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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Compressing during a 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.

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. Using a number 1 size pozidrive screwdriver, remove the two self-tapping screws holding the voltage selection switch cover plate on the rear panel. 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.

For your own safety it is important that you use this cable. The fully conforms to the EMC standards, if you propose to frawmer the unit where it maybe exposed to high levels of disturbance such as found 196 to a TV or radio transmitter janual suggest that the screen of the signal cable is connected to the chassis connection on the XLR type connector.

It mannual 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.


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. The signal path incorporates a switchable high-pass filter which may be set to 50Hz, Hz or Off. 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. For this reason, it is unwise to use more compression than is strictly necessary.

The unit should always be connected to the mains supply earth using this cable.

DRAWMER 1960 Operator’s Manual

This is judged partly by ear and partly by observing the gain reduction meter. Three switchable Attack settings are provided giving Fast, Medium and Slow attack times. Rotate the cover plate one half turn, and refit the two screws. Because the meter has VU characteristics, it closely reflects what drqwmer actually being heard, though will not respond quickly enough drawner register short signal peaks.


Two sets of insert points on the rear panel allow additional effects to be added either before or during compression.

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

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.

A major advantage of the hybrid approach is that it combines the reliability and stability of modern solid-state designs with the warm, detailed sound of vintage classic tube designs. 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. 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.

This stage may be deliberately overdriven if required to add tonal coloration to an instrument, and with the addition of an external speaker simulator, overdriven guitar sounds may be Directly Injected “DI’d” into the mixing console. Equalization is provided along with sufficient gain to overload the tube pre-amp for sustain effects. The threshold should be adjusted to give a gain reduction reading of around 5dB on signal peaks. The side chain access points may be used to patch in equalisers to enable the compressor to act as a de-esser.

In general, a maximum gain reduction of between 10dB and 15dB will be adequate. Because the compressor is a soft knee type, it requires few controls.

In linked mode, the kanual controls should, ideally, be set to the same settings as the control-circuitry for drawner channels responds to the average between the two channel settings. There are four fixed Release times and a further two which are programme dependent. By adding compression to an overdriven sound, the degree of sustain can be maintained at a lower overdrive setting while the tube circuitry will add warmth and punch.

As an instrument amplifier, the provides gain, EQ and compression making it ideal for DI’ing guitars, basses and even keyboards.

Drawmer – Manual

Replace with a correctly rated fuse for the selected operation voltage. Balanced operation is recommended. Because the compression system is based manul the Soft Knee principle, the onset of compression is progressive, so no Ratio control is necessary. Bypass only takes the compressor mamual of circuit leaving the vacuum tube warmth in the circuit path; the output signal is taken from the signal insert return point.

Passive equaliser control, which can be set to provide up to 18dB of treble boost at 16kHz. 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.


Avoid running at excessively high output levels as this reduces the available amount of signal headroom and could lead to distortion in extreme cases. Combining eight dtawmer tube stages and the low noise and reliability of solid state electronics, the Drawmer drawner the ultimate direct interface between the sound source and the recording medium.

The intended use of the audio insert jacks would be to patch in EQ egreverb or similar processing.

By increasing the Gain control setting, the input stage can be made to overdrive in a manner similar to that of traditional valve guitar amplifiers. Switch settings 1 through to 4 provide progressively increasing release times, while positions 5 and 6 cause the release times to vary in a maanual which automatically adapts to the dynamics of the incoming signal. 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.

This fully variable control sets the mic input gain over the range 0 to 60dB.

This rotary switch selects the compressor input source. The Aux input is a valuable addition as it combines the virtues of a D. The two auto release switch settings continually optimise 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.

There are four, dual-stage tubes in the audio signal path 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. In addition to the balanced microphone and line inputs on the rear of the unit an auxiliary input on the front panel gives direct access for guitars or electronic instruments.

In Normal mode, the signal is passed through the compressor. The mic inputs provide up to 60dB of gain while maintaining a noise figure comparable with the better ‘in-desk’ mic preamps.

For mono use, each channel may be considered as being completely independent and set up accordingly.

Gain The Output level may be amplified or attenuated by up to 20dB to compensate for level changes caused by compression and limiting.