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Radial Engineering Ltd.

Jensen Twin-Servo 500

 Module

True to the Music

®

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FeaTure SeT

1.

 

10 SeGMeNT MeTer: 

Custom designed cir-

cuit for greater VU meter accuracy. 

2.

 

GaiN CoNTrol:

 Dual gang pot simultane-

ously controls the dual 990 op-amp topology 

for optimal gain at all settings.

3.

 

180°: 

Reverses pins-2 and 3 at the output to 

help phase align microphones when two chan-

nels are in stereo use. 

4.

 

HiGH PaSS FilTer (HPF):

 Gentle high-pass 

filter  may  be  inserted  into  the  signal  path  to 

reduce excessive low frequency content and 

control resonance. 

5.

 

PaD:

  Reduces  the  input  sensitivity  by  -15dB 

when amplifying exceedingly high output 

sources. 

6. 48V:

 Activates the 48V phantom power supply 

for use with condenser microphones and ac-

tive direct boxes.  

7. CoMBo iNPuT:

  Combination  balanced  XLR 

mic input and 1/4” instrument input is mounted 

on front panel for ease of use.

8.

 

oMNiPorT:

  Available  when  used  with  the 

Radial Workhorse, the Omniport accesses a 

hi-Z instrument input.

9.

 

JeNSeN Dual 990 oPaMPS:

 100% discrete 

audio signal path without any tone shifting  ca-

pacitors.

10.

 

JeNSeN ouTPuT TraNSForMer:

 The JT-

11-EM is linear from 2Hz~200kHz with less 

than 0.001% distortion at 20Hz.

11.

 

GrouND liFT:

 Set and forget rear panel 

ground switch lifts the pin-1 ground at the XLR 

input.

12.

 

JeNSeN MiC iNPuT TraNSForMer:

 The 

JT-16-PCJR is exceptionally quiet and linear 

from 5Hz~50kHz with less than 0.06% distor-

tion at 20Hz.

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Summary of Contents for Twin-Servo 500 series

Page 1: ...com True to the Music User Guide Jensen Twin Servo 500 500 Series Module Radial Engineering Ltd 1588 Kebet Way Port Coquitlam British Columbia Canada V3C 5M5 Tel 604 942 1001 Fax 604 942 1010 Email info radialeng com ...

Page 2: ......

Page 3: ... has been designed to be super easy to use we urge you to take a few minutes to read the manual to ensure you gain familiarity with all of the features and functions that make it unique If after you have done so you find yourself looking for extra details please visit the Twin Servo FAQ page on the Radial web site This is where we post updates and answer questions from other users that can shed li...

Page 4: ...fying exceedingly high output sources 6 48V Activates the 48V phantom power supply for use with condenser microphones and ac tive direct boxes 7 COMBO Input Combination balanced XLR mic input and 1 4 instrument input is mounted on front panel for ease of use 8 OMNIPORT Available when used with the Radial Workhorse the Omniport accesses a hi Z instrument input 9 JENSEN DUAL 990 OPAMPS 100 discrete ...

Page 5: ...citors and two industry leading Jensen transformers The Twin Servo 500 has been meticulously designed to reproduce Deane Jensen s original Twin Servo 990 mic pre regarded by many audio professionals as the finest preamp ever made The dual JE 990 op amps allow for maximum efficiency and lowest noise at all signal levels while the servos eliminate the need for signal degrading capacitors in the audi...

Page 6: ... the Twin Servo module into place ensuring you align the card edge with the 15 pin receptacle If you have a newer Radial Workhorse the nylon guides make this easy The Twin Servo comes with a pair of handy ThumbSet thumb screws These should be hand tightened to secure the module in place before use Your power rack will likely be equipped with XLR inputs and outputs for each strip Connect your micro...

Page 7: ...Twin Servo actually measures down to 5Hz With so much bass you will hear low end like never before The downside is that with so much bass to work with it may be excessive particularly when recording several acoustic instruments together The solution reduce the resonance and excessive bass by engaging the high pass filter This is one of the most practical features on the Twin Servo When engaged it ...

Page 8: ...ING NOTICE TO USER Although preventative safety measures have been designed into Radial 500 series products we strictly advise against hot swapping modules or plugging and unplugging them when the Workhorse or other 500 series rack are powered on Hot swapping can cause connection sparks at the card edge connector that could send damaging transients to other equipment This also greatly reduces the ...

Page 9: ... as bleed from other instruments can be eliminated Connect a piezo transducer to the Radial PZ DI and send this to the Twin Servo for amazing bottom end Using the Twin Servo with a ribbon mic Most modern ribbon microphones have plenty of output and can connect directly to the Twin Servo s low noise circuitry When using old vintage mics add the Radial McBoost to increase the output by up to 25dB fo...

Page 10: ...Radial Engineering Ltd Jensen Twin Servo 500 Module True to the Music Block Diagram Subject to change without notice 7 ...

Page 11: ...Rejection CMRR 72dB Equivalent Input Noise EIN 120dbu maximum gain Dynamic Range 91dB Total Harmonic Distortion THD N 0 004 Intermodulation Distortion 0 004 Instrument Input Input Impedance Instrument 220kΩ unbalanced Instrument Preamp Gain 60dB unbalanced Control Panel Meter 10 segment peak indicator with hold Polarity Reverse 180º Pad 15dB High Pass Filter 6dB octave 3dB 150Hz Phantom Power 48VD...

Page 12: ...modification by any other than an authorized Radial repair centre THERE ARE NO EXPRESSED WARRANTIES OTHER THAN THOSE ON THE FACE HEREOF AND DESCRIBEDABOVE NO WARRANTIES WHETHER EXPRESSED OR IMPLIED INCLUDING BUT NOT LIMITED TO ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE SHALL EXTEND BEYOND THE RESPECTIVE WARRANTY PERIOD DESCRIBED ABOVE OF THREE YEARS RADIAL SHALL ...

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