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  207 Tube Microphone / Instrument Preamp BROCHURE USER
MANUAL
The 207 is DISCONTINUED and is shown for reference only.
Please see the 207D.

The Model 207 is an audiophile quality tube mic preamp without the high cost usually associated with such products. It will meet or exceed the performance of preamps costing many times more. The Model 207 will reveal the subtlety and power of vintage condensers, ribbons, electrets, and popular dynamic mics. Even the world's most respected microphones will sound better.

The instrument inputs also are quieter and have more gain, than conventional instrument preamps. The MicLim™ circuitry, previously only available in our flagship Model 1100 2 channel and Model 1788 8 channel mic preamps, makes the Model 207 virtually crashproof - making it a perfect front end for digital recorders.

By combining the best traits of tube and solid state circuitry, the Model 207 captures a sound that is warmer, fuller and more true to life. Whether you are recording, mixing live, broadcasting or webcasting, the signal has to travel a long journey before its final delivery. So give your sound a great start with the Aphex Model 207 Tube Mic/Instrument Preamp.

 BENEFITS
Dramatically improves microphone performance Greater dynamic range and frequency response
Dramatically improves instrument performance Fuller, more realistic sound
Improved Detail and Intelligibility Record hotter tracks with the highest possible resolution
Tighter lows; clearer up-front mids; Strong highs without edginess
MicLim™ offers up to a 20dB increase in dynamic range and makes the Model 207 virtually crashproof
 FEATURES
Two independent low noise channels of tube amplification
Microphone and Instrument inputs on each channel
MicLim™ on each channel
Mic Input: 20 to 65dB of continuously variable gain
Instrument Input: -infinity to 65dB of continuously variable gain
Switchable 48 volt Phantom Power with ramp up feature
Delayed Turn On
Polarity, 20 dB pad and Low Cut Filter switches
LED Headroom Meter Display for each channel
Switchable -10 dBv / +4 dBu operating level
Balanced 3-pin and 1/4" TRS Inputs and Outputs

Internal Switch Mode Power Supply

 PROPRIETARY CIRCUITRY

MicLim™ provides up to 20 dB of gain reduction. It is a custom designed optical attenuator, located directly on the mic input line that smoothly limits the microphone's output signal according to the MicLim peak detector's control current. Since attenuation comes prior to preamplification, the patented MicLim can increase the Model 207's effective headroom by up to 20 dB. MicLim detects the preamp's output signal and instructs the input attenuator to proportionately reduce the microphone's output level just enough to prevent clipping. MicLim has no effect at all when the preamp's output level is not approaching clipping.

Reflected Plate Amplifier™ The patented RPA is a true vacuum tube circuit which has all the desired characteristics without the heat, fragility, sonic variability, short life and high frequency roll-off of conventional tube designs.

 OTHER INNOVATIVE FEATURES

Delayed Turn-On - The power LED glows orange while the Tube circuit is stabilized and all DC is eliminated (ensuring no turn on thump which can seriously harm loudspeakers). When the LED turns green the Model 207 is ready for optimum performance.
Switch Mode Power Supply - this internal power supply will automatically adjust to any line voltage making the 207 an excellent choice for touring applications: no switches to throw, no jumpers to remember to set, etc.
 For Recording Microphones and Instruments

The Model 207 will capture the subtleties of voices and instruments that are missed by the inexpensive mic preamps fpund in most audio consoles, DAW's and other standalone preamps. This detail, dimension and space will greatly improve the overall "sound" of your recordings. With this improvement in realism comes an enhanced presence allowing for easier placement in the final mix. For recording instruments a typical mono tube direct box (DI) sells for about the price of a model 207 — and we'll give you two great DI's plus two great mmic preamps, more useful features and Aphex quality all in one box! MicLim allows you to utilize every last bit of digital resolution for the most dynamic recordings possible.

 For Live Sound, Touring PA, and Fixed Installations

The 207 can bring anything miked up out of the mix by greatly improving detail and presence. Vocals and instruments will have a noticeable improvement in clarity and depth when switched to a Model 207. The Switch Mode power supply offers stable performance even with unstable mains voltages. MicLim eliminates those desperate lunges over the mixing desk to trim back overloaded preamps.

 For Broadcasting and Webcasting

Typical Broadcasting and Webcasting chains reduce the clarity and detail of an audio signal. Thie is especially damaging to voice presence and intelligibility. Voices miked through the 207 will better retain their original character and impact. MicLim ensures a strong undistorted sound that will still sound good out of a computer speaker, car radio, or high fidelity system.

 As a "Direct Box"

For bass, acoustic guitar and keyboards the Model 207's low-noise, wide frequency response and tube warmth allow each instrument's unique character to be captured. The MicLim circuit works on the instrument input also, protecting against overload distortion.

 SPECIFICATIONS - Aphex Model 207 - Tube Microphone and Instrument Preamp
AUDIO    
  Frequency Response +0, -0.5dB 30Hz - 30 kHz
  EIN -129dBu (input shorted)
  Crosstalk (10 Hz - 22kHz) -79 dB or better
  THD (10 Hz-22kHz at -11dBfs) < 0.18%
  Tube Type 12AT7 / ECC81 Dual Triode
MIC INPUT IF OPERATING LEVEL SET TO +4 dBu IF SET TO -10dBv (-7.8dBu)
  Connector XLR-3F same
  Type Transformerless, NPN active balanced same
  Balanced 2k ohms nominal same
  Maximum Level 0 dBu +12.5 dBV (+14.8 dBu)
  CMRR Greater than 70dB @ 60 Hz same
  Nominal Preamp Gain 20 to 65dB minus OUTPUT TRIM loss 8 to 53 dB minus OUTPUT TRIM loss
INSTRUMENT INPUT    
  Connector 1/4" Phone Jacks same
  Type Unalanced JFET amp same
  Input Z 1M ohm nominal same
  Maximum Level 10V RMS same
  Nominal Preamp Gain infinity to 65dB minus OUTPUT TRIM loss infinity to 38dB minus OUTPUT TRIM loss
OUTPUT    
  Connector XLR-3M and 1/4" TRS Phone Jacks  
  Type Impedance balanced (may be used unbalanced)
  Output Z Balanced XLR: 66 ohms - TRS: 1200 ohms  
  Output Z Unbalanced XLR: 33 ohms - TRS: 600 ohms  
  Nominal Level +4 dBu -10dBv (316 mVRMS)
  Maximum Level +21dBu Unloaded +6.75 dBV Unloaded
  Output Trim 0 to -12 dB same
INSERT    
  Connector 1/4" TRS Phone Jack  
  Send Tip  
  Return Ring  
  Nominal Operating Level -10dBv (316 mVRMS)  
  Point of Insertion Between front-end and Tube Output Stage
OTHER SPECIFICATIONS
  Power requirements 90-250 VAC 50-60 Hz 12W  
  Dimensions 19"W x 1.75"H x 8.25" D   1 Rack U  (482.6mm x 44.5mm x 209.6mm)
  Depth behind front panel 7.5" (190.5 mm)
  Net Weight 6 lbs (2.73 kg)  
  Shipping Weight 9 lbs (4.1 kg)  
DOWNLOADS: COLOR BROCHURE 358k USER MANUAL
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11068 Randall St.
Sun Valley CA 91352
818-767-2929  Fax: 818-767-2641
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