8
676
TU B E M I C
CHAN N E L STR I P
The Preamp Section
PEAK
EQ
ENABLE
COMP/LIM
ENABLE
NARROW
CONTOUR
SIDECHAIN
ENABLE
OVEREASY
DIGITAL
OUTPUT
POWER
|
20dB
PAD
+48V
POLARITY
INVERT
80 Hz
LOW CUT
+
0
–
PEAK
LIMIT
GAIN
dB
+55
+25
+50
+40
-
∞
POST TUBE
ATTENUATION
dB
-
∞
0
-30
-5
-15
LOW
dB
-15
+15
0
MID
dB
-15
+15
0
HIGH
dB
-15
+15
0
AUTO
RELEASE
dB/sec
4k
10
400
1.5k
70
ATTACK
dB/msec
400
80
200
10
1
LIMITER
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44.1 kHz
-4
+2
+18
+10
OFF
THRESHOLD
dB
-40
0
+20
-10
-20
-30
+10
RATIO
1:1
∞
:1
1.5:1
3:1
2:1
1.2:1
8:1
MAKEUP
GAIN
dB
-20
+20
0
-10
+10
INSTRUMENT INPUT
ENABLE
CLA
S
S
“A
”
V
A
C
UU
M
T
U
B
E WI
T
H
H
IG
H
V
O
LT
A
G
E
G
A
IN
METER SELECTION
INPUT
OUTPUT
G.R.
FREQ
Hz
1k
100
8k
200
2k
1
2 3
9
8
7
6
5
4
1. Gain Control
This control adjusts the amount of input gain applied to the preamp and how hard the tubes will be driven. Use lower
values to achieve a cleaner, more transparent sound. Use higher values for tones with more analog warmth, harmonics,
and sheen.
2. Peak LED
This LED lights when the input circuit is driven into clipping. Turn down the POST TUBE ATTENUATION control if this
LED begins to light.
3. Post Tube Attenuation Control
This control adjusts the amount of attenuation applied post the tube preamplifier and is meant to be used in conjunction
with the GAIN control. For cleaner tones, leave this control fully clockwise and raise the GAIN control until the desired
level is achieved. For richer tones, lower this control and raise the GAIN control.
4. Instrument Input Enable Button
This button enables/disables the INSTRUMENT INPUT. When enabled, the signal connected to the INSTRUMENT
INPUT will be passed through the 676. When disabled, the 676 will pass the audio from the MIC INPUT connector
located on the back panel.
5. Instrument Input Connector
Connect an electric guitar or bass directly to this unbalanced, Hi-Z input.
6. +48V Button
This button enables/di48 volt phantom power. Enable it for condenser microphones which require an external
power source. Leave this button disabled when connecting a dynamic or ribbon microphone, or a condenser microphone
which is powered internally or using its own dedicated power supply.
7. 20dB Pad Button
Engage this button to attenuate the input signal by 20 dB. Use it to prevent the MIC INPUT from being overdriven by
loud source signals or high-output microphones.
8. Polarity Invert Button
When enabled, this button inverts the polarity of the MIC INPUT signal. Use it with multi-miked applications where
polarity inversion is required to match the polarity of the MIC INPUT signal with another miked signal – for example,
when using top and bottom mics on a snare drum.