"This is the very best channel strip in
the world! I love the warmth it's adding to my DAW."
- Kenny
H., KY
"The
Vt-737sp is ungodly, awesome, DA BOMB!" - Ian C., PA
"My
Avalon Vt-737sp is AMAZING. My friend recommended it to me.
I was playing some Spanish guitar on one of his records one
day, and he said here's what the Avalon sounds like. I bought
mine that week." - Scott
V., Email
The
Avalon VT-737SP
features a combination of TUBE preamplifiers, opto-compressor, sweep
equalizer, output level and VU metering in a 2U space.
PREAMPLIFIER
The VT-737SP has three input selections: 1. The VT-737SP features
a higher-performance microphone input transformer with +48v phantom
selection. 2. Instrument DI high source input with jack located
on front panel. 3. Balanced line input, discrete high-level Class
A. The Class A preamplifier utilizes two cascaded, dual vacuum tube
triodes configured with minimum negative feedback. A high gain switch
boosts the overall gain of the preamplifier. The four high quality
tubes are configured as singled ended anode coupled followers. A
passive-variable high pass filter and hard-wire relay bypass completes
the input signal conditioning. The phase reverse relay is available
on all three inputs.
OPTO-COMPRESSOR
The opto-compressor features a minimum signal path design with twin
Class A vacuum tube triodes for gain matching. The optical attenuator
acts as a simple passive level controller. Full dynamic control
from soft compression to hard- knee limiting can be achieved with
threshold, ratio-compression, attack and release controls plus gain
reduction selection on the large VU meter. Special spectral control
including de-ess is available with the dual sweep mid EQ to side-chain
switch. The EQ section can be flipped pre or post the opto-compressor
via a front panel switch for alternate effects and tone shaping.
Two VT-737SPs can be linked via a rear panel link cable for stereo
tracking. The compressor bypass is a sealed silver relay for the
most direct signal path.
SWEEP-EQUALIZER
AND OUTPUT LEVEL
The VT-737SP equalizer utilizes 100% discrete, Class A-high-voltage
transistors for optimum sonic performance. The high and low frequency
bands provide the smooth characteristics of an all passive design,
while the dual mid bands include variable frequency and switched
Q-width selection. The enhanced range of the mid bands is extended
into the high and low bands by the use of X10 frequency multipliers.
The bypass switch incorporates a sealed silver relay for the most
direct signal path. When the EQ to sidechain is engaged, the high-low
EQ remains in the audio path for "tone enhancement". The output
level control provides a variable control of the overall signal
path. The output amplifier utilizes another dual triode vacuum tube
driving a 100% discrete, Class A, high-current, balanced and DC
coupled low noise output amplifier.
AVALON
VT-737SP FEATURES
Vacuum
tube triode signal path, transformer balanced microphone input,
high-voltage circuits for maximum headroom to +30dB, low noise -92dB,
internal discrete power supply with toroidal transformer, soft-start
tube life extender, stereo link for compressors, all discrete Class
A equalizer with musical passive filter design, sealed silver relays
for signal routing, large control knobs with professional conductive
plastic potentiometers, VU meter for output level monitoring and
compressor gain reduction.
FAQ
- Is the mic preamp in the Vt-737sp the same as the AD2022 or M5?
VT-737SP SPECIFICATIONS |
Circuit topology
|
Four dual
triode vacuum tubes (Sovtek 6922), high-voltage discrete Class
A |
Gain Range
|
Microphone: Transformer balanced 850/2500 ohm, 0dB to +58dB Instrument: Unbalanced 1 meg ohm, 0dB to+30dB Line: Balanced Class A 20k ohms, -27dB to 28dB
|
Maximum input level and connector types
|
Microphone: 26dB@25Hz, +30dB@1kHz balanced XLR Instrument+30dB unbalanced front panel jack socket Line +36dB balanced XLR
|
Maximum output level
|
+30dB balanced 600 ohms, DC coupled, discrete Class A
|
Output type and gain
|
XLR connector, output trim gain -45dB to 20dB |
Noise 20kHz unweighted
|
-92dB
|
Noise microphone EIN
|
-116dB, 22Hz to 22kHz unweighted
|
Distortion THD, IMD
|
0.5%
|
Frequency response -/2.5dB
|
10Hz to 120kHz input filter included
|
Frequency response -3dB
|
1Hz to 200kHz line in-out
|
VU meter and gain reduction
|
High quality illuminated OVU =+4dB and gain reduction to -20dB
|
High cut filter
|
Variable 6dB per octave 30Hz to 140Hz
|
Compressor type
|
Optical passive attenuator incorporating twin vacuum tubes and stereo link
|
Threshold - Ratio
|
Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1
|
Attack - Release
|
Attack variable 2mS to 200mS, release variable 100mS to 5 seconds
|
Equalizer type
|
Discrete Class A, variable active and switched passive design
|
Frequency bands (4)
|
Treble - switched 10kHz, 15kHz, 20kHz, 32kHz, +/- 20dB range, shelf High mid - variable 200Hz to 2k8Hz and 2kHz to 28kHz, +/- 16dB range, hi-lo Q Low mid - variable 30Hz to 450Hz and 300Hz to 4k5Hz, +/- 16dB range, hi-lo Q Bass - switched 15Hz, 30Hz, 60Hz, 150Hz, +/- 24dB range, shelf
|
AC power
|
Internal toroidal 100v to 240v, 50-60Hz selectable, 75 watts maximum
|
Dimensions
|
19 x 12 x 3.5 in (482 x 305 x 89mm)
|
Weight
|
22lbs (10kg)
|
Dimensions-shipping carton
|
21 x 18 x 8 in (533 x 457 x 203mm)
|
Weight-packed
|
26lbs (11.8kg)
|
|