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Author Topic: Portico 5024 Quad Mic Amp  (Read 3003 times)

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Offline dactylus

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Portico 5024 Quad Mic Amp
« on: April 07, 2011, 07:44:04 AM »

 ;D

M-S
The M-S button engages Mid-Side decoding on channels 3 & 4. Channel 3 level controls the mid signal, and channel 4 level controls the side signal.


Portico 5024 Quad Mic Amp

http://rupertneve.com/products/portico-5024-quad-mic-amp/


Incorporating four channels of renowned preamplification, independent silk controls, two channels of DI inputs, and an M-S Decoder into a 1U enclosure, the 5024 is workhorse equipped to enhance the front end performance of any digital or analogue recording system. Each channel of the Portico 5024 is based around the custom transformers and class-A circuitry found in the 5012.

In addition to 72 dB of gain, the 5024’s mic pres include individually selectable phase, mute, phantom power, a selectable frequency high pass filter, and the Silk circuit which yields the rich warmth and presence of the renowned classic designs. Channels 1 & 2 of the 5024 feature a high-Z input designed for instrument level sources. Channels 3 & 4 feature an M-S switch, which enables Mid-Side decoding without the use of multiple console channels.

Microphone Input
The microphone input is balanced but not floating, being a variant of an instrumentation amplifer using a “Transformer-Like-Amplifier” (T.L.A.) configuration with a 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 +25 dBu input signal to be handled at unity gain without an input pad over the whole audio spectrum. This combines the advantages of both an “Electronically Balanced” and true transformer input. When the Phantom voltage is switched off, this input serves as a very high quality line input with an impedance of 10,000 ohms.

Low Noise, Low Distortion Operation
Much care was given in designing the 5012 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 5012′s sweet, whisper quiet performance. For more information, go to Mr. Rupert Neve’s Design Notes

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 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.
Silk
Much could be written about this feature, suffice to say, that it gives a subtle option to enhance sound quality in the direction of vintage modules. The Silk button reduces negative feedback and adjusts the frequency spectrum to provide a very sweet and musical performance. We suggest you try it and make your own judgment.

M-S
The M-S button engages Mid-Side decoding on channels 3 & 4. Channel 3 level controls the mid signal, and channel 4 level controls the side signal.

Instrument Inputs
Balanced or unbalanced Hi-Z input for instruments using the Mic Pre's gain circuitry.

Level Meter
-30 dBu to +22 dBu With reference to the output

Mute
Cuts of the output signal post metering and pre Buss Output. Be sure to mute the outputs before engaging phantom power.

High Pass Filter
The High pass filter is a valuable aid in any signal chain but particularly so in a microphone preamplifier. Signals below 30 or 90 Hz can be attenuated at 12dB / Octave, leaving the range above this unaffected. This gets rid of building rumble, air handling motor hum etc.

Phantom Power
Provides 48V phantom power to microphones

Phase Inverts
Flips the phase of an incoming source 180 degrees

Portico 5024 - Quad Mic Amp

hot licks > microphones > recorder



...ball of confusion, that's what the world is today, hey hey...

Offline dactylus

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Re: Portico 5024 Quad Mic Amp
« Reply #1 on: April 07, 2011, 04:01:22 PM »


I just spoke with a Rupert Neve sales rep.  The 5024's are just starting to ship.

Dimensions are:  1.75" H  X  19" W  X  9" D

Street price for the 5024 ~ $3,100.00

Powered via AC input only

I think that building a Tekkeon battery fueled AC power supply for this unit this would be a great next project for H²O.

hot licks > microphones > recorder



...ball of confusion, that's what the world is today, hey hey...

Offline JasonSobel

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Re: Portico 5024 Quad Mic Amp
« Reply #2 on: April 07, 2011, 07:21:22 PM »

Powered via AC input only

I think that building a Tekkeon battery fueled AC power supply for this unit this would be a great next project for H²O.

if you wanted 4 channels of neve pre-amps, wouldn't it be a lot easier to just get two Portico 5012's.  Those are DC powered, so much easier to take in the field.
and while I might be wrong, my guess is that the Portico 5024 is the guts of two 5012's inside one body.  maybe with a few minor differences.

Offline Myco

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Re: Portico 5024 Quad Mic Amp
« Reply #3 on: April 07, 2011, 08:57:41 PM »
I think it's time for a pre-amp intervention David.  ;)
Microtech Gefell M200: M20/M21/M27 caps> Bumblebee MiAGi-II/Darktrain silver cable's/"Chuck" Belden cables> Aerco MP-2 or Busman modded DR-680 pre-amps> Darktrain cables & interconnects> Tascam DR-680 (Busman mod)
AT853's(card's/hyper's)>AT8533x>Aerco MP-2>Sony M10

Offline dactylus

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Re: Portico 5024 Quad Mic Amp
« Reply #4 on: April 08, 2011, 06:47:47 AM »

Powered via AC input only

I think that building a Tekkeon battery fueled AC power supply for this unit this would be a great next project for H²O.

if you wanted 4 channels of neve pre-amps, wouldn't it be a lot easier to just get two Portico 5012's.  Those are DC powered, so much easier to take in the field.
and while I might be wrong, my guess is that the Portico 5024 is the guts of two 5012's inside one body.  maybe with a few minor differences.

Yes, it would be cheaper/easier to me acquire a second 5012.  Yes the 5024 is basically two 5012's inside of one housing with the exception of two channels of DI inputs, and an M-S Decoder for ch3 & ch4, but with the 5024 all 4 channels would be in one wider box...   I'm just saying.   ;)

« Last Edit: April 08, 2011, 06:49:20 AM by dactylus »
hot licks > microphones > recorder



...ball of confusion, that's what the world is today, hey hey...

Offline yug du nord

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Re: Portico 5024 Quad Mic Amp
« Reply #5 on: April 08, 2011, 08:16:18 AM »
^Quit dreamin dude........  unless you finally found that nimble, nordic sherpa to haul your gear bag around.   ;) ;)  If that gear bag gets any heavier, we'll have to start bringing the bands to you.   ;) ;)
.....got a blank space where my mind should be.....

Offline Myco

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Re: Portico 5024 Quad Mic Amp
« Reply #6 on: April 08, 2011, 09:37:45 AM »
^Quit dreamin dude........  unless you finally found that nimble, nordic sherpa to haul your gear bag around.   ;) ;)  If that gear bag gets any heavier, we'll have to start bringing the bands to you.   ;) ;)

I hear the same thing.  :yack:  I consider part of my taper workout regimen.
Microtech Gefell M200: M20/M21/M27 caps> Bumblebee MiAGi-II/Darktrain silver cable's/"Chuck" Belden cables> Aerco MP-2 or Busman modded DR-680 pre-amps> Darktrain cables & interconnects> Tascam DR-680 (Busman mod)
AT853's(card's/hyper's)>AT8533x>Aerco MP-2>Sony M10

Offline tgakidis

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Re: Portico 5024 Quad Mic Amp
« Reply #7 on: April 09, 2011, 03:57:49 AM »
Time to start  a new fitness club for tapers.
GAKables: Custom XLR, Digi & Batt Cables http://taperssection.com/index.php?topic=133186.0

Mics: Telefunken RFT AR-51 / Telefunken ELA M 260 (tk60,tk61,tk62) / Telefunken M60 / AKG c426b / AKG c414 xls / AKG c414 B-XLS / AKG c460b (ck61,ck62,ck63,ck69,a60,ck1,ck22,ck3,ck8,Blue B6) / nBob AKG Actives>PFA/ nBob AKG Actives>nBox Platinum / Naiant AKG Actives>PFA / AT853 w/ 4.7k Mod (Card,Omni,Sub)
Pre-Amps: Sonosax SX-M2 / Lunatec V3
Recs: Sound Devices MixPre-10T / Sound Devices MixPre-6 / Sony PCM-M10 / Roland R-07

My Recordings: https://archive.org/search.php?query=taper%3A%28Gakidis%29&sort=-date

 

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