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Item # 580442 | Customer Ratings: Ratings ( 5 Based on 2 reviews)

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Avalon VT-737sp Class A Mono Tube Channel Strip Limited Edition
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      Avalon VT-737sp Class A Mono Tube Channel Strip Limited Edition (580442)
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      Avalon VT-737sp Class A Mono Tube Channel Strip Limited Edition (580442)
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A special edition of an industry standard tube preamplifier/opto-compressor/sweep equalizer.

In honor of the 10th anniversary of the release of the renowned VT-737sp Class A Mono Tube Channel Strip, Avalon has produced a special "Blackface" model. The VT-737SP features a combination of TUBE preamplifiers, opto-compressor, sweep equalizer, output level and VU metering in a 2U space. The VT737SP Anniversary is identical in terms of circuitry, the only difference being cosmetic; the front panel is matte-black and the original orange LEDs have been replaced with cool blue ones.

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 hardwire relay bypass completes the input signal conditioning. The phase reverse relay is available on all three inputs.

OPTO-COMPRESSON
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 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-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
Class A high-voltage transistors are used 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.

VALON 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.
*NOTE: Older versions of the VT-737SP have balanced 1/4" outputs. New models now have XLR outputs. The function remains the same.



Avalon VT-737sp Class A Mono Tube Channel Strip Limited Edition Features:

  • 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


Avalon VT-737sp Class A Mono Tube Channel Strip Limited Edition 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" (482 x 305 x 89mm)
    Weight: 22 lb. (10kg)
    Dimensions-shipping carton: 21" x 18" x 8" (533 x 457 x 203mm)
    Weight-packed: 26 lb. (11.8 kg)


Avalon VT-737sp Class A Mono Tube Channel Strip Limited Edition

One year parts and labor warranty. 90 day warranty for tubes.

Get your gear covered!

Now you can get added warranty protection for your new gear. Pro Coverage steps in where the manufacturer's "normal wear and tear" ends. Our PRO COVERAGE program offers you UPGRADED COVERAGE if your product ever fails!

Pro Coverage includes:

  • Accidental damage protection (new gear only)
  • Expedited Repair
  • Free Shipping (for returns or repairs)
  • 100% Coverage for Commercial Use
  • Extended Return Period
  • Extended Price Protection
  • No Lemon Guarantee
  • Free Transfer of Coverage to a new owner
  • Repair Costs Covered for up to 3 years from date of purchase
  • Repairs Can Be Authorized Toll-Free by Phone or the via the web
Product Reviews
(Based on 2 reviews)
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Viewing Reviews 1 - 2 of 2 |
  • Avalon

    As reviewed by Chino Hernandez on 7/22/2010

    Is the best of the best.. Im so happy w my new avalon 737 anniversary

    2 of 2 people found this review helpful.
    Was this review helpful?
  • GREAT DEVICE

    As reviewed by BLiTZ on 3/23/2010

    OK your looking to buy a pre amp...Well there is the Universal Audio LA 610...the price may change tomorrow, anyway that is the only close comparison to this preamps tested them both bought both of them and I personally like the Avalon, This Avalon seperates the digital to analog, I use two different mics with it as well the nueman tlm 49 and the AKG C414 XL2 both mics are over $1,000, I even got the perception 200 to sound clean, so basically buy this one if you want to sound professinal.

    5 of 6 people found this review helpful.
    Was this review helpful?
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