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Rupert Neve Designs Portico 511 Mic Pre (Demo Deal)

Legendary preamp design complete with variable Silk/Texture control - for 500 Series
MFR# 511

Product Description

With a big, bold preamp and the flexibility of variable Silk/Texture, Rupert Neve designed the Portico 511 to combine classic sonics with 500 Series value. Incorporating the 517′s powerful preamp, the 5012′s universally useful sweepable high-pass filter, and the transformer-saturating power of a variable silk circuit derived from our flagship Portico II Channel, the 511 is a Rupert Neve-designed mic pre for the masses.

Designed for 500 Series by Mr. Rupert Neve

Rupert Neve: "While creating functional 500 Series modules is relatively simple, designing those modules to equal their non-500 Series counterparts with the current, voltage and space restraints is quite challenging. In creating our Portico 500 Series modules, we experimented with a number of different transformer and circuit designs to achieve the same presence and sweetness found in the Portico Series of modules. The result of these efforts is that outside of the slightly lowered headroom, our 500 Series modules are nearly indistinguishable from standard Portico Series modules, and are perfectly suited for studios of the highest caliber."

Input Section

Input signals may be derived from mic or line sources (make sure 48V is off for line sources!). The input has a 10K Ω non-reactive input resistance that handles a full 22dBu signal without the need for a pad. The preamp is a TLA non-reactive design that precludes the loading of microphones with limited driving capability. A primary gain control provides 66dB of gain in 6dB increments for easy recall, with a +/- 6dB trim for fine adjustment. For condenser microphones and powered DIs, there is +48V phantom power. A transient-optimized HPF continuously covering the range from 20-250Hz is included to tame rumble and proximity effect.

Texture

One of the key developments in the 511 is the Red Silk / Texture control from the Portico II Channel. Building on the “Silk” mode found in the Portico Series mic preamplifiers, Texture is designed to adjust the actual amount of harmonic music content from the source material, in effect, providing wide range of tonal options for the preamplifier. Like the original Portico Silk, the Silk Red / Texture works by reducing negative feedback on the output transformer and adjusting the frequency response to more closely resemble Mr. Rupert Neve’s vintage designs. With the 511, the Texture control allows these techniques to be pushed further than previous designs, adding about 10 times the desirable THD of the original silk control at the maximum setting.

With that said, we have taken great care to ensure that the musical integrity of source material itself will not be compromised by these harmonic controls (these are not to be confused with controls from other manufacturers that may “incinerate,” “demolish” or “destroy” source material), and we at RND believe they can be confidently modified to fit the personality of any song, instrument or engineer.

Low Noise, Low Distortion Operation

Much care was given in designing the 511 to produce as little noise and non-harmonic distortion as possible. Carefully implemented signal paths and Class A operation are a large part of the 511′s sweet, whisper quiet performance.

Why Transformers?

A complete discussion on transformers is out of place at this point, but it is helpful to review some of the essentials where it will be seen that a design needs to be viewed as a whole, not simply from the point of view of a single component.

The fine subtleties of circuit design relating to sonic performance are gradually becoming more clearly understood. For example, research has shown conclusively that frequencies above 20 kHz affect the way in which humans perceive sound quality. But, long before scientific evidence emerged a substantial body of musicians and engineers knew that equipment with apparently the same technical measurements could sound very different.

Incredibly small amounts of musically dissonant odd harmonics have a disastrous effect on the sound quality. Extraneous noise or interference that finds its way into a signal path seriously impairs performance of the whole chain.

Many control rooms make use of outboard gear that is not well protected from external signals. Poor grounding of such equipment can be a serious problem. “Electronically balanced” circuits much used in modern equipment, can give very good measurements on the test bench but they do not provide adequate rejection of the stray fields found in every working environment.

Input and output circuits must be freed from ground dependence so that only the “wanted” signal enters and leaves the processing path. Transformers are the ideal solution. The sweet and silky sound of my classic old favorite consoles was achieved with big transistors and large high quality transformers. Rupert Neve Designs Portico modules achieve similar quality today without the bulk or the cost.

In order that modules can work together as would be expected (i.e. in a proprietary console configuration) without producing hum, R.F. interference, or other interactions, the connecting interfaces, grounding, levels and impedances must receive careful attention. Each Portico module is a complete integral signal processor that delivers its specified performance independently. This is one of the reasons we use transformers.

Product Specifications

ConditionDemo / B-Stock
Tube or Solid StateSolid State
ChannelsSingle-Channel
ChassisModule
Module Type500 Series
Module Slot Count1 Slot
Direct InputNo
Digital I/ONo

Product Reviews

4.5 out of 5 stars.
Review Count (2)

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Awesome pre. On the cleaner side but it works great on any source. Some pres have a bit too much distortion for my liking and I find that this is a happy middle ground between having a vibeless track and "closing in" the sound because of too much color and distortion. The headroom is really great on this pre as well; I use it for R&B singers often where they swing from really loud passages to softer passages during the verse.

By Mickey on June 5, 2018

I have a pair of these with the 551 EQs and I love them. They are a more modern, clean sound than my real NEVE 1073LB and my 73 clones. The silk control does give it a little of the color of old school preamps - just not nearly as much. That said, I do not think that is negative. These pres are simply superb sounding and completely authentic to the original source. And for the price, I simply don't think there is a better 500 preamp available. I really like mine and think they are worth consideration for your rack.

By Sean R. on June 5, 2018

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