Greg Hanks Design BA-660 Operation And Service Manual
GREG HANKS DESIGN
Issue
1
Operation and Service Manual
BA-660
CONSCIENTIOUS AUDIO DESIGN AND MANUFACTURE
Use and Care of your Mic Pre/limiter
Greg Hanks Design
35 Hardscrabble Hill Rd.
Chappaqua, New York 10514-3009
(914) 238-4172 FAX (914) 242-0282
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 - 200µs 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
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
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
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Suggestions for Safety
WATER AND MOISTURE - - Do not use
the unit near any source of water or in
excessively moist environments
O
BJECT AND LIQUID ENTRY - - Care
should be taken so that objects do not
fall and liquids are not spilled into the
enclosure through openings
V
ENTILATION - - When installing the unit
in a rack or any other location, be sure
there is adequate ventilation..
H
EAT - - The unit should be situated away
from heat sources such as radiators,
heat registers, stoves or other units
that produce heat.
P
OWER SOURCES - - Care must be taken
to ensure that the unit is only
connected for voltage that is selected
via the internal selector(s).
P
OWER CORD PROTECTION - - AC
power supply cords should be routed
so that they are not likely to be walked
on or pinched by items placed upon
or against them, paying particular
attention to cords at plugs,
convenience receptacles and the point
where they exit from the unit. Never
take hold of the plug or cord of your
hand is wet and always grasp the plug
body when connecting or
disconnecting it.
G
ROUNDING OF THE PLUG - - This unit
is equipped with a 3-wire grounding
type plug, a plug having a third
(grounding) pin. This plug will only
fit into a grounding type power
outlet.
This is a safety feature. If you are
unable to insert the plug into the
outlet, contact your electrician to
replace your 2 pin receptacle. Do not
defeat the purpose of this groundingtype plug by removing the grounding
pin.
ARTS AND STANDS - - The unit is heavy,
C
and made with delicate components
and as such should only be used with
racks and stands recommended by the
manufacturer. The unit and cart
combination should be moved with
care. Quick stops, excessive force and
uneven surfaces may cause the unit
and cart combination to overturn.
W
ALL OR CEILING MOUNTING. - - The
unit should be mounted to a wall or
ceiling only as recommended by the
manual.
C
LEANING - - The unit should be cleaned
only as recommended by the
manufacturer.
N
ON USE PERIODS - - The AC power
supply cord should be removed from
the unit when left unused for a long
period of time.
D
AMAGE REQUIRING SERVICE - - The unit
should be serviced by qualified service
personnel when;
A) The AC Power supply cord or the
plug has been damaged; or
B) Objects have fallen into the unit;
or
C) The unit has been exposed to rain
or liquids have been spilled into
the unit or
D) The unit has been exposed to
thermonuclear explosion; or
BA660.doc 01/01/97 2 of 25
E) The unit does not appear to
operate normally or exhibits
marked change in performance; or
A
Specifications
F) The unit has been dropped or
the enclosure exhibits
significant damage.
• Gain:
Mic In
>+97 db max.
<-20 db min.
Line In
> +34 db max.
< -10 db min.
• Input Impedance (20 Hz - 20 Khz)
Mic = 1k3
Line > 20K Ω
Insert Return > 100 K Ω
Side Chain Insert > 220KΩ
Ω
• Frequency Response
Mic In - 6 Hz - 60 Khz +0, -3
Line In -6 Hz ->60 Khz+0/-1
• Attack Time - 200µs to 150 ms
• Release Time - 15 ms - 6 sec
• Ratio range
1.2:1 - > 20:1
• Range of limiting
≥ 18db
• Maximum Input Level
Mic In
@ +14 > + 45 dbm
@ -15 > +25 dbm
Line In > +40 dbm
• Maximum output level
> +34 dbv ref. 600
150
Ω
Ω into
• Harmonic Distortion
< .6% at all levels up to +34
dbm
• • S/N Ratio
> 120 db
• • Output Impedance
Line Out (20-20Khz)
100
50
Insert Send < 100
Ω balanced
Ω unbalanced
Ω
• Phantom Voltage nom. +48VDC
(Internally adjustable to +300 VDC @
5 ma.)
BA660.doc 01/01/97 3 of 25
• IM Distortion
< .1% at all levels up to +34
dbm
• Pin conventions:
XLR connectors are wired as
follows;
Pin 1 = Shield
Pin 2 = Signal Plus +
Pin 3 = Signal Minus -
All 1/4" connections are TRS,
and are wired as follows;
Tip = Signal Plus +
Ring = Signal Minus -
…CUT TO THE CHASE…!!…CUT TO THE CHASE…!!
Microphone use
• Plug the mic into the unit
• Set the input selector to -45
• Monitor the input, (Push monitor select button "IN")
• Set the input selector and trim so that the average signal is around the yellow
led.
• Set the Threshold control for desired limiting.
• Set the attack, release and ratio controls to 12:00
• Monitor the output signal, (Put the monitor select button in the "Out"
position)
Sleeve = Shield/Chassis
• Set the output gain makeup control for around the yellow LED.
Line level use
• Plug the Line level signal into the input of the BA-660.
• Set the monitor selector switch to the input (in) position
• Set the input selector and trim controls so that the signal is lighting the the
Yellow on the peaks.
• Set the input selector and trim so that the average signal is around the yellow
led.
• Set the Threshold control for desired limiting.
• Set the attack, release and ratio controls to 12:00
• Monitor the output signal, (Put the monitor select button in the "Out"
position)
• Set the output gain makeup control for around the yellow LED.
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