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Summary of Contents for Sebatron THORAX
- Page 1 ~Sebatron~ Innovative Australian Audio THORAX - operating manual Copyright Sebatron 2020...
- Page 2 Table of Contents: THORAX Valve Microphone Preamplifier with EQ and Compressor 1/Introduction 2/Features 3/Functions and Dials 4/Inputs and Outputs 5/Operation 6/General Maintenance 7/Specifications...
- Page 3 For recording signals direct from electric instruments such as synthesizer, electric guitars, Bass etc. the Thorax is also well suited as a valve D.I with the Direct Input on the front panel. This is a High Impedance direct feed to the grid of the valve and when levels are optimised will yied an excellent signal to noise ratio that is perfectly suited to digital recording.
- Page 4 2. Features...
- Page 5 • Output level control for transparent control of the final output signal Thorax compressor • Fully balanced XLR inputs and outputs • Switchable from Thorax mic pre or external line input • Compressor ‘mix’ control adjustable from 100% dry to 100% wet • Fully variable Threshold, Ratio, Attack, Release controls •...
- Page 6 3. Functions and Dials (top row) -Phantom Power Switch: Switchable +48V power for condenser microphones -Signal LED: Illuminates when signal is present and in optimum range -Pre-amp output control: Adjusts final output level of preamp section -Normal/Reversed Phase Switch: Selects the phase or polarity of the signal -Passive EQ High Selector: Six position selector switch for High Frequency cut or boost (bottom row)
- Page 7 3. Functions and Dials (top row) -Compression indicator LEDs: Indicates when compression is active -Threshold: Sets the point at which compression begins -Ratio: Adjusts the amount of compression when compression begins -Normal/Pump Switch: Selects between normal and pump modes- Pump mode extends ratio range -Attack: Adjusts attack constant of compression characteristics -Release: Adjusts release constant of compression characteristics -Normal/Tight/Swim: Switches between three attack/release ranges...
- Page 8 4. Inputs and Outputs Compressor Input/Output Preamp Input/Output Balanced XLR Balanced XLR Ext. CV input Balanced TRS Side-Chain Insert Balanced TRS Main Audio Ouput Preamp Output All XLR inputs and outputs are pin 2 hot. All TRS outputs are Tip=hot, Ring=cold, Sleeve=Ground. Ext.
- Page 9 4. Inputs and Outputs Mains Power Input Voltage Selector Switch The Thorax can be switched between different voltages via the voltage mains selector on the back of the unit. This switch is usually set in the factory for the appropriate voltage that the unit is destined for, however, in cases of re-sale etc.
- Page 10 1./Set comp mix dial to 100% or fully right, set to feedforward, threshold fully right, ratio to mid-way or 4:1, attack and release mid-way and range selector to tight. Select which input source you are feeding the compressor - Thorax mic pre or external line input on back.
- Page 11 3./ Adjust pad/gain selector for more or less colour and adjust pre-out level control for optimum reading on VU meter. Linking two Thorax’s together for Stereo Compression: *IMPORTANT: If using two Thorax units for compression via external link both units must be factory matched for the compression to be accurate and symmetrical.
- Page 12 3 to 5 minutes. General Use: The Thorax preamp comes stocked with brand new J.J valves. We use J.J valves because of low microphony, consistency and of course the sound which is generally regarded as neutral.
- Page 13 Modular P.C.B: Preamp for easy servicing and modifications Topology: Discrete and Class A Valve and Solid State signal path running on +300V and +60V rails respectively Circuitry: Class A Discrete and low noise Two Dual Triode 12AT7/ecc81 and High Voltage Silicon Transistors Service/Repair queries: sebatron@sebatron.com...
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