Avalon Design VP-747 User Manual
INPUT GAIN
Trims input level
-20dB to +8dB
detent at 0dB
(+18dB with +10dB IN)
THRESHOLD
+10dB switch
Boosts input
amplifier by
Sets compressor
input threshold
from -30dB to
+10dB for extra
tube over-drive
LF and HF THRESHOLD
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
+20dB
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
VT-747SP QUICK SET-UP OPERATING GUIDE
SIX (6) BAND PASSIVE CLASS A, PROGRAM EQUALIZER
F4
Boost-cut
sets amplitude
of mid-range
-4dB to +4dB
detent at 0dB
2kHz
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
COMPRESSION
Sets ratio of
compressor
from 1:1 to 20:1
COMPRESSOR
Switch (in) engages
compressor into
signal path
(hard-wire bypass)
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
v
t
747
sp
ATTACK
Variable attack
time for the
compressor
2mS to 200mS
INPUT
0
11
3 2
20 8
-
dB+
GAIN
+10dB
ATTACK
FAST SLOW
Twin Signal Path
Switch (in) swaps
three (3) tubes
into the audio
path from discrete
Class A amps.
46
610
SIGNAL
TSP
TSP
TUBE
PATH
-
10
THRESHOLD
3+2
0
20 20
-
dB+
EQ COMP
IN IN IN IN INININ
RELEASE
FAST SLOW
6
10
1615
SIDE-CHAIN
Inserts spectral
EQ into side-
RELEASE
Variable release
TSP
TWIN SIGNAL PATH
time for the
compressor
100mS to 5S
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!
SIDE-CHAIN THRESHOLD
CONTOUR
-15 +15 -15 +15
LF
200
160 250
100
80
70 600
60
1k
Hz
300
400
GR SC LISTENSIDE-CHAIN
1k6 2k5
1k
800
700 6k
600
HF
2k
Hz
SPECTRAL
chain
Sweep frequency
for LF and HF
bands, used with
above threshold
controls
COMPRESSION
4 7
1 20
RATIO
METER
COMPRESSOR
CAL
GR
MAKE-UP
+2 +6
3k
4k
0dB
10k
METER
Recessed
screwdriver
adjust for 0dB
gain-reduction
meter trim.
65
83
102
10
20
-
7
5
decibels
3
VU
2
1
0
1
2
3
+
AVALON
VACUUM TUBE
+10
GAIN
MAKE-UP
0dB to +10dB
variable gain on
opto-compressor
POWER LED
Indicates ac
power is on
High quality
gain reduction
0dB to -20dB
CLASS A PROGRAM EQUALIZER LEVEL
METER
OUTPUT METER
Fast LED meter
VU meter
indicates
indicates both L-R
spectral content
and output level
-30dB to +30dB
AVALON
Class A Vacuum Tube
STEREO SPECTRAL OPTO-COMPRESSOR WITH TSP
VT-747SP
Avalon Design is a division of Avalon Industries, Inc. 2000
c
SIGNAL
30
3
24
18
2
12
1
6
+
+
0
0
6
-
12
1
18
2
24
30
3
OUTPUT LEVEL
Stereo output
level control
-20dB to +6dB
detent at 0dB
RdBL
activates 6 band
(hard-wire bypass)
OUTPUT
0
11
2 2
20 6
-
dB+
EQUALIZER
34
48
EQ
Switch (in)
passive EQ into
audio path
ac voltage. Allow
forty seconds for
Note: Knob settings shown represent
starting positions only.
AVALON
DESIGN
AC POWER
Note: Check
rear power input
connector for
correct local
the soft-start
procedure to
activate the
the audio
signal path.
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