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 VU meters may be 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.
Because the compressor is a soft knee type, it requires few controls. A two position high or low gain switch provides an additional 10dB of gain when required for level matching or for creating overdrive effects. 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.
Gain The Output level may be amplified or attenuated by up to 20dB to dtawmer for level changes caused by compression and limiting. With the programme material playing, adjust the Threshold control until drawme desired amount of gain reduction registers on the meters.
Passive equaliser control, which can be set to provide up to 15dB of bass boost at 40Hz. 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.
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.
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. 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.
Switchable Attack and Release settings are provided along with a fully variable Threshold, two of the Release settings being programme dependent.
DRAWMER 1960 Operator’s Manual
Determines the input level above which gain reduction will be applied and may be set in the range dB to infinity. If more gain reduction appears necessary, it is worth darwmer applying a conservative degree of compression during recording and then further compression while mixing.
The passive Bass and Treble controls are based on 9160 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. 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.
Select the appropriate signal source for each channel using the selector switch. Disconnect the unit from the mains. 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. The signal path incorporates a switchable high-pass filter which may be set to 50Hz, Hz or Off.
There are four fixed Release times and a further two which are programme dependent. 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.
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. The side-chain access point and the two different level insert points are unbalanced.
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. 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 side chain access points may be used to patch in equalisers to enable the compressor to act as a de-esser.
Drawmer Electronics Mic-Pre/Tube Compressor User Manual | 13 pages
Because the tube circuitry generates more heat than an equivalent solid-state design, it is advisable to leave space rrawmer the unit to allow the heat to dissipate. 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.
The Gain control may be set to provide the required output level using the level meter as a guide.
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. Replace with a correctly rated fuse for the selected operation voltage.
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. 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.