The here has no potted black box, only a bunch of TL and which don´t appear in the schematic I have (with the black box). Download Drawmer Drawmer mic pre & compressor ✅ Professional audio systems service manuals and repai information. Drawmer mic pre & : Full Text Matches – Check >> Voroshilov- jpg, , Schematic diagram OLDEST bulgarians doorphone.

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

Re-connect to mains power source.

Classic Schematics

If more gain reduction appears necessary, it is worth considering applying a conservative degree of compression during recording and then further compression while mixing. I have had many on the bench that had dirty pots.

Not a good design practice with non-precision opamps and carbon pots. Rotate the cover plate one half turn, and refit the two screws. This rotary switch selects the compressor input source.

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

The passive Dramer and Treble controls are based on those used in dtawmer 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. And definitely recap if original caps! I have the schematics and have been tracing through the unit, but haven’t found anything to lead me in the right direction. As an instrument amplifier, the provides gain, EQ and compression making it ideal for DI’ing guitars, basses and even keyboards.


Johan on May 29, That’s the only thing I’ve heard about, and experienced.

By adding compression to an overdriven sound, drwwmer degree of sustain can be maintained at a lower overdrive setting while the tube circuitry will add warmth and punch. 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.

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

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. 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.

Phantom power is individually switchable on the two channels and a peak overload LED warns when clipping is imminent. 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.

Has anyone had any experience tech-ing one of these units?

The Aux input is a wchematic addition as it combines the virtues of a D. Determines the input level above which gain reduction will be applied and may be set in the range dB to infinity. 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.


Tubefreak Member Netherlands Posts: Re valved it and problem cured for a short while before fault reappeared. Balanced operation is recommended. 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. The signal path incorporates a switchable high-pass filter which may be set to 50Hz, Hz or Off. Averages the left and right channel control settings when the unit is used for processing a stereo signal.

Now to contact Drawmer, thanks for your help.

June 10, I concluded that the sidechain return on the faulty unit was acting like an ariel and this was causing oscillations around the valve stages. Disconnect the unit from the mains. 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.

Harpo Member Rahden, Germany Posts: For mono use, each channel may be considered as being completely independent and set up accordingly.