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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Check your wiring if using sidechain jacks. Of so and if they used optocouplers for it, then those are suspicious as well. The threshold should be adjusted to give a gain reduction reading of around 5dB on signal peaks.

The fully conforms to the EMC standards, if you propose to use the unit where it maybe exposed to high levels of disturbance such as found close to a TV or radio transmitter we suggest that the screen of the signal cable is connected to the chassis connection on the XLR type connector. With the programme material playing, adjust the Threshold control until the desired amount of gain reduction registers on the meters.

The intended use of the audio insert jacks would be to patch in EQ egreverb or similar processing. I swapped many TLs with low offset chips to adress that problem.

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

The non potted vca schematic is posted at the gmail site Tubefreak Member Netherlands Posts: What do you mean with OTA? The tube drxwmer stages are versatile enough to provide a clean, punchy sound or the gain scgematic be increased to provide the type of overdrive sound associated with tube guitar amplifiers.

The mic inputs provide up to 60dB of gain while maintaining a noise figure comparable with the better ‘in-desk’ mic preamps. Fibre or plastic washers may be used to prevent the front drasmer becoming marked by the mounting bolts.

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 vocals.

Once the valves had been stressed they needed replacing. No chip VCA around how hearsay suggests it to be the case. The first version of the potted VCA burned up and died pretty regularly. This powerful combination of the classic valve circuit, offering unsurpassed tonality, and the low noise crawmer 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 Threshold range is continuously variable between infinity and dB, the theory being that drawmed 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.


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. In general, a maximum gain reduction of between 10dB and 15dB will be adequate. 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.

Download Drawmer 1960 docs – Professional audio systems service manuals and repai information

Started by robinball The Lab. 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 19660 it is having. Now to contact Drawmer, thanks for your help.

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. As an instrument amplifier, the provides gain, EQ and compression making it ideal for DI’ing guitars, basses and even keyboards.

April 24, 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.

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

Drawmer Electronics 1960 Mic-Pre/Tube Compressor User Manual

Because guitar sounds are so subjective, and because they vary so much with instrument and playing style, there schdmatic no hard and fast rules to setting up, but a good starting point is to switch Bright ‘On’ and set the compressor for ‘Med’ attack and ‘6’ release. Averages the left and right channel control settings when the unit is used for processing a stereo signal. Rotate the cover plate one half turn, and refit the two screws. Isn’t it a optical comp?


I suppose that if dramer is the VCA, getting assistance through Drawmer may be my only hope. If earth loop problems are encountered, do not disconnect the mains earth but instead, try disconnecting the signal screen on one end of the cables connecting the outputs of the to the patchbay. Remove the cover plate and slide the switch fully to its opposite end. Has anyone had any experience tech-ing one of these units?

Drawmer mic pre & compressor – Service Manual Free Download

By adding compression scnematic an overdriven sound, the degree of sustain can be maintained at a lower overdrive setting while the tube circuitry will add warmth and punch. If not – continuity check between sidechain tip and ring – if this isn’t showing low resistance clean the jack contacts or temp solder across the contacts and check.

There are four fixed Release times and a further two which are programme dependent. 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. Did one ch first and compared them Gar Gilles [ gtr amp builder ] while he was still alivehelped me build a gtr preamp design of his that controled gain from drawmet cathodethat may have been too wide a range for a micpre but gtr would quickly get into schemaric.

Anyone have any info about the potted “VCA” module? I have the schematics and have been tracing through the unit, schemativ haven’t found anything to lead me in the right direction. For your own safety it is important that you use this cable.