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 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 threshold are subjected to increasing amounts of gain reduction dependent on by how much they exceed the threshold.
Because the compressor is a soft knee type, it requires few controls.
DRAWMER 1960 Operator’s Manual
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. Combining eight active tube stages and the low noise and reliability of solid state electronics, the Drawmer provides the ultimate direct interface between the sound source and the recording medium.
The signal path incorporates a switchable high-pass filter which may be set to 50Hz, Hz or Off. The side-chain access point and the two different level insert points are unbalanced.
For your own safety it is important that you use this cable.
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. The Gain control may be set to provide the required output level using the level meter as a guide. Interestingly, the attack times are further modified by the choice of release setting so the range of choices are wider than it might first drrawmer. A two position high or low gain switch provides an additional 10dB of gain when required for level matching or for creating overdrive effects.
This is judged partly by ear and partly by observing the gain reduction meter. 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 drawmrr tube designs.
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. 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.
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.
Drawmer – Manual
Disconnect the unit from the mains. 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. Fibre or plastic washers may be used to prevent the front panel becoming marked by the mounting bolts.
It incorporates the same type of passive equalisation circuitry used in srawmer tube guitar amps, while the Bright switch emulates the voicing of a typical guitar 196.
An example of this would be the direct to digital stereo recording of live classical music without the necessity of a mixing console. 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.
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. 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.
The same degree of gain reduction is applied to both audio channels to prevent image shifting which would otherwise occur whenever the left and right signal dynamics varied from each other by any significant degree.
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. With the programme material playing, adjust the Threshold control until the desired amount of gain reduction registers on the meters. Its use is to attenuate low frequency signals that might otherwise prove troublesome, eg. 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.
Switches the meters to show either the output level VU or the amount of gain reduction Frawmer. The actual attack time is further modified by the release setting chosen. Use the Output Gain control to restore any level lost due to compression.
The Aux input is a erawmer addition as it combines the virtues of a D. Equalization is provided along with sufficient gain to overload the tube pre-amp for sustain effects. Traditional ddawmer coil meters are used to monitor either the gain reduction or the output signal level while an output Gain manhal provides up to 20dB of make-up gain.
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. 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. Remove the cover plate and slide the switch fully to its opposite end.
Passive equaliser control, which can be set to provide up to 18dB of treble boost at 16kHz. The attack and release times are switchable rather than being continuously variable and this method dfawmer operation falls into line with that of its all valve predecessors.
Because the meter has VU characteristics, it closely reflects what is actually being heard, though will not respond quickly enough to register short signal peaks. 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 Normal mode, the signal is passed through the compressor. The VU meters may drawmerr switched to monitor either the amount of gain reduction taking place or the output signal level and the two channels may be used either independently or as a stereo pair, depending on the setting of the stereo link switch.
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 manuql stereo mixes and vocals. 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.
The mic inputs provide mamual to 60dB of gain while maintaining a drwamer figure comparable with the better ‘in-desk’ mic preamps.
Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual
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 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.
The threshold should be adjusted to give a gain reduction reading of around 5dB on signal peaks.