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8
676
The Preamp Section
PE AK
EQ
ENAB LE
COMP/LIM
ENAB LE
NAR ROW
CO NTOU R
SI DE CHAIN
EN ABL E
OVE REASY
DI GI TAL
OUTPUT
POW ER
|
20d B
PAD+4 8V
POLARITY
IN VER T
80 Hz
LOW C UT
+
0
–
PEAK
LI MIT
GAIN
dB
+55
+25 +50
+40
-
∞
POST TUBE
ATTE NUATION
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
LI MITE R
dBu
RED: 96kHz
GREEN: 48kHz
YELLOW: 44�1 kHz
-4
+2 +18
+10
OFF
TH RESHOLD
dB
-40
0
+20
-10
-20
-30 +10
RATI O
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
CLASS “A” VACUUM TUBE WITH H IG H VOLTAG E GAIN
METE R SE LECTI ON
IN PUT OUTP UT G�R�
FR EQ
Hz
1k
100 8k
200 2k
1 2 3
987654
1. Gain Control
This control adjusts the amount of input gain applied to the preamp and how hard the tube 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 tube is driven into saturation, or when the circuit post the Preamp/EQ is approaching or has
been driven into clipping (the LED will begin to light around 3 dB before the onset of clipping). With the POST TUBE
ATTENUATION
control fully lowered, this LED can be used to indicate the onset of tube saturation. If this LED only lights
when raising the POST TUBE ATTENUATION control or engaging the EQ, the POST TUBE ATTENUATION control should
be lowered as clipping the analog circuit post the preamp/EQ will not yield desirable sonic results. See ‘Quick Start’
on page 5 for more information on referencing this LED when setting up the 676. See ‘Block Diagram’ on
page 23 for a visual representation of the locations in the signal path where this LED references the signal.
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, set this control near the 12 o’ clock position and use lower GAIN control
settings. For warmer 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/disables +48 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.
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