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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The passive Bass and Treble controls are based on those used in classic tube guitar amplifiers while the Bright switch puts a peak mannual the frequency response at around 2kHz to simulate the voicing of a typical guitar amplifier. Because the tube circuitry generates more heat than an equivalent solid-state design, it is advisable to leave space above the unit to allow the heat to dissipate.

drawmrr A two position high or low gain switch provides an additional 10dB 19660 gain when required for level matching or for creating overdrive effects. 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. Compressing during mznual mix does increase the subjective level of tape and other background noises during pauses and quiet passages as maximum gain is applied when the signal level is minimum.

Rotate mmanual cover plate one half turn, and refit the two screws. The Threshold range is continuously variable between infinity and dB, the drawmfr being that signals below the threshold are essentially unprocessed and the signals exceeding this threshold are subjected to increasing amounts of gain reduction dependent on by how much they exceed the threshold. 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 side chain access points may be used to patch in equalisers to enable the compressor to act as a de-esser. Drwmer adding compression to an overdriven sound, the degree of sustain can be maintained at a lower overdrive setting while the rrawmer circuitry will add warmth and punch. 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. 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.

Phantom power is individually switchable on the two channels and a peak overload LED warns when clipping is imminent. The 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 a TV or radio transmitter we suggest that the screen of the signal cable is connected to the chassis connection on the XLR type connector.


A further auxiliary instrument pre-amp with EQ is also provided. The instrument preamplifier may be manuwl through either compressor channel or both and is suitable for a variety of signal sources, from electric guitars and basses to electronic keyboards.

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

Passive equaliser control, which can be set to provide up to 18dB of treble boost at 16kHz. Disconnect the unit from the mains. The two auto release switch settings continually optimise the compressor action to suit the dynamics of the material being processed, setting 5 draemer optimised for percussive material and setting 6 for general purpose use.

The intended use of the audio insert jacks would be to patch in EQ egreverb or similar processing. Select the appropriate signal source for each channel using the selector manua. 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. There are four fixed Release times and a further two which are programme dependent.

Avoid running at excessively high output levels as this reduces the available amount of signal headroom and could lead to distortion in extreme cases.

Setting up is simplified by the soft-knee compressor action which means that it is only necessary to adjust the Threshold control until the desired degree of gain reduction is achieved.

Bypass only takes the compressor out of circuit leaving the vacuum tube warmth in the circuit path; the output signal is taken from the signal insert return point. The mic inputs provide up to 60dB of gain while maintaining a noise figure comparable with the better ‘in-desk’ mic preamps. The Drawmer 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.

Replace with a correctly rated fuse for the selected operation voltage. In general, a maximum gain reduction of between 10dB and 15dB will be adequate. Because the compression system is based on the Soft Knee principle, the onset of compression is progressive, so no Ratio control is necessary.

Passive equaliser control, which can be set to provide up to 15dB of bass boost at 40Hz. Gain The Output level may be amplified or attenuated by up to 20dB to compensate for level changes caused by compression and limiting. The microphone input stages feature extremely low noise, balanced input circuitry with additional tube amplification, enabling modern microphones to take on the characteristics of older tube models. 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.


Its use is to attenuate low frequency signals that might otherwise prove troublesome, eg. If more gain reduction appears necessary, it is worth considering applying a conservative degree of compression during recording and then further compression while mixing.

Drawmer Electronics Mic-Pre/Tube Compressor User Manual | 13 pages

The actual attack time is further modified by the release setting chosen. Re-connect to mains power source.

The subtle tube colorations add warmth and depth to the sound, while at the same time emphasising mid-range and high-frequency detail. 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 outputs of the to the patchbay. Because the meter has VU characteristics, it closely reflects what is actually being heard, though will not 19600 quickly enough to register short signal peaks.

Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts. The Gain control may be set to provide the required output level using the level meter as a guide.

Switch settings 1 through to 4 provide progressively increasing release times, while positions 5 and 6 cause the release times drrawmer vary in a manner which automatically adapts to the dynamics of the incoming manua.

In Stereo Link mode, both channels track together to avoid the inevitable image shifting that would occur if the two channels manyal a stereo signal were treated independently. If necessary, change the Attack and Release settings to suit the material. This fully variable control sets the mic input gain over the range 0 to 60dB.

DRAWMER 1960 Operator’s Manual

There is little doubt in the minds of many engineers and producers that vacuum tubes possess a unique sound quality providing a “warmer, more alive” sound. Determines the input level above which gain reduction will be applied and may be set in the range dB to infinity. In linked mode, the compressor controls should, ideally, be set srawmer the same settings as the control-circuitry for both channels responds to the average between the two channel settings.