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John Hardy Co. Jensen Twin Servo 990 Mic Pre 4 Ch -20dB PAD
Professional mic pre utilizing premium Jensen components
The Jensen Twin Servo 990 mic preamp is considered the worlds finest mic preamp by audio experts. It's the ideal integration of advanced design software, hardware, engineering know-how, and carefully controlled 'golden ears' tests. It has earned high marks for sonic performance since its introduction in 1988.
The basic circuit was originally published as an application note by Jensen for their finest microphone input transformer, the JT-16-B. Each channel uses two precision 990C operational amplifiers modules, developed and patented by Jensen, to achieve one tenth the distortion and twice the bandwidth of a single stage design.
The Jensen Twin Servo 990 has a 19" wide mainframe rack-mount chassis (1.75"H x 19"W x 8"D) and can be ordered with 1 to 4 channels. Additional channels can be easily added later up to the total capacity of the mainframe.
JT-16-B - input transformer
Two 990 discrete op-amps per channel - faster, quieter, more powerful and better sounding than typical monolithic op-amp
Elimination of all coupling capacitors from the signal path - results in less degradation of the audio signal
JT-11-BMQ - output transformer
Input bias current compensation circuitry and DC servo circuitry - eliminates signal degrading coupling capacitors
Fully sealed conductive plastic gain control - provides smooth continuos gain adjustments from 16dB to 60dB
20 Ohm mic switch
Polarity reverse switch
Phantom power switch
All front panel switches are LED illuminated
Gold plated XLR connectors - for maximum reliability
Ground lift switch on each channel - helpful for eliminating ground loops
VU-1 - very accurate and informative 20 segment LED meter, with separate peak LED, for monitoring preamp output
Toroidal power transformer with additional shielding - eliminates hum problems so no external power supply is needed
Universal power supply - internal switch provides six primary voltage choices to accommodate use anywhere in the world
Chassis ground isolation switch - helpful for eliminating ground loops
Pin 2 or pin 3 high - internal jumpers make changes in the field easy
Tube or Solid State
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