Radial Engineering Twin-Servo User's Guide
®
True to the Music
Jensen Twin-Servo
500 Series Module
Made in Canada
OUTPUT LEVEL-VU
dB
-6
-12 -9
15
12
9
SERVO
-
I
I
I
+12+18
+3
+6
0
+9
-3
28dB
35
22
I
I
I
42
I
I
48
I
56
I
I
6
60
180º
HPF
PAD
48V
OMNIPORT: INSTRUMENT INPUT
500
™
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
www.radialeng.com
Radial
990
opamp
JENSEN TWIN
User Guide
Radial® Jensen Twin-Servo 500™ User Guide
Table of Contents Page
Feature Set .................................................................... 1
Overview ........................................................................ 2
Making Connections ....................................................... 3
The Control Panel .......................................................... 4
Ground Lift and Omniport ............................................... 5
Applications .................................................................... 6
Block Diagram ................................................................ 7
Specications ................................................................. 8
Warranty ............................................................Back cover
Thank you for purchasing the Jensen Twin-Servo 500™
series mic preamp. We are condent that as you become
familiar with and gain experience using this device, you will
quickly nd that it is an exceptional sounding preamp for
any application.
Although the Twin-Servo 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 nd 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 light on various subjects. If
afterwards you still do not nd the appropriate answer, feel
free to send us an email and we will do our very best to
answer in short order.
Now get ready to plug into what may well be the most
transparent and detailed sounding mic preamplier you
have ever heard.
®
FEATURE SET
1. 10 SEGMENT METER: Custom designed cir-
cuit for greater VU meter accuracy.
2. GAIN CONTROL: Dual gang pot simultaneously controls the dual 990 op-amp topology
for optimal gain at all settings. Stepped attenuation allows for easy recall of settings.
3. 180°: Reverses pins-2 and 3 at the output to
help phase align microphones when two channels are in stereo use.
4. HIGH PASS FILTER (HPF): Gentle high-pass
lter 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 capacitors.
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% distortion at 20Hz.
True to the Music
Made in Canada
OUTPUT LEVEL-VU
dB
-6
-12 -9
+3
+6
0
+9
-3
28dB
35
22
I
I
I
15
I
I
12
I
9
SERVO
-
990
JENSEN TWIN
I
6
60
180º
HPF
PAD
48V
Radial
opamp
9
12
I
+12+18
42
I
I
48
I
56
OMNIPORT: INSTRUMENT INPUT
10 11
1
2
3
4
5
6
7
8
Radial Engineering Ltd.
1
Jensen Twin-Servo 500™ Module
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