Rupert Neve Designs 5051 Shelford Inductor EQ and Compressor

Rupert Neve Designs 5051 Shelford Inductor EQ and Compressor

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The 5051 combines a classic three band EQ based on Rupert’s vintage designs with the power and flexibility of the Portico II compressor. Utilizing a fully-discrete, class-A signal path and high performance input and output transformers, the 5051 delivers the performance and musicality expected from a Rupert Neve Design.
The EQ design on the 5051 evokes sonic similarities with some of Rupert’s classic EQs. The 5051 uses a custom tapped inductor with selected capacitors to form the mid range equalizer band, and the shelf curves are based on Rupert’s vintage modules, including very similar frequency choices. Each EQ section also uses low feedback class-A discrete electronics to prevent low level artifacts and harshness from detracting from the tonal shaping. The EQ, however, is a modern design with advantages offered by techniques that were not possible 35 years ago along with improvements in electronic components currently available, and should not be considered a clone. Let’s just say it has heritage.

Rupert Neve Designs 5051 Features:

  • MIC GAIN
    A 12-way precision rotary switch controls gain from 0 to 66 dB in 6 dB steps.
  • TRIM
    Continuously variable +/-6 dB level control.
  • +48V
    Engages phantom power on the microphone input, as supplied by the 500 series rack.
  • POLARITY
    Push button inverts the polarity of the signal path, and illuminates when engaged. The symbol “Ø” is often used to denote opposite polarity.
  • HIGH PASS FILTER
    The high pass filter is continuously variable from 20-250Hz and engaged by the HPF switch, which illuminates when engaged. It is a valuable aid in any signal chain, but particularly so in a microphone preamplifier. Signals below the selected frequency are attenuated at a rate of 12db / octave, getting rid of proximity effect, building rumble, air handling, motor hum, etc.
  • SILK / TEXTURE
    Pushing the Silk button engages the red Silk circuit, which reduces the negative feedback on the output transformer, adding harmonic content as the texture is increased. Red Silk accentuates the saturation in the mid and high frequencies, similar to that of the red silk mode on the Portico II Channel. By manipulating the Texture control, the amount of Silk can be changed from essentially absent, to roughly 10 times the amount of coloration / distortion found in Silk from the original Portico Series. With Silk / Texture engaged, the distortion characteristic and harmonic content of the unit are very reminiscent of many of Rupert’s class-A vintage designs.
  • LEVEL METER
    An Eight-segment LED bar-graph meter displays output level (pre-Silk). The color range proceeds from green for lower level signals, yellow for intermediate signals, and red for high levels. When the 511 is clipped, the highest red LED will hold longer depending on how far above the clip threshold the signal was.

Rupert Neve Designs 5051 Specifications:

  • Frequency Response:
    Main Output, no load, –3 dB @ 2.5 Hz
    –3 dB @ 125 kHz
  • Noise:
    Measured at Main Output, unweighted, 22Hz-22kHz, Terminated 40 Ohms, With gain at unity
    better than –102 dBu
  • Maximum input:
    from 20 Hz to 20 kHz, +25 dBu.
  • Maximum output:
    from 20 Hz to 20 kHz is +25 dBu. Total Harmonic Distortion and Noise: from <10 Hz to 80 kHz,
    @ 1kHz, +20 dBu output: Better than 0.002% @ 20Hz, +20 dBu out Better than 0.120%
    13
    @ 20kHz, +20 dBu out Better than 0.010%
  • Maximum input:
    from 20 Hz to 20 kH, +24.5 dBu
  • Maximum output:
    from 20 Hz to 20 kHz, +24.5 dBu
  • Total Harmonic Distortion and Noise:
    from <10 Hz to 80 kHz, @ 1kHz, +20 dBu output: Better than 0.007% @ 20Hz, +20 dBu out Better than 0.120% @ 20kHz, +20 dBu out Better than 0.070%
  • The Compressor
    (Threshold at +20 dB, Ratio at 1.1:1, Gain at 0)
  • Noise:
    Measured at Main Output, unweighted, 22Hz-22kHz, Terminated 40 Ohms.
    Better than –92 dBu
  • Maximum input:
    from 20 Hz to 20 kHz, +25 dBu.
  • Maximum output:
    from 20 Hz to 20 kHz, +25 dBu.
  • Total Harmonic Distortion and Noise:
    from <10 Hz to 80 kHz @ 1kHz, +20 dBu output: Better than 0.020% @ 20Hz, +20 dBu output Better than 0.140% @ 20kHz, +20 dBu output Better than 0.070%
  • Power Supplies
    25-Way Power Supply (2U)

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