Avalon VT-747SP - Quick Set-Up Guide

Page 8 Avalon Vt-747sp Operation Manual
AVALON DESIGN
Quick Start-up
TSP
Twin Signal Path
Switch (in) swaps
three (3) tubes
into the audio
path from discrete
Class A amps.
F4 
Boost-cut
sets amplitude
of mid-range
-4dB to +4dB
detent at 0dB
2kHz
peak-dip
FI 
Boost-cut
sets amplitude
of low-bass
-24dB to +24dB
detent at 0dB
15Hz
shelf
F2 
Boost-cut
sets amplitude
of mid-bass
-8dB to +8dB
detent at 0dB
125Hz
peak-dip
F3 
Boost-cut
sets amplitude
of low-mid
-4dB to +4dB
detent at 0dB
500Hz
peak-dip
F5 
Boost-cut
sets amplitude
of presence
-10dB to +10dB
detent at 0dB
5kHz
shelf
F6 
Boost-cut
sets amplitude
of treble
-20dB to +20dB
detent at 0dB
32kHz
shelf
20
10
3
2
AVALON
VACUUM TUBE
-
7
5
3
1
0
1
2
d
e
c
i
b
e
l
s
V
U
+
IN IN IN IN INININ
HF
v
747
sp
t
-
dB+
-15 +15 -15 +15
0dB
+2 +6
+10
SIDE-CHAIN THRESHOLD
CONTOUR
GR
SC LISTENSIDE-CHAIN
CAL
GR
GAIN
+10dB
60
100
80
160 250
300
400
1k
Hz
70 600
200
600
1k
800
1k6 2k5
3k
4k
10k
Hz
700 6k
2k
LF
TSP
EQ COMP
INPUT
0
20 8
32
46 610
11
FAST SLOW
ATTACK
TUBE
SIGNAL
PATH
FAST SLOW
RELEASE
GAIN
MAKE-UP
COMPRESSOR
METER
RATIO
COMPRESSION
120
47
83
102
65
-
dB+
THRESHOLD
20 20
0
6
10
-
10
1615
3+2
DESIGN
AVALON
0
1 2 3 3 2 1
+
-
CLASS A PROGRAM EQUALIZER LEVEL
SIGNAL
-
dB+
OUTPUT
0
20 6
22
34 48
11
EQUALIZER
R
dB
L
30
0
24
18
12
+
-
12
6 6
18 24 30
VT-747SP QUICK SET-UP OPERATING GUIDE
+10dB switch
Boosts input
amplifier by
+10dB for extra
tube over-drive
INPUT GAIN
Trims input level
-20dB to +8dB
detent at 0dB
(+18dB with +10dB IN)
LF and HF THRE
S
H
O
LD
Range -15dB to +15dB, detent at 0dB,
clockwise rotation raises the threshold
(less compression) and counter clockwise
rotation lowers the threshold (more compression)
at the frequencies set by the LF (low frequency)
and HF (high-frequency) spectral frequency
controls located directly below
THRESHOLD
Sets compressor
input threshold
from -30dB to
+20dB
COMPRESSION
Sets ratio of
compressor
from 1:1 to 20:1
COMPRESSOR
Switch (in) engages
compressor into
signal path
(hard-wire bypass)
SIX (6) BAND PASSIVE CLASS A, PROGRAM EQUALIZER
EQ to COMP
Inserts the
six (6) band
EQ pre the
compressor
Blue LED
Indicates
compressor
speed and
activation
SC Listen
Switch (in)
for Spectral EQ
into audio path
to monitor SC
ATTACK
Variable attack
time for the
compressor
2mS to 200mS
RELEASE
Variable release
time for the
compressor
100mS to 5S
SPECTRAL
Sweep frequency
for LF and HF
bands, used with
above threshold
controls
SIDE-CHAIN
Inserts spectral
EQ into side-
chain
METER
Recessed
screwdriver
adjust for 0dB
gain-reduction
meter trim.
AC POWER
Note: Check 
rear power input
connector for
correct local
ac voltage. Allow
forty seconds for
the soft-start
procedure to
activate the
the audio
signal path.
AVALON
Class A Vacuum Tube
STEREO SPECTRAL OPTO-COMPRESSOR WITH TSP
POWER LED
Indicates ac
power is on
MAKE-UP
0dB to +10dB
variable gain on
opto-compressor
METER
High quality
VU meter
indicates
gain reduction
0dB to -20dB
VT-747SP
Avalon Design is a division of Avalon Industries, Inc. 2001
c
OUTPUT METER
Fast LED meter
indicates both L-R
spectral content
and output level
-30dB to +30dB
OUTPUT LEVEL
Stereo output
level control
-20dB to +6dB
detent at 0dB
EQ
Switch (in)
activates 6 band
passive EQ into
audio path
(hard-wire bypass)
Note:
For the best sonic performance, 
allow thirty minutes for warm-up.

When not in use, turn the ac off. This will
extend the life of the electronics . . Enjoy!
Note:
Knob settings shown represent
starting positions only.
TSP
TWIN SIGNAL PATH
All units in dBu.
Figure 2.1 Quick Set-up Guide