Avalon design VT-747SP DATASHEET

CLASS A STEREO SIGNAL PATH

The Avalon VT-747SPcombines a creative
STEREO tube-discrete Class A opto­compressor 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. 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, ratio­compression, attack and release controls.
Gain reduction indication is a large analog
VU meter. LF and HF 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 sidechain listen mode for
monitoring. Sealed silver relays are used
for all signal routing and bypass functions.

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 of 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 placing, high-voltage dual triode tubes
or discrete amplifiers in the primary output
amplifiers.

INPUT- OUTPUT- 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.

COMPRESSOR-EQUALIZER

PO Box 5976, San Clemente, CA 92673 U.S.A. Tel: [phone] Fax: [phone] www.avalondesign.com

VT-747SP

STEREO CLASS A, VACUUM TUBE-DISCRETE TWIN
SIGNAL PATH OPTO-COMPRESSOR-EQUALIZER

VT-747SP FEATURES

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Stereo Class A opto-compressor with spectral control

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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

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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 vacuum tubes for long life and low noise

AVALON DESIGN

P

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AVALON DESIGN

TSP

TWIN SIGNAL PATH

© 1999 AVALON INDUSTRIES, INC. PO Box 5976, San Clemente, California, U.S.A.

Tel: [phone] Fax: [phone] www.avalondesign.com e-mail: avalon@avalondesign

Avalon reserves the right to incorporate changes in design and in the specifications of this product without prior notice.

VT-747SP SPECIFICATIONS

Circuit topology
Input gain range

Maximum input level
Maximum output level
Output type
Noise 20kHz unweighted
Distortion THD, IMD
Frequency response -3dB

Gain reduction meter
Output meter

Compressor type
Make-up gain
Threshold - Ratio
Attack- Release
Side-chain spectral contour

Equalizer type
Frequency bands (6)

AC po wer
Dimensions
Weight
Dimensions-shipping carton
Weight-packed

Dual triode vacuum tubes, high-voltage discrete Class A
Balanced, Class A, 20k ohms, -6dB to +16dB with high gain switch

+36dB balanced XLR pin 2 hot
+30dB balanced 600 ohms, DC coupled, discrete Class A
XLR connector, output trim gain -45dB to +10dB

-92dB

0.5%
1 Hz to 200kHz

High quality, illuminated gain reduction meter 0dB to -20dB range
Twin 20 segment LED VU meters with -27dB to +30dB range

Optical passive attenuator
Variable 0dB to +10dB stereo tracking
Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1
Attack variable 2mS to 200mS, release variable 100mS to 5 seconds
Variable threshold -15dB to +15dB, frequency 70Hz to 9kHz twin ranges

Discrete Class A, passive design optimized for full range program material
Variable amplitude LF +/-16dB 10Hz shelf response
Variable amplitude MF1 +/-6dB 100Hz selected Q response
Variable amplitude MF2 +/-4dB 550Hz selected Q response
Variable amplitude MF3 +/-4dB 2kHz selected Q response
Variable amplitude MF4 +/-8dB 5kHz selected Q response
Variable amplitude HF +/-16dB 32kHz shelf response

Internal toroidal 100v to 240v, 50-60Hz selectable, 55 watts maximum
19x 12x3.5 in (482x305x89mm)
221bs (10kg)
21 x 18 x 8 in (533 x 457 x 203mm)
261bs (11.8kg)

TSP

TWIN SIGNAL PATH

AVALON DESIGN