Item #: AVA VT737SP LIST Mfr# VT737SP

Avalon Design Vt737SP Direct Recording Channel Strip

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Product Description

The Avalon VT737SP features a combination of TUBE preamplifiers, opto-compressor, sweep EQ, output level and VU metering.
VT737SP's preamp provides a 48V phantom powered input, an Instrument DI and a balanced line input. The Opto-compressor features twin Class A tube triodes for gain matching. 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-compressor. The high and low EQ bands provide the smooth characteristics of an all passive design, while the dual mid bands include variable frequency and switched Q-width selection. Whether you're recording a solo vocalist or an acoustic instrument, mastering, or recording symphonies, let Avalon take you to the leading edge in analog and experience sonic reality like never before!

Avalon VT737SP Features Top Seller
  • Vacuum tube triode signal path
  • Soft-start tube life extender
  • Stereo link for compressors
  • Sealed silver relays for signal routing
  • Transformer balanced microphone input
  • High-voltage circuits for max headroom and low noise
  • Discrete Class A equalizer with musical passive filter
  • Internal discrete power supply with toroidal transformer
  • Large control knobs with professional conductive plastic potentiometers
  • VU meter for output level monitoring and compressor gain reduction

Preamplifier
The VT737SP has three input selections:
  • A higher-performance mic input transformer with +48v phantom selection
  • An instrument DI high source input with jack located on front panel
  • A 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-essing 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 VT737SPs 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 VT737SP 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.

Product Specifications
Avalon VT737SP Class A Tube Channel Strip 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 1/4 inch jack)
    • Line: +36dB (balanced XLR)
  • Maximum output level: +30dB balanced, 600 ohms, DC coupled
  • Output type: 1/4 inch balanced connector
  • Output gain: -45dB to20dB
  • Noise: 20kHz unweighted (-92dB)
  • Noise microphone EIN: 22Hz to 22kHz unweighted (-116dB)
  • 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: High quality illuminated OVU (+4dB)
  • Gain reduction: up to -20dB
  • High cut filter: Variable 6dB per octave 30Hz to 140Hz
  • Compressor type: Optical passive attenuator with twin vacuum tubes/stereo link
  • Threshold: -30dB to +20dB (variable)
  • Ratio-compression: 1:1 to 20:1 (variable)
  • Attack: 2mS to 200mS (variable)
  • Release: 100mS to 5 seconds (variable)
  • Equalizer type:
    • Discrete Class A
    • Variable active
    • 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 inches (482 x 305 x 89 mm)
  • Weight: 22 lbs (10 kg)


Helpful Info about the Manufacturer
Phone:  949-492-2000 Warranty: 
Michael Torres, miketorres3257@yahoo.com Submitted: 9/26/2018
Product Rating
verified
Subject
Number one vocal preamp this thing is great
Product Rating
What is your opinion of this product?
My name is Michael, The Avalon 737sp is the best thing I did for my studio. It works wonders to the vocals as well as any instrument. American Musical Supply you guys are great as well thanks!!
AMS Responds:
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BL Submitted: 4/8/2011

Subject
One of the best
Your general opinion of this product.
Excellent and well made. I have other units that offer plenty of "coloration" but I prefer this one for clarity and punch.
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Basstohven from Houston Texas Submitted: 12/22/2008

Subject
Ooh wee
Your general opinion of this product.
Tite tite tite
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Jim Morris from Batavia Illinois Submitted: 2/5/2008

Subject
Great Unit. Allows the user to slam into the red
Your general opinion of this product.
The Avalon VT737SP is a great unit. It has so many strengths that basically you could say that as a MIC Pre/Channel Strip goes, this is in the top 10% of all of the units out there. The best thing about the Avalon 737 is that the unit allows the user to slam into the "red" without the distortion and craziness of similiarly priced units. And this opens all types of Harmonic possibilities. In my studio the Avalon supercedes much posher names with ease. Everyone wants to try the Tube-Tech, and the Manley Units in my Studio, but they come back to the Avalon. This is not to say that the unit has some flaws. The EQ section is a bit weak. One of the recording artists that frequents the studio asked our Chief Engineer whether or not the EQ section even worked. And this was after fiddling with the EQ for almost an hours time. Likewise, the Compressor part of the unit is a tad weak. I believe that Avalon will need to address these shortcomings in Models to come. But, with all
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Marc Klock from Canoga Park Submitted: 2/5/2008

Subject
Not had very long
Your general opinion of this product.
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AMS Customer from USA Submitted: 2/5/2008

Subject
the best for sweet sound
Your general opinion of this product.
for home enthusiasts, this is a stupidly expensive piece of gear that you ought to try out. want pro sound? here it is, in spades. a good mike helps. my akg 451's didn't like it at all, though. the 414's and the microtech gefell made me cry, it was so unbelieveable. if you play guitars, bass, or sing--you'll never want to give it back. my buddy is letting me use his while he fixes up his studio. i'm gonna just die when he takes it back. p.s. let it warm up really well--like don't ever turn it off. it's happy when it's been on for a good while. good luck
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AMS Customer from USA Submitted: 2/5/2008

Subject
The one and only? Look but don't tuch?
Your general opinion of this product.


QUALITY:
5

FEATURES:
5

EASE OF USE:
5

VALUE:
5

SOUND:
5

STYLE:
Rap, Hip Hop, R&B, latin

MUSIC EXPERIENCE:
I have my own studio in my house. so I record my self all day long.

OVERALL:
The 737 is a warm night. If I replace it, its only to get a new one The only way I would look for a procuct like it is if they stopped making them. If I had an Avalon VT737 I wouldn't trade it for the world. The only way I would sell the avalon is if I ran out of money to feed my little girl. If I never seen the 737 I would still buy it just because of the way it looks. The warm sound that it gives to any voice. The worst thing about this product is me not having it. I know it is alot of money and out of my price rang but, to tell you the truth I think it is worth alot more then $1900.00
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12 Payments! 0% Interest!
12 Payments! Ltd Time!
No Special Credit Card Application - 0% Interest! Your credit card will be billed in 12 equal payments, every 31 days, starting on the day your order is shipped. 12 Payment plan will need credit approval.

12 Payments of
$247.09
$2,965.00
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