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QES Labs VARIABLE GM Owner's Manual

Stereo vacuum tube compressor
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VARIABLE GM
Stereo Vacuum Tube Compressor
Rev. 4 – Aug. 9, 2017.
OWNER'S MANUAL
1

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Summary of Contents for QES Labs VARIABLE GM

  • Page 1 VARIABLE GM Stereo Vacuum Tube Compressor Rev. 4 – Aug. 9, 2017. OWNER’S MANUAL...
  • Page 2 This will ensure your tube unit will not over heat. Overheating will cause damage to the tubes and shorten their life span. QES Labs reserves the right to make improvements or changes to it’s products at any time, without notice.

  • Page 3: Location And Ventilation

    LOCATION AND VENTILATION The Variable Gm Compressor must be installed in a stable location with ample ventilation. It is strongly recommended, when rackmounting this unit, that you allow enough clearance on the top and bottom of the unit such that a constant air flow is allowed.

  • Page 4: Operation

    1. OPERATION Connect the unit before switching it on. Make sure that all of the external connectors are plugged into the Variable Gm sockets, then switch the unit on. Power up the unit and allow it enough time to stabilize before using. It usually takes 30 minutes to 1 hour before everything has stabilized and for the unit to warm up and sound at its best.
  • Page 5 2. FUNCTIONS From left to right, the first stage of the Variable Gm is the Remote cut-off preamp. The available controls are: a) INPUT It is a continuously variable pad which levels the incoming audio signal from the Input XLR connector located at the back panel. In conjunction with the OUTPUT control, it imparts the colour of the compression.

  • Page 6: Stereo Link

    - 4 – RELEASE It’s an 11 position selector. Timing indications indicate the first time constant (63% of final value) of the time the compression action ceases. It is expressed in seconds. THRESHOLD This potentiometer (or 24-step rotary switch for the mastering version) indicates at which level the peak reduction action starts.
  • Page 7 3. MEASUREMENTS Noise floor...

  • Page 11: Technical Specifications

    TECHNICAL SPECIFICATIONS: Frequency response (+0/-0.5dB): Channel Out (14 dB gain): 10 Hz – 20 KHz 5 Hz – 40 kHz (-3 dB) Signal to noise ratio (unweighted,50Ω source Z, 10Kohm load, ref. +24dBu): Greater or equal to 98dB, 20Hz-20KHz Common Mode Rejection Ratio (C.M.R.R.) ref. 1KHz, 14dB gain: 70dB.

  • Page 12: Declaration Of Conformity

    DECLARATION OF CONFORMITY I declare that the model “Variable Gm” conforms to the following standards adopted by the European Community: EMC (electro magnetic compatibility) 89/336/CEE directive LV (low voltage equipment) 73/23/CEE directive on electrical safety (EN61010) and electromagnetic compatibility (EN61000).

  • Page 13: Warranty

    This warranty is provided by the dealer where the unit was purchased, and by QES Labs. In case of a valid warranty claim, buyer’s sole and exclusive remedy and QES entire liability under any theory of liability will be, at its option, to repair or replace the product without charge, or, if not possible, to refund the purchase price.

  • Page 14: Recall Sheet

    RECALL SHEET SESSION:___________________________________________________ SONG: ___________________________________________________ PRODUCTION:________________________________________________ ARTIST: ____________________________________________________ ALBUM: ____________________________________________________ SOUND ENG.:_________________________________________________ SETTINGS FOR:_______________________________________________...

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