6
UM TGMC-120117
proximate gain required. With Coarse Gain set, then adjust
the Fine Gain control to trim the overall input +/-10 dB as
needed.
Tip:
Fine Gain can be used as a great way to dial-in pre-am-
plifier coloration; experiment by sweeping across the control
range while listening to the results.
Historical note:
The separate switched Coarse Gain and
continuous Fine Gain control-set was how gain staging was
achieved on historic TG console Microphone Cassettes.
Rumble Filter
The
Rumble Filter
is a low cut facility, providing an
Out
position
and six frequency settings as follows:
33, 41, 47, 65, 82
and
110
Hz. The Rumble Filter may be fully disengaged from the
pre-amplifier by setting its switch to the
Out
position. When
active, this filter affects source present at the
Pre Amp/EQ
input XLR connector. This filter is useful for removing un-
wanted low frequency information from the source.
Tip:
More than simply a low cut or high pass, the Rumble
Filter has an effect on the overall signal and can be used as a
powerful tone control.
Historical note:
The original Rumble Filter was available
on historic REDD.51 valve consoles, and activated via a plug-
in jumper. The Rumble Filter was fixed at 30 Hz, and was
unique in its circuit design.
TG2
The
TG2
section of the TG Microphone Cassette is adapted
from Chandler Limited’s TG2 Pre Amp/DI, an historic rec-
reation of the rare EMI TG12428 amplifier employed in the
EMI mixing and mastering consoles of the late ‘60s and ‘70s.
Coarse Gain
This rotary switch provides 9 steps of input gain of, 5 dB
each, offering a selectable range between
+20
dB and
+60
dB. Use the
Coarse Gain
control to set the initial input gain of
the pre-amplifier section.
Fine Gain
This control provides continuous gain trim of +/-10 dB; used
in conjunction with Coarse Gain, a maximum of +70 dB gain
may be achieved.
When gain staging, begin with the
Fine Gain
control set to
middle (
0
), and adjust the Coarse Gain control to the ap-
48v
DI
LINE
PHASE
COARSE GAIN
FINE GAIN
RUMBLE FILTER
-8
-6
-4
-2
0
+2
+4
-10
+6
+8
+10
OUT
33
41
47
65
82
110
®
+30
+35
+40
+45
+50
+25
+56
+20
+60
48v
DI
LINE
PHASE
COARSE GAIN
FINE GAIN
RUMBLE FILTER
-8
-6
-4
-2
0
+2
+4
-10
+6
+8
+10
OUT
33
41
47
65
82
110
®
+30
+35
+40
+45
+50
+25
+56
+20
+60
48v
DI
LINE
PHASE
COARSE GAIN
FINE GAIN
RUMBLE FILTER
-8
-6
-4
-2
0
+2
+4
-10
+6
+8
+10
OUT
33
41
47
65
82
110
®
+30
+35
+40
+45
+50
+25
+56
+20
+60
48v
DI
LINE
PHASE
COARSE GAIN
RUMBLE FILTER
OUT
33
41
47
65
82
110
®
