Avalon Design VT-737
The Avalon Vt 737sp Mono Mic Pre/Compressor/EQ is a combination tube preamp, opto-compressor and sweep equalizer, with output level and VU metering in 2 rackspaces. Balanced mic, front-panel instrument DI, and balanced line inputs. Class A preamp uses 2 cascaded, dual vacuum-tube triodes configured with minimum negative feedback. The Avalon Vt 737sp has a high-gain switch, high-pass filter, and hardwire relay bypass.
Part Numbers: VT-737SP, VT737SP
UPC: 0696818737001, 410000152454, 696818737001
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Avalon Design VT-737 - Datasheet, size: 216 KB
Avalon Design VT-737SP Datasheet
Avalon Design VT-737
AVALON VT 737 SP by Dante Sadott in HarmonyDSPR July 2009
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AVA L O N
D E S I G N
V T- 7
VA C U U M
T U B E
D I R E C T
S I G N A L
P A T H
AVALON VT-737 FEATURES
The Avalon VT-737 features a combination of TUBE preamplifiers, optocompressor, sweep equalizer, output level and VU metering in a 2U space. The VT-737 preamplifier has three input selections: 1. Transformer balanced microphone input, +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 high-performance 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.
Special spectral control including de-ess is available with the dual sweep mid EQ to sidechain 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-737s 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.
Minimal signal path design Four Class A vacuum tube triodes Transformer balanced microphone input EQ to sidechain for de-ess High-voltage circuits + 200v Headroom to +30dB Low noise -92dB Internal discrete power supply Soft-start tube life extender Stereo link All discrete Class A equalizer Sealed silver relays Professional VU meter
The VT-737 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.
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.
AVALON DESIGN PO Box 5976, San Clemente, CA 92673 U.S.A. Tel: 714-492-2000 Fax: 714-492-4284 www.avalondesign.com
AVA L O N D E S I G N V T- 7 VA C U U M T U B E D I R E C T S I G N A L PAT H
Circuit topology Gain range
Four dual triode vacuum tubes, high-voltage discrete Class A Microphone: Transformer balanced 850 ohm, 0dB to +58dB Instrument: Unbalanced 1 meg ohm, 0dB to +30dB Line: Balanced Class A 20k ohms, -27dB to +18dB Microphone +10dB @ 25Hz, +20dB @ 1kHz balanced XLR Instrument +30dB unbalanced front panel jack socket Line +36dB balanced XLR
Maximum Input level and connector types
Maximum output level Output type and gain Noise 20kHz unweighted Noise microphone EIN Distortion THD, IMD Frequency response -/+0.5dB Frequency response -3dB VU meter and gain reduction High cut filter
+30dB balanced 600 ohms, DC coupled, pure Class A XLR connector, output trim gain -45dB to +10dB -92dB -116dB, 22Hz to 22kHz unweighted 0.5% 10Hz to 120kHz input filter included 1 Hz to 200kHz line in-out 0VU = +4dB and gain reduction to -20dB Variable 6dB per octave 40Hz to 200Hz
Compressor type Threshold - Ratio Attack - Release Equalizer type Frequency bands (4)
Optical passive attenuator incorporating twin vacuum tubes and stereo link Threshold variable -30dB to +20dB, ratio-compression variable 1:1 to 20:1 Attack variable 2mS to 200mS, release variable 100mS to 5 seconds Discrete Class A, variable active and switched passive design 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 Internal toroidal 100v to 240v, 50-60Hz selectable, 75 watts maximum 19 x 12 x 3.5 in (482 x 305 x 89mm) 221bs (10kg) 21 x 18 x 8 in (533 x 457 x 203mm) 261bs (11.8kg)
AC power Dimensions Weight Dimensions-shipping carton Weight-packed
Avalon Design is a division of Avalon Industries, Inc. 1997
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