Avalon VT-737SP and Neumann U87 Studio Set Bundle
The ultimate front end - a legendary Neumann U87 microphone (nickel finish) with genuine E87 shock mount, and an Avalon VT-737SP tube-based channel strip. A combination made in heaven!
- Combines tube preamplifiers, an opto-compressor, a sweep equalizer, output level and VU metering
- Mic input, a Hi-Z instrument input and a balanced line input
- Vacuum tube triode signal path, transformer
- Classic U87 with genuine Neumann shockmount
- Package includes high quality cable
- Read More
Package consists of:
• 1 x Avalon VT-737SP Channel Strip
• 1 x Neumann U87Ai microphone (Nickel)
• 1 x Neumann EA87 Suspension For U87 (Nickel)
Neumann U87Ai microphone (Nickel)
The U 87 is probably the best known and most widely used Neumann studio microphone. It is equipped with a large dual-diaphragm capsule with three directional patterns: omnidirectional, cardioid and figure-8. These are selectable with a switch below the headgrille.
A 10 dB attenuation switch is located on the rear. It enables the microphone to handle sound pressure levels up to 127 dB without distortion.
Furthermore, the low frequency response can be reduced to compensate for proximity effect.
The U 87 Ai condenser microphone is a large diaphragm microphone with three polar patterns and a unique frequency and transient response characteristic.
Users recognize the microphone immediately by its distinctive design. It is a good choice for most general purpose applications in studios, for broadcasting, film and television.
The U 87 Ai is used as a main microphone for orchestra recordings, as a spot mic for single instruments, and extensively as a vocal microphone for all types of music and speech.
The U 87 Ai is addressed from the front, marked with the Neumann logo. The frequency response of the cardioid and figure-8 directional characteristics are very flat for frontal sound incidence, even in the upper frequency range. The microphone can be used very close to a sound source without the sound becoming unnaturally harsh. By means of a high-pass filter interferences through subsonic and low frequencies are reduced remarkably.
The dual-diaphragm capsule is elastically mounted and protected by a large headgrille. A switch below the headgrille selects the three directional patterns: omnidirectional, cardioid and figure-8. A window above this switch shows the symbol of the selected characteristic.
The letter A in the name indicates a more recent generation, as compared to the U 87 i microphones that were built from 1967 to 1986. Modifications apply to the electronic components of the microphone only: the capsule remained unchanged.
The present-day circuitry increases the operational headroom of the U 87 Ai by supplying the bias voltages for the capsule through a reduced resistance. The result is a higher sensitivity of 10 dB for identical sound pressure levels, and an improved S/N ratio of 3 dB.
Filter and attenuation
A switch located at the rear attenuates the sensitivity by 10 dB. When this switch is activated, the microphone accepts sound pressure levels up to 127 dB (equivalent to a sound pressure of 45 Pa) without distortion.
An additional switch at the rear allows to change the microphone's cutoff frequency. This reduces low frequency interference directly at the input of the microphone amplifier.
This setting also compensates for the unavoidable bass boost that occurs with all pressure gradient transducers when they are used at close distance (proximity effect).
The cardioid characteristic maintains a smooth frequency response at a distance of 30 to 40 cm, the figure-8 characteristic even at a distance of 15 to 20 cm.
Avalon VT-737SP Channel Strip
The Avalon 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 utilises 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 single 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.
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 utilises 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 utilises another dual triode vacuum tube driving a 100% discrete, Class A, high-current, balanced and DC coupled low noise output amplifier.
Avalon VT-737SP Specifications
Circuit Topology: Four dual triode vacuum tubes (Sovtek 6922), high-voltage discrete Class A
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: 1/4 inch jack 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: 482 x 305 x 89 mm / 19 x 12 x 3.5 inches
Weight: 10kg / 22lbs
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