Neve Portico 5012 Preamplificatore Microfonico

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Descrizione

A single RND 5012 comes with a Power Adaptor (Part # RND 5100) that will work from virtually any public Mains supply world-wide. The Power Adaptor is designed to power two modules.

A U.S. type power cord (Part# RND 5110) is also supplied when ordered direct from Rupert Neve Designs. A different power cord would be supplied if ordered from an overseas distributor or if specified at the time of ordering.

When two 5012 modules are ordered together, a Linking Kit (Part # RND 5221) and a Power Linking cord (Part # RND 5122) will be supplied free of charge. For quantities greater than two, please consult Technical Sales for the best way to mount and power multiple Portico™ modules. Many powering options are available. Portico modules actually require any external DC supply from 9 volts to 18 volts. 

Modules can be daisy-chained so that, for example, a group of RND 5012's in a flight case could work for many hours off a 12volt car battery without any limitations of performance - ideal for field work.

THE RND PORTICO™ RANGE OF MODULES (OR 5,000 SERIES) IS DESIGNED TO FORM AN INTEGRATED MODULAR CONSOLE SYSTEM THAT MAY INCLUDE MODULES ALREADY ON HAND IN THE CONTROL ROOM.

These may include high quality vintage modules and their modern equivalents manufactured to my original specifications.  

In order that modules can work together as would be expected, for example, in a proprietary Console, 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 processor that delivers its specified performance independently.  This is one of the reasons we use transformers.

WHY TRANSFORMERS?

A complete discussion on transformers is out of place at this point but a technical discussion will be posted at a later date. Here 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 20kHz 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 nevertheless sounded 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 real problem. “Electronically balanced” circuits much used in modern equipment, can give very good measurements on the design bench but they do not provide adequate rejection of the stray fields that are 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.

IS IT “CLASS A” ?

What is “Class A”? It’s not just an expression of “goodness” that has been used carelessly to describe every kind of amplifier from consumer electronics to Pro Audio. Class A is actually a mode of operation in which the supply current to the amplifying device does not vary as a function of the amplitude of the signal being amplified.

Efficiency of Class A amplifiers is low. But the wonderful sound of my old consoles was achieved with single sided pure Class A amplifiers. In those days Console features, facilities, tracks, Aux's etc. were far fewer and we could shoehorn these large, heat generating circuits into the module.

The ever increasing complexity of modern Sound Control Consoles led to the widespread use of Integrated Circuits (I.C.s) to save space and achieve better efficiency. I.C.s are almost all push-pull amplifiers that have some residual crossover distortion. Some have very low distortion but even when this is well below the noise level, it can influence the sound we hear.

Humans can detect incredibly small values of this type of high order distortion. It’s not heard as such but causes emotional feelings of dissatisfaction and fatigue. The only way to totally eliminate crossover distortion is to use a Class A single sided amplifier. This can only be achieved using discrete components. The efficiency is low but the sonic advantage has been proven over many years.

Portico™ modules are very carefully configured to be as simple as possible but sonic integrity has been given the highest priority. The low efficiency of these discrete circuits is reflected by the high supply current required by Portico™ modules!

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Scheda Tecnica

Input:
Balanced, using “Transformer-Like-Amplifier” (T.L.A.) with toroidal Common Mode Rejection Low Pass Filter that excludes frequencies above 150 kHz.
The T.L.A. is followed by an actual input transformer permitting a full +26 dBu input signal to be handled at unity gain without an input pad over the whole audio spectrum.
Combines the advantages of both an “Electronically Balanced” and true Transformer input.
When the Phantom voltage is disabled, this input serves as a very high quality Line Input.
Input Impedance:	10,000  Ohms  + or – 20%
Noise:
Measured at Main Output:	Input terminated with 150 Ohms.
Measured over band limited 22Hz-22kHz, Unweighted:	With Gain at Unity:	Better than –100 dBu.
	With Gain at 66 dB:	Better than –62 dBu
	Equivalent Input Noise (E.I.N.)	Better than –128 dBu
Frequency Response:
Main Output, no load:	@ 10 Hz,	–0.2 dB
	@ 160 kHz	–3 dB
Buss Output
measured at the RND 5014  Buss-mixer, Monitor Amplifier Output:	@ 10 Hz	–0.2 dB
	@ 160 kHz	–3 dB
High Pass Filter:
Swept Frequency continuously variable from 20 Hz to 250 Hz.	Slope:	12 dB/Octave.
Gain:
Switched Gain from Unity to +66dB in 6 dB steps.
“Trim”:
Continuously adjustable potentiometer from –6dB to +6dB with reference to setting on the Gain Switch.
Maximum Output Level:
Balanced and Floating Transformer Output from 20 Hz to 40 kHz:  +25 dBu. (Clips at just over +26 dBu)
Mute:
Mutes Main Output only.  (i.e. Monitor remains “Live”)
Total Harmonic Distortion and Noise:
Main Output	@ 1kHz, +20 dBu output level, no load:	Better than 0.001%. (No high order Harmonics)
Silk Engaged:	Approximately 0.2% Second Harmonic
Main Output	@ 20Hz, +20 dBu output level, no load:	Better than 0.01%.
Buss Output	@ 1kHz, +20 dBu output level, no load, measured at the RND 5014  Buss-mixer, Monitor Amplifier Output:	Better than 0.002%.
SILK FEATURE:
The RND 5012 uses mainly single-sided amplifier circuitry that excludes any possibility of crossover distortion. The “SILK” button reduces negative feedback and adjusts the frequency spectrum to provide a very sweet and musical performance.
Buss Output:
The Buss Output is designed to feed the 5014 and other Portico™ Series modules with Buss Inputs.
Crosstalk:
Measured Channel to Channel:	Better than –90 dB @ 15kHz.
Phantom Power:	+48 Volts DC +/– 1%
Main Power Required:  (From External Power Unit)	Voltage Range,	9 to 18 Volts DC.
Current consumption:	@ 9VDC = 1.3 A typical
	@12VDC = 1A typical
	@15VDC= 800 mA typical
	@18VDC= 650 mA typical
Rear Panel Power Connector:	5.5mm X 2.1mm DC jack, Center Positive