PS Audio Stellar Phono phono preamplifier Specifications

Sidebar 1: Specifications

Description: Solid-state phono preamplifier with unbalanced inputs and both balanced and unbalanced outputs. Overall voltage gain: MM: 44dB, 50dB, 56dB. MC: 60dB, 66dB, 72dB. Input loading: MM: 47k ohms (100pf). MC: 60, 100, 200, 47k ohms, Custom, 1 ohm–1k ohms. Output impedance: unbalanced <200 ohms, balanced <200 ohms per leg. (All measurements are with both channels operating, gain set to low, and balanced outputs. Input frequency is 1kHz.) Frequency response: 20Hz–20kHz ±0.25dB. THD @0.5V, 1kHz: <0.01%. Maximum output: @1%THD: 24VRMS. Overload margin: @1kHz: >22dB. S/N ratio MM: >82dB A-weighted. MC: >74dB A-weighted. Channel separation >74dB.
Dimensions: 17" (430mm) W × 3.25" (82.5mm) H × 13" (330mm) D. Weight: 21.6lb (9.8kg).
Serial number of review samples: SPH-A-9G0363 (listening), SPH-B-9J0100 (measurements). Designed and assembled in the US.
Price: $2499. Approximate number of dealers: Sold direct.
Manufacturer: PS Audio, 4865 Sterling Drive, Boulder, CO, 80301. Web: psaudio.com.

COMPANY INFO
PS Audio
4865 Sterling Drive
Boulder, CO, 80301
ARTICLE CONTENTS

COMMENTS
Ortofan's picture

... a subsonic filter?

Do the various EAT E-Glo hybrid phono preamps exhibit an "overexposed" sound quality with "far too much high-frequency energy" and "a grey sheen"?
Consider the Petite model that costs $1K less than the Stellar:
https://www.absolutesounds.com/pdf/main/press/HFN%20Feb%20EAT%20E-Glo%20Petite%20Reprint[1].pdf

georgehifi's picture

At least it's not a few opamps like many are, though this board looks fairy well stuffed.
https://www.analogplanet.com/images/styles/600_wide/public/0419DM.JPG

Cheers George

JRT's picture

It is not easy to exceed the performance of some of the best monolithic operational amplifiers when properly implemented in a circuit.

The now obsolete (shame on you Texas Instruments) TI / National Semiconductor LME49990 was truly excellent for many uses in audio circuits.

LME49990 datasheet:
https://upverter.com/datasheet/7cd4a4f0b32df3909631d7b5fda12936b94811b9.pdf

Jack L's picture

.....monolithic operational amplifiers when properly implemented in a circuit." quoted JRT

Chip op-amps? Thanks but no thanks.

First off, We have to know an op-amp is built up with MANY bipolar junction transistors with built in feedback loops all over.

So however immaculate measured data published only show the STATIC performance working on sine/square waves test signals in the lab. But when used in audio amps to handle music signals which are for ever fluctuating DYNAMIC complex multi harmonics. It will be another story!

The published static performance data do not show how the op-amp in question will operate with dynamic music complex harmonics at all !!!!!!!!

Logic will tell the huge number of bipolar transistor junctions & the feedback loops inside the op-amp chip the complex music harmonics have to pass through, only cause harmonic & phase distortion to the music complex harmonics, substantially compromising the music sound quality. This is physics.

My critical ears just can't tolerate the clinical sound of any op-amps. Period.

Listening is believing

Jack L
Canada

hollowman's picture

It's good to see such an extensive Measurements section for a phono component. I don't recall Stereophile ever publishing THIS many measurements before. In fact, I only recall the late Audio (USA) magazine publishing this many phono metrics in their reviews.

Jack L's picture

...... a phono component." quoted hollowman.

Measurement however "extensive" can never tell how it will sound to our ears. So let yr ears have the final say !!!!!

Jack L

Anton's picture

This review generated hobby excitement for me.

I could see this or the Mu Fi Nu Vinyl being a good foundation for a 20 year system.

davip's picture

Capacitance switching for that MM input -- an extraordinary omission for "...a product that will stand or fall on its own merits, regardless of price", particularly when money is wasted on a useless feature like remote gain-switching...

JRT's picture

Pass Labs XP-27 product marketing web page:
https://www.passlabs.com/preamplifier/xp-27

Product specifications:
https://www.passlabs.com/sites/default/files/Product_specs_17_27.pdf

Owner's manual:
https://www.passlabs.com/sites/default/files/xp-27_om_prelim.pdf

It still needs a good AD converter to get your FLAC files onto the server. I would suggest an RME ADI-2 Pro FS. It was on sale for $1499 in a few months prior to 2020, and you might still find it for that, but be sure that it is the newer FS variant. It is also a good DA converter and headphone preamplifier, so has other uses in the system.

RME ADI-2 Pro FS marketing web page on the new poorly done website:
https://www.rme-audio.de/adi-2-pro-fs.html

RME ADI-2 Pro FS marketing web page on the older and better, but now archived website:
https://archiv.rme-audio.de/en/products/adi_2-pro.php

User Manual, includes section with product specifications, and includes a section describing and showing advantages of digital volume control when properly implemented.
https://archiv.rme-audio.de/download/adi2profs_e.pdf

Glotz's picture

The Stellar is $2500.

Ortofan's picture

... short shrift in many modern preamps.

The venerable Apt Holman preamp offered adjustments for both load resistance and capacitance - plus a switchable subsonic/infrasonic filter.
https://www.kenrockwell.com/audio/apt/images/holman-preamplifier/D3S_5281-back-1200.jpg

Michael Fremer's picture

Most buyers will end up using MC cartridges. The fixed capacitance is probably fine for most MM cartridges too.

Bill Leebens's picture

...for an extraordinary, heartfelt review.

One thing I notice from most of the comments—thanks, Anton, for being the exception—-can’t we focus on what is right, rather than constantly pissing on good work? Celebrate what it is, rather than diminishing it by saying it should have been something else?

Have any of these folks ever agonized over a design as Darren did for a year, working to ensure that a brilliant prototype became an amazing piece in production??

I love audio, its designers, and the people who devote their energies, heart, and soul to it.

Armchair experts? Not so much.

Ortofan's picture

... offend you. If, in your opinion, this magazine or its website should only contain positive comments, then it becomes no more than a cheerleading section or a form of advertising.

In my several decades long experience of designing and developing products, prototype units have always been submitted for evaluation by focus groups and/or field tests. Feedback - both positive and negative - is reviewed and changes are incorporated as necessary and where feasible.

Did PS Audio conduct any outside testing? It seems as though the design was deemed complete once it met Mr. Myers "one note" criteria. Who determined the feature set for this product? Had PS Audio solicited my input, I would have suggested eliminating the remote control and including adjustable resistive and capacitive loading for fixed-coil/high-output cartridges. While the remote control selection of MC cartridge loading might constitute a 'unique selling proposition', the load only needs to be set once for any given cartridge. The unit already has separate inputs for MC and "MM" cartridges. How much more would it have cost to include a pair of switches and a few extra resistors and capacitors to enable adjustable loading for the "MM" input?

Glotz's picture

Their negativity is a result for a simple desire to be noticed.

We are all bigger than that.

Bill Leebens's picture

There are always a number of outside evaluators of proposed/new products at PS. Beyond that, I shouldn’t comment further as I’m no longer with the company.

I’ve probably already shot my mouth off wayyy too much.:-)

Catcher10's picture

For me and my Lyra Delos at 0.6mV, only need about 56-57dB to match my preamp input sensitivity. My Nova II is set at 56dB and anymore I could be over loading.
I don't understand the need for so much gain for MC carts....Starting at 60dB does me no good.

Jack L's picture

...... with a phono preamp that always presents the music in the correct light." quoted Michael Fremer.

Both JFET & MOSFET devices are nonlinear devices with transfer curves
kinked sharply, leaving the linear ohmic operation zone pretty narrow for linear music signal swings, even more nonlinear than bipolar junction transistors.

Like it or not, ONLY truly linear active device which exhibits linear transfer curves is triode vacuum tube. period.

That explains why critical ears, like yours truly's. can distinctly tell amps employing triodes only active devices sound so much more musical than solid state amps.
But please forget the measurement data which, IMO, bear little relevance, if any, to what our ears perceive.

Mind you, not all tubes are as linear. Pentodes & tetrodes are nonlinear like JFETs & MOSFETs, also with kinked transfer curves, but the ohmic linear tranfer zones there are much milder & wider than their solid states counterparts. So more musical friendly than sold state devices.

Yes, passive RIAA EQ is the better EQ topology than conventional active
RIAA EQ which employs some feedback loops across active stages.

Listening is believing

Jack L
Canada

RHM's picture

All fets used in linear amplifiers are operated in the saturation region (nearly horizontal lines), not in the ohmic region (sloped lines starting at zero), similar to the way pentode vacuum tubes are used.

The fet ohmic region is used for analog switches, not linear amplifiers.

Jack L's picture

........the saturation region (nearly horizontal lines).." quoted RHM.

If you read carefully the tranasfer curves of MOSFET. for example, the kink or the "knee" of each curve line is far from being SQUARE (which is ideal), but rounded off instead. So the sorta "horizontal lines" are hardly horizontal at all. They are tilted upward towards the right. Much much worse than a pentode or tetrode.

So designing the operation points of a FET type bipolar devices has to be very careful assuming there would not be thermal runaway during operation.

So my question: why FETs have been chosen for the amp in the first place?

Jack L

RHM's picture

Fets have an essentially square law transfer characteristic (and hence mostly second order harmonic distortion), and have especially low THD in a push-pull circuit which cancels the second harmonic.

All power devices (triodes, pentodes, fets, bipolars) have their own advantages and disadvantages; none are perfect. All types can designed into circuits which work well.

Jack L's picture

..... (and hence mostly second order harmonic distortion)" quoted RHM.

Sorry, I disagree.

Pentodes generated mostly 3rd harmonic & hiher odd harmonic distortions. Only beam tetrode, e.g. 6L6, KT66, generate mainly 2nd harmonic distortion like triodes.

Like it or not, human ears like listening to 2nd harmonic & higher even
harmonics but dislike odd harmonics.

Push-pull power output topology delivers more power but cancels out even order harmonics. Critical ears can detect it. That's why single ended
class A power output design using triodes which produce mainly 2nd & higher even harmonics pleases our ears most.

Thanks to my being addicted to analogue music (owning 1,000+ vinyl LPs), my acute ears can differentiate triode sound from beam tetrode or pentode distinctly. FET type bipolar junction devices can't even come close to any tubes sound, let alone triodes.

FYI, I design/build audios. My home-brew 2A3 single-ended Class A power amp (9W+9W) (without any loop feedback ) sounds so real musically that I just can't tolerate any other output devices. Why, because 2A3 is a filament-direct-heated triode, no other tubes, like beam tetrodes, pentrode (which are all cathode-indirect-heated) can touch musically, let alone any bipolar juncrtion devices.

Love of music + design knowledge = great music enjoyment AFFORDABLY.

Listening is believing

Jack L

Glotz's picture

"Meyers designs using a deft combination of technical knowhow and careful listening, more interested in the sonic outcome than in getting the absolute best measured performance. In my view, that's a winning combination."

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