Avalon V55 User manual

AVALON
V-Fifty Five
DI-RE-PREAMPLIFIER
Pure Class A
DESIGNAVA L O N
55
V

FEATURES
100% discrete, Pure Class A, high-voltage signal amplifiers in all audio
paths for maximum dynamic range and +30dB operating headroom.
Hi-Z, 10,000,000 ohm Instrument DI inut for invisible “Zero-Loading”.
Wide range, premium, low-ratio microphone input transformer.
Dual impedance selector for ribbon, dynamic and powered microphones.
Passive TONE BANK™ for custom filtering and unique tone shaping.
Hi-Cut passive FILTER for eliminating unwanted high frequency buzz.
High performance, fully isolated transformer for RE-AMPING functions.
Wide range, professional VU meter with custom scale -30dB to +18dB.
Dual color, LED meters for 0dB and +20dB fast PEAK signal capture.
High power personal headphone monitor output.
High-current, DC coupled output drivers for deep and controlled bass.
Sealed, silver contact relay switching for all audio routing and bypass.
Precision, gold plated, switched gain control for accurate 2dB steps.
Low noise, AC toroid and discrete high-voltage linear DC power supply.
AVA L O N D E SI G N - PURE CLASS A
V55 HIGH-VOLTAGE DI-RE-P REAMPLIFIER
The Avalon V55 DI-RE-MIC PREAMPLIFIER is an ultra high performance,
professional, dual channel preamplifier, instrument DI and RE-AMP.
Created for maximum versatility, the V55’s sonic signature of “Deep and
Controlled Bass, Musical Mid-range and enhanced Vocal Projection”
combine with a unique “ten point” passive TONE BANK™, high-cut
buzz filter, large wide-range analog VU meter and long-life quality
construction...The V55 will capture every magical performance and
continues Avalon’s passion and commitment to Sonic Excellence !

Check AC power selector on rear panel for correct local supply 115v or 230v.
TO CHANGE AC VOLTAGE: Carefully flip the voltage/fuse panel open, remove
the RED volatge/fuse card and rotate to indicate correct AC voltage through
rear voltage display window. Close plastic cover flap and press closed to lock.
BOOST
control:
Boosts gain in 2dB steps for ALL inputs.
AVALON V55 OPERATING INSTRUCTIONS
LINE
INSTRUMENT - DI
MICROPHONE Hi-Z
MICROPHONE Lo-Z
- 2dB to +38dB
+2dB to +42dB
+20dB to +60dB
+26dB to +66dB
Input Gain Range
Input PAD and maximum input level with PAD engaged
SIGNAL
LED:
PHASE
REV switch:
INSTRUMENT
& DI input:
PAD
switch:
The blue SIGNAL LED illuminates when the PEAK output
reaches 0dB and red when the PEAK signal is +20dB.
The REV switch reverses the output polarity for ALL outputs
including the transformer ISOLATED (instrument) RE-AMP.
The front mounted TRS jacks accept all active or passive
unbalanced inputs. Input impedance is 10,000,000 ohms.
Maximum input of +28dB or +38dB with the PAD.
The PAD switch adds a resistive attenuator to ALL inputs.
AVA L O N D E SI G N - PURE CLASS A
LINE
INSTRUMENT - DI
MICROPHONE Hi-Z
MICROPHONE Lo-Z
- 13dB PAD +45dB
- 10dB PAD +38dB
- 13dB PAD +23dB
- 15dB PAD +19dB
2
19
10
11
1
2
3
4
5
5
6
7
8
3
4

AVALON V55 TONE-FILTER GRAPHS.
+6
- 24
10
0dB
100 1kHz 10k 20k
+6
- 24
10
0dB
100 1kHz 10k 20k
+6
- 24
10
0dB
100 1kHz 10k 20k
+6
- 24
10
0dB
100 1kHz 10k 20k
1acoustic and string
instruments, electric
bass and keyboards
2electric bass guitar
and mid scoop
3acoustics, strings,
electric and bass
guitar and keyboards
4acoustics, strings
electric and bass
guitar and keyboards
5acoustic and electric
instruments
6 electric and bass
guitar
+6
- 24
10
0dB
100 1kHz 10k 20k
+6
- 24
- 6
- 6 - 6 - 6
- 6 - 6
10
0dB
100 1kHz 10k 20k
+6
- 24
10
0dB
100 1kHz 10k 20k
vocals and instruments,
high pass, rumble filter
50Hz @ 6dB/octave
- 6
+6
- 24
10
0dB
100 1kHz 10k 20k
vocals and instruments,
high pass, rumble filter
90Hz @ 6dB/octave
- 6
+6
- 24
10
0dB
100 1kHz 10k 20k
+6
- 24
10
0dB
100 1kHz 10k 20k
- 6 - 6
AIR-LIFT vocals,
acoustic-electric
instruments
AIR-LIFT &LOW-CUT
vocals, acoustic-
electric instruments
AVA L O N D E SI G N - PURE CLASS A
The V55 TONE-FILTERS offer a wide range of “passive” tones & voices
for improved clarity, problem solving filters and music enhancement.
TONE selections 1 through 6 are identical to the TONE-BANK™
options in the Avalon U5 “Ultra-Five” Direct Box-preamplifier.

AVALON V55 REAR PANEL CONNECTIONS
AC
input
EARTH
lift
LINE
out
THRU
out
ISO
out
LINE
input
PHONES
out
MIC
input
1
3
4
2
AC VOLTAGE SELECTOR. Select for either 115v or 230v.
FUSE 5mm slow blow type : 115v = 0.2A, 230v=0.1A.
Switch isolates chassis ground from audio signal gound,
UP position is LIFTED.
Dual TRS Jack and XLR BALANCED outputs, DC coupled,
high-current, 600 ohm, +30dB maximum.
THRU output is BUFFERED from Instrument DI input
located on front panel. Ideal for amplifier inputs or tuners.
The ISOLATED (RE-AMP) output is transformer isolated
via the TRS jack. Signal is UNBALANCED +12dB maximum.
XLR BALANCED and TRS (balanced) jack line input,
transformer isolated, +45dB maximum input, pin 2=hot.
Headphone TRS jack 0.5W maximum 600 ohms.
XLR BALANCED microphone input, transformer isolated,
+23dB maximum input, pin 2=hot.
1
43
58
6 7
2
AVA L O N D E SI G N - PURE CLASS A
5
6
7
8

V55 DI-RE-PREAMPLIFIER
10 MEG
DC
DISCRETE
CLASS A
AMPLIFIER DISCRETE
CLASS A
AMPLIFIER
+2dB / STEP
DC
DC DC
DISCRETE
CLASS A
AMPLIFIER
DISCRETE
CLASS A
AMPLIFIER
DISCRETE
CLASS A
AMPLIFIER
-2dB ~
~
+36dBLINE
+2dB ~+42dBINST / DI
+20dB ~+60dBMIC HI-Z
+26dB ~+66dBMIC LO-Z +26dB ~+66dBMIC +48v
INPUT GAIN RANGE
PAD
IN
PHASE
REV
TONE
ON SIGNAL
VU METER
HI
IN
2
LINE
1
121 121
110
MIC HI-Z INST / DI
3
MIC LO-Z
4
MIC LO-Z +48v
5
+48v
+36v
-
36v
+15v
-
15v
+12v
+36v
-
36v
+48v +36v
INPUT
MODE
BOOST
T
TONE
BANK
THRU OUT
LINE IN
AC INPUT
ISOLATED OUT
TO AMP
LINE OUTPUT
PHONES OUT
RED
0dB
+20dB
OUTPUT
SIGNAL
TO ALL
RELAY’S
OUTPUT LEVEL
VU
BLUE
PHANTOM
-
15dB
-
10dB
MIC
LINE
HI-Z
LO-Z
MIC/LINE
INSTRUMENT
OUTPUT
TRANSFORMER
POLARITY
REVERSE
TONE
BYPASS
PASSIVE
FILTER
BUFFERED
OUTPUT
PASSIVE
FILTER-TONE
HF CUT
BYPASS
IN
-
13dB
-
20dB
-
18dB
Avalon reserves the right to incorporate changes in design and in
the specifications of this product without prior notice.
Avalon Design is a division of Avalon Industries, Inc. © 2019.
www: avalondesign.com
POWER
RED
+48V
ON
SOFT
START
FUSE
INPUT
TRANSFORMER
AC FILTER
TRANSFORMER
EARTH
LIFT
115v-2 30v
REGULATED
DC POWER
SUPPLIES
+15v
+
-
-
15v
LOG & PEAK
VU METER
LED DRIVER
TO INPUT
MODE
AVA L O N D E S I G N
Burbank, California U.S.A.
MICROPHONE IN
INSTRUMENT IN
V
55

Audio circuit topology
Gain range:
Line :
- 2dB ~ +38dB
Instrument : +2dB ~ +42dB
Microphone Hi-Z : +20dB ~ +60dB
Microphone Lo-Z : +26dB ~ +66dB
PAD (passive input attenuator)
Phantom power
Input - Output connectors
Maximum LINE output level
Maximum ISOLATED output level
Headphone output
Noise 22Hz-22kHz unweighted
Distortion THD, IMD
Frequency response, +/-0.5dB
Frequency response, -3dB
VU meter
Signal LED
High cut filter
Tone selector
Polarity reverse
AC power
Fuse
Dimensions
Weight
100% discrete, high-voltage, Class A
Gain switched in 2dB steps, +/-0.2dB
Transformer balanced, 9,000 ohms
Unbalanced, 10,000,000 ohms
Transformer balanced, 6,600 ohms
Transformer balanced, 1,800 ohms
Line -13dB, Instrument -10dB, Mic -15dB
+48v regulated, 10mA
XLR, pin 2 hot, all jacks TRS (tip = hot)
+30dBu, DC coupled, balanced 600 ohms
+12dBu, transformer isolated, unbalanced
0.5W, 600 ohm load
- 98dBu typical, minimum gain (-128dB EIN)
0.05% at +10dBu, 0.5% at +30dBu
2Hz to 20kHz
2Hz to 500kHz (internal band limited)
Professional, wide range -30dB ~ +18dB
LED peak capture blue 0dB, red +20dB
-3dB at 3.7kHz, minimum phase design
10 passive filter-tone selections
All outputs (relay switched)
Internal toroidal AC supply 115v~230v
REAR selectable, 50/60Hz, 0.5A, 35w max.
19 x 3.5 x 12 in (483 x 88 x 305mm)
24lbs (10.9kg)
Avalon reserves the right to incorporate changes in design and in the specifications of this product without prior notice.
AVALON DESIGN
3417 W. Burbank Blvd., Burbank, California 91505 U.S.A.
Tel: 949 - 492-2000
www.avalondesign.com
Avalon Design is a division of Avalon Industries, Inc. © 2019.
SPECIFICATIONS
V55 HIGH VOLTAGE DI-RE-P REAMPLIFIER