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Summary of Contents for Sebatron VMPDualPlus
- Page 1 ~Sebatron~ Innovative Australian Audio VMPDualPlus - operating manual Copyright Sebatron 2021...
- Page 2 Table of Contents: VMPDualPlus Valve Microphone Preamplifier with EQ 1/Introduction 2/Features 3/Functions and Dials 4/Inputs and Outputs 5/Operation 6/General Maintenance 7/Specifications...
- Page 3 Microphone Preamplifier and Direct Input with a basic passive two band shelving Equalizer on each channel. As its name suggests the VMPDualPlus is a part of the Sebatron VMP series of Valve Microphone Preamplifiers. Like its four channel counterpart, the VMPQuadPlus, the VMPDualPlus is based around a transformer-coupled microphone input and 12AT7 valve triode combination running on a proper high tension voltage rail.
- Page 4 2. Features...
- Page 5 2. Features VMPDualPlus preamp • Transformer balanced XLR input feeding 12AT7 dual triode valve • High Impedance unbalanced phono Direct Input for Guitar, Bass, Keyboards or line level signals etc. on front panel for easy access • Balanced phono TRS outputs for independent monitoring •...
- 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 out: Adjusts final output level of preamp -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 Pad/Gain The Pad/Gain selector has been designed to be used in conjunction with the pre-amp out control to achieve the optimum recording level. As the dial is turned to the right the signal increments by 6db and the flow to the valve is increased allowing the onset of a mild harmonic distortion.
- Page 8 4. Inputs and Outputs Channel 2 Output/Input Channel 1 Output/Input Balanced XLR Balanced XLR Balanced TRS Balanced TRS Channel 2 Output Channel 1 Output All XLR inputs and outputs are pin 1=shield, pin 2=hot (+), pin 3=cold (-). All TRS outputs are Tip=hot, Ring=cold, Sleeve=ground/shield.
- Page 9 Mains Power Input Voltage Selector Switch The VMPDualPlus can be switched between different global mains 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 resale etc.
- Page 10 5./ Adjust pre-amp output level to achieve optimum signal level. Adjust equalization controls to taste. Running pre-recorded tracks through the VMPDualPlus mic pre for colour: Signals can be injected into either the XLR on the back or the Direct Input.
- Page 11 2 to 4 minutes. General Use: The VMPDualPlus 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 12 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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