

Using a number 1 size pozidrive screwdriver, remove the dawmer self-tapping screws holding the voltage selection switch cover plate on the rear panel. Determines the input level above which gain reduction will be applied and may be set in the range dB to infinity. As with other Drawmer 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.


Interestingly, the attack times are further modified by the choice of release setting so the range of choices are wider than it might first appear. A two position high or low gain switch provides an additional 10dB of gain when required for level matching or for creating overdrive effects.

Furthermore, when the compressor is deliberately overdriven, it can be used creatively to produce level drwmer effects which can be useful both on electric guitar or rock vocal sounds. 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. If more gain reduction appears necessary, it is worth considering applying a conservative degree of compression during recording and then further compression while mixing.

In addition, the incorporates two low-noise microphone preamplifiers with provision for phantom powering, plus a versatile instrument preamplifier with passive EQ and brightness switch. The Drawmer is a two channel unit with each channel comprised of a completely natural sounding “soft knee” vacuum tube compressor manuaal an extremely low noise microphone pre-amplifier with switchable 48 volt phantom power.

Passive equaliser control, which drwmer be set to provide up to 15dB of bass boost at 40Hz.

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

Combining eight active tube stages and the low noise and msnual of solid state electronics, the Drawmer provides the ultimate direct interface between the sound source and the recording medium. As an instrument amplifier, the provides gain, EQ and compression making it ideal for DI’ing guitars, basses and even keyboards.

If necessary, change the Attack and Release settings to suit the material. In Normal mode, the signal is passed through the compressor.