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    Avalon VT-737SP Class A Microphone Processor

    Vacuum tube triode signal path, transformer balanced microphone input, high-voltage circuits for maximum headroom.
    Product Rated 9.4 Out of 10 (29 ratings)
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    Web Item #AVAVT737SP

    Avalon VT-737SP Class A Mic Processor
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    Avalon Warranty: Avalon Warranty Information One year parts and labor warranty. 90 day warranty for tubes. Avalon does not offer a manufacturer's warranty on Non-New products. If you have additional warranty questions, please call the manufacturer at 949-492-2000
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    Avalon VT-737SP Class A Mic Processor Product Description

    The Avalon VT-737SP 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!

    Black and Blue Version

    To celebrate Avalon's 10th Anniversary, they have released a special Black and Blue faced model. Same great features as the regular finish VT737SP but in a finish sure to attract onlookers.

    Preamplifier

    The VT-737SP has 3 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 2 cascaded, dual vacuum tube triodes configured with minimum negative feedback. A high gain switch boosts the overall gain of the preamplifier. The 4 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 3 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-ess 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 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

    The VT-737SP 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.

    Features:

    - Vacuum tube triode signal path
    - Transformer balanced microphone input
    - High-voltage circuits for maximum headroom to +30dB
    - Low noise floor -92 dB
    - 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

    Same Day Music is an authorized dealer of Avalon products.

    Avalon VT-737SP Technical Description

    Circuit topology
    4 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
    Microphone26dB@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
    1/4" connector, output trim gain -45dB to20dB

    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 in (482 x 305 x 89mm)

    Weight
    22 lbs (10 kg)

    Dimensions - Shipping Carton
    21 x 18 x 8 in. (533 x 457 x 203mm)

    Weight - Packed
    26 lbs (11.8 kg)

    Same Day Music is an authorized dealer of Avalon products.
    Shipping Weights and Dimensions
    Black and Blue, 10th Anniversary Edition
    Shipping Weight: 27 lbs
    Shipping Dimensions: 22 x 19 x 8 in
    Silver Face
    Shipping Weight: 27 lbs
    Shipping Dimensions: 22 x 19 x 8 in

    Avalon VT-737SP Class A Mic Processor Catalog Description

    Dream channel strip@Class A tube mic pre@Opto-compressor@4-band EQ with 2 sweepable mids@DI input; XLR I/O

    Same Day Music is an authorized dealer of Avalon products.

    User Reviews for Avalon VT-737SP Class A Mic Processor

    Product Rated 9.4 Out of 10 (29 ratings)
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