BA660.doc
01/01/97
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Table of Contents
TABLE OF CONTENTS ..................................... I
SUGGESTIONS FOR SAFETY ......................... 2
SPECIFICATIONS.............................................. 3
Gain:.............................................................. 3
Input Impedance (20 Hz - 20 Khz) ................. 3
Frequency Response ...................................... 3
S/N Ratio ....................................................... 3
Output Impedance ......................................... 3
Phantom Voltage nom. +48VDC (Internally
adjustable to +300 VDC @ 5 ma.).................. 3
Attack Time - 200
µ
s to 150 ms....................... 3
Release Time - 15 ms - 6 sec .......................... 3
Ratio range..................................................... 3
Range of limiting ........................................... 3
Maximum Input Level ................................... 3
Maximum output level ................................... 3
Harmonic Distortion...................................... 3
IM Distortion ................................................. 3
Pin conventions: ............................................ 3
OVERVIEW I/O CONNECTIONS .................... 6
MIC In............................................................ 6
Line In............................................................ 6
Insert Send ..................................................... 6
Insert Return .................................................. 8
Side chain input.............................................. 8
Side Chain Couple.......................................... 8
Line Output .................................................... 8
Chassis Gnd (Green Post)............................... 8
Signal Gnd ..................................................... 8
Power Input .................................................... 9
CONTROLS: FRONT PANEL ........................ 9
+48 V ............................................................10
Input Selector ...............................................10
Input overload LED ......................................10
Insert Bypass.................................................10
Input trim......................................................10
Phase reverse ................................................10
Meter zero .....................................................11
Limiter Tip In ...............................................11
Input meter select ..........................................11
Gain Reduction bypass ..................................11
Preset/Manual ...............................................11
Threshold ......................................................11
Gain Cell Clip ...............................................12
Attack Time ...................................................12
Release Time .................................................12
Ratio .............................................................12
Output gain ...................................................12
Power switch .................................................13
OVERVIEW OF OPERATION.........................13
INSTALLATION CONSIDERATIONS ............15
Shields and signal grounding ..........................15
Rear Panel Ground connections ......................16
Input and Output balance ................................16
THEORY OF OPERATION..............................17
SUMMARY OF HOW TO FOLLOW THE
DIAGRAMS. .............................................18
Basic tube operation......................................18
Gain Settings .................................................18
System Gain Structure Control ......................19
Insert Sends and Returns ...............................19
Level Meter ...................................................19
Gain Cell.......................................................20
Gain Cell Control..........................................21
PRESETS.......................................................21
Output Stage..................................................21
WARRANTY......................................................22
