"The Vt-747sp is a
brilliant and innovative design with an incredible compressor and sweet
no-nonsense EQ. With TSP engaged mixes are fat and rich with harmonics. The
Vt-747sp is very versatile and is an awesome finishing processor across the
stereo buss during mixdown. I also plan to use it during direct to tape
recording of stereo keyboards and for project studio mastering. It has a unique
and distinctive sound and looks great too." - Dale P., CA
"The Vt-747sp is
the fattest and cleanest sounding piece I've ever heard!"
- Scott S.,
FL
"I just wanted to let
you to know
that you guys make great front of house gear! I have a Vt-747sp across the buss
mix on the house console and I love it! The 32k EQ really opens up the P.A.
Thanks for the great gear, keep up the good work." - Eric C.,
MO
"I am using the
Vt-747sp as a mastering tool in my sound system. The effect has been dramatic. I
even have ordinary punters telling me the sound is great. Best wishes from
Ireland." - Tony H., Ireland
The Avalon VT-747SP combines a creative STEREO tube-discrete
Class A spectral-opto-compressor with a musical six band program equalizer, L-R
output level and gain reduction metering and internal regulated power supplies
in a 2U space. Ideal for high performance DAW input signal conditioning, stereo
buss compression-EQ, stereo keyboards and analog mastering applications.
SPECTRAL-OPTO-COMPRESSION
The opto-compressor
features a minimum signal path design utilizing sealed silver relays for all
signal routing and by pass functions. The optical attenuator acts as a passive
level controller with a Class A, variable gain make-up amplifier. Full dynamic
control from soft compression to hard-knee limiting can be achieved with master
threshold, ratio-compression, attack and release controls. Gain reduction
indication is a large analog VU meter. Low frequency and high frequency contour
parametric spectral controls can be routed into the side-chain path for enhanced
frequency dependent compression with variable frequency and threshold levels. SC
listen provides side-chain listen mode for monitoring.
SIX BAND PROGRAM EQUALIZER
The VT-747SP equalizer
utilizes 100% discrete, Class A high-voltage transistors for optimum sonic
performance. The six band STEREO program EQ incorporates the smooth
characteristics of an all passive design. The frequency turnover, Q and
amplitude ranges have been carefully chosen for each band to provide the most
natural harmonic balance and lowest phase change while offering simple and
effective tone control. The EQ can be placed pre or post the opto-compressor for
enhanced effects.
TSP - TWIN SIGNAL PATH
The VT-747SP features TSP
which gives you the choice of either tube tone or the classic, Class A discrete
transistor sound by exchanging, three (3) high-voltage dual triode tubes with
discrete amplifiers in the opto-compressor and primary output stages.
INPUT-OUTPUT and METERING
Fully balanced DC coupled,
Class A discrete amplifiers are utilized for the input and output drive
interface with+36dB input headroom. A high quality analog VU meter indicates
accurate gain reduction. Twin 60dB range LED meters provide fast L-R output
status of all levels.
CLICK TO SEE ENLARGED
VERSION
VT-747 SP
CLASS A, VACUUM
TUBE-DISCRETE
TWIN SIGNAL PATH OPTO-COMPRESSOR-EQUALIZER |
| VT-747SP
FEATURES |
- Stereo Class A opto-compressor with spectral control
- Stereo Class A six band discrete passive program EQ
- TSP twin signal path, vacuum tube bypass
- Low noise -92dB
- Fully balanced Class A input and DC coupled outputs
- Stereo dynamic 60dB high resolution output meters
- High quality analog VU meter for gain reduction
- High headroom+36dB input before overload
- Spectral side-chain monitor for pre listen
- EQ pre-post selection for opto-compressor
- Sealed silver relays for all signal routing
- Internal discrete regulated power supplies
- Military spec vacuum tubes for long life and low
noise
| |
VT-747SP
SPECIFICATIONS |
| Circuit
topology |
Three (3) dual triode vacuum
tubes (Sovtek 6922), high-voltage discrete Class A mode. |
| Input gain
range |
Balanced, Class A, 20k ohms,
-20dB to +16dB with high gain switch |
| Maximum input
level |
+36dB balanced XLR pin 2
hot |
| Maximum
output level |
+30dB balanced 600 ohms, DC
coupled, discrete Class A |
| Output
type |
XLR connector, output trim
gain -45dB to +6dB |
| Noise 20kHz
unweighted |
-92dB |
| Distortion
THD, IMD |
0.5% |
| Frequency
response -3dB |
1Hz to
200kHz |
| Gain
reduction meter |
High quality, illuminated
gain reduction meter 0dB to -20dB range |
| Output
meter |
Twin 20 segment LED VU
meters with -27dB to +30dB range |
| Compressor
type |
Optical passive
attenuator |
| Make-up
gain |
Variable 0dB to +10dB stereo
tracking |
| 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 |
| Side-chain
spectral contour |
Variable threshold -15dB to
+15dB, frequency 70Hz to 9kHz twin ranges |
| Equalizer
type |
Discrete Class A, passive
design optimized for full range program material |
| Frequency bands (6) |
Variable amplitude LF
+/-24dB
15Hz shelf response
Variable amplitude MF1
+/-8dB 125Hz
selected Q response
Variable amplitude MF2 +/-4dB 500Hz selected Q response
Variable
amplitude MF3 +/-4dB 2kHz selected Q response
Variable amplitude MF4
+/-10dB 5kHz shelf response
Variable amplitude
HF +/-20dB 32kHz shelf
response |
| AC
power |
Internal toroidal 100v to
240v, 50-60Hz selectable, 70 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) | |
