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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Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

This rotary switch selects the compressor input source. Determines the input level above which gain reduction will be applied and may be set in the range dB to infinity. 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 complete stereo mixes and janual.

Because the meter has VU characteristics, it crawmer reflects what is actually being heard, though will not respond quickly enough to register short signal peaks. Equalization is provided along with sufficient gain to overload the tube pre-amp for sustain effects.

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

DRAWMER 1960 Operator’s Manual

Re-connect to mains power dgawmer. Averages the left and right channel control settings when the unit is used for processing a stereo signal. The adjacent Clip LED illuminates when excessive mic gain has been applied and there is a danger of clipping.

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


For this reason, it is unwise to use more compression than is strictly necessary. The actual attack time is further modified by the release setting chosen. 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. Passive equaliser control, which can be set to provide up to 18dB of treble boost at 16kHz. 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.

Attack simply offers a choice of slow, medium and fast whilst release has six settings. 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. 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.

Drawmer – Manual

Because the tube circuitry generates more heat than an equivalent solid-state design, it is advisable to 1690 space above 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. 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.

Because the compressor is a soft knee type, it requires few controls. Ddrawmer attack and release times are switchable rather than being continuously variable and this method of operation falls into line with that of its all valve predecessors. Balanced operation is recommended.


For use with stereo signals such manuao complete mixes or submixes, the unit should be switched to Stereo Link mode and both sets of channel controls set to the same position.

The unit should always be connected to the mains supply earth using this cable. 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. By increasing the Gain control setting, the input stage can be drasmer to overdrive in drawme manner similar to that of traditional valve guitar amplifiers.

The Aux input is a valuable addition as it combines the virtues of a D. Its use is to attenuate low frequency signals that might otherwise prove troublesome, eg. For mono use, each channel may be considered as being completely independent and set up accordingly. Manuap use of compression on complete drawmerr 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.

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. A further auxiliary instrument pre-amp with EQ is also provided. If more gain reduction appears necessary, it is worth considering applying a conservative degree of compression during recording and then further compression while mixing.

Adds 10dB of gain in the High position.