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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Gain The Output level may mannual amplified or attenuated by up to 20dB to compensate for level changes caused by compression and limiting. This rotary switch selects the compressor input source.

For this mnual, it is unwise to use more compression than is strictly necessary. 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.

Remove the cover plate and slide the switch fully to its opposite end. The Gain control may be set to provide the required output level using the level meter as a guide. A two position high or low gain switch provides an additional 10dB of gain when required for level matching or for creating overdrive effects.

DRAWMER 1960 Operator’s Manual

This fully variable control sets the mic input gain over the range 0 to 60dB. Three switchable Attack settings are provided giving Fast, Medium and Slow attack times. 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. The mic inputs provide up to 60dB of gain while maintaining a noise figure comparable with the better ‘in-desk’ mic preamps.

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.

Because the compression system is based on the Soft Knee principle, the onset of compression is progressive, so no Ratio control is necessary. The side-chain access point and the two different level insert points are unbalanced. 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. Its use is to attenuate low frequency signals that might otherwise prove troublesome, eg.


Traditional moving coil meters are used to monitor either the gain reduction or the output signal level while an output Gain control provides up to 20dB of make-up gain.

In Normal mode, the signal is passed through the compressor. Re-connect to mains power source. 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.

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. Strictly speaking, a soft knee design does not have a rigidly defined threshold but the title ‘Threshold’ ddawmer been retained for the “amount of compression” control for the sake of familiarity. 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 19660, but a good starting point is to switch Bright ‘On’ and set the compressor for ‘Med’ attack and ‘6’ release.

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

Because the compressor is a soft knee type, it requires few controls. 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. If more gain reduction appears necessary, it is worth considering applying a conservative degree of compression during recording and then further compression while mixing. The threshold should be adjusted to give a gain reduction reading of around 5dB on signal peaks.

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

A further auxiliary instrument pre-amp with EQ is also provided. The actual attack time is further modified by the release setting chosen. Avoid running at excessively high output levels as this reduces the available amount of signal headroom and could lead to distortion in extreme cases. Adds 10dB of gain in the High position.

Avoid mounting the deawmer directly above power amplifiers or power supplies that radiate significant amounts of heat and always connect the mains earth to the unit. 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.


If necessary, change the Attack and Release settings to suit the material. For your own safety it is important that you use this cable.

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. Disconnect the unit from the mains. There are four fixed Release times and drawemr further two which are programme dependent.

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. 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. 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.

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.

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. Averages the left and right channel control settings when the unit is used for processing a stereo signal. Attack simply offers a choice of slow, medium and fast whilst release has six settings.

Combining eight active tube stages and the low noise and reliability mmanual solid state electronics, the Drawmer provides the ultimate direct interface between the sound source and the manuql medium.

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