0151 448 2080
Order by phone - Mon-Fri: 9:00AM-6:00PM

Select CurrencyYour Basket 0 items | £ 0.00 Checkout

FREE NEXT DAY DELIVERY* - INSTANT 0% FINANCE AVAILABLE - BUY NOW PAY LATER

Avalon VT-737SP

Dolphin id:
3509
Product SKU:
VT737SP

This product is currently not available for purchase.

Mono Class A mic preamplifier-compressor-EQ-Channel Strip (2U)

Show full description »

The Avalon VT-737SP features a combination of TUBE preamplifiers, opto-compressor, sweep equalizer, output level and VU metering in a 2U space.

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 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-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.

FAQ - Is the mic preamp in the Vt-737sp the same as the AD2022 or M5?

Additional View:

click to enlarge

(click to Enlarge)

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.

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  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  XLR 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  22lbs (10kg) 
  • Dimensions-shipping carton  21 x 18 x 8 in (533 x 457 x 203mm) 
  • Weight-packed  26lbs (11.8kg) 
Image: Avalon VT-737SP

Free Delivery*

FREE NEXT DAY DELIVERY*
More details on UK deliveries.
More details on International deliveries.

Avalon VT-737SP videos

There are currently no videos for this product. If you are registered with us you may log in to add additional videos related to this product. You can also register an account to add a related video.

Avalon VT-737SP Reviews

There are currently no reviews for this product.

Add your review
Security code

Avalon VT-737SP News

There is currently no news for this product.

Show all news »

Price Matching

Dolphin Music brings you the best music gear at the best price. We are committed to superior customer service and have extensive product knowledge. However, in today’s market we may not always be aware of all the price fluctuations of the products we sell. So, we offer competitive price matching.

Please fill in the following form to request a price match.

What prices we will match?

We will compare prices for new, direct from manufacturer items, excluding any add-ons, options, or other special features which may affect price.

The item must be new and must be the exact same make and model (ie, the same size, version, etc.).

Since our postage charges are lower than most of the shops, the comparison price must be a "delivered cost" to the consumer.

If we are unable to verify the previous condition, we will notify you that we require additional information to verify the Price Match request. Our goal is to make this policy simple and hassle-free. We are committed to responding to your requests quickly.

The price you have found must be the Internet Retailer's regular, advertised price for a current and available item. The price you found cannot be a closeout, discontinued, blemished, year-end, inventory reduction, or any other type of advertised sale price.

Price Matching requests may not be combined with any other promotional discounts, specials or other price incentives.

Prices and price sources you have found which do not meet the above criteria or in which incomplete or inaccurate information is provided to us, will not be approved for our Price Match.

Please select your country/region

Choose the region you are shopping from to view products in your currency.

We have temporarily suspended processing of EUR payments, all orders will be charged in GBP.