Review: A Tale of Two Schiits - Mani 1 vs Mani 2 phono preamp

(photo from Schiit)

I've been using the original Schiit Mani 1 phono preamplifier for some time.  Its sole purpose has been to provide the needed amplification and equalization for my second turntable, the Dual CS5000.  It has done well plugged into the line section of the Audio Research SP8, which has a phono section that is used for the primary turntable, a Thorens TD309.

To be fair, the Mani is a budget phono stage so I could put up with the slight graininess, mid-fi resolution, and the general lower fidelity.  For all the Mani 1's faults, it is still better than a lot of stock phono sections found in budget receivers, preamps, and integrateds.  And given the mostly background music it was used for I had no complaints.

A recent visit to the Schiit Audio site and I saw that a second version of the Mani has been released, this one using a different op-amp and it was also direct-coupled.  The case looks exactly the same but the dip switches on the bottom have changed, allowing more settings for MM and MC cartridges.

To cut to the chase, compared to the old version, the new Mani 2 is more detailed, faster, has better resolution, deeper bass, and higher overall fidelity.  It also images, left-to-right in a fashion that will be most pleasing.  It isn't perfect - nothing is! - but it does swing at a higher than the $149 (black face model) price point suggests.

Where the Mani 2 ultimately fails - compared to the Audio Research SP8 or the Classe Five - is inner detail and that certain "you are there" magic that I've heard with these more expensive units.  The soundstage of the former is also flatter without that depth I've come to expect.   However, to be fair. the Mani 2 does strike awfully close to better preamps making my budget Dual CS5000 sound a lot closer to the combination of Thorens TD309 and the ARC SP8 phono stage.  Depending on your front end, amps, and speakers, this difference may not matter at all.

 As always your mileage may vary depending on your front end, setup, and preferred listening habits.

System:

• Dual CS5000 with Ortofon OM20 and an aftermarket Shibata stylus
• Thorens TD309 with Ortofon 2M Bronze
• Audio Research SP8 with vintage Mullard 12AX7s 
• Eico ST70 "Frankenstein" amplifier with 6AR6 output tubes
• KEF R500 speakers
• MIT interconnects
• Cardas Twinlink speaker cables
  

Project: Restoring a Audio Research SP-8 preamplifier

 A recent purchase was this Audio Research preamplifier that sadly is in need of repair.  All original early 80s, it will need a cap job, a new volume control, and a solid-state regulator supply fix.  More later!

A Very Brief Review of the Schiit SYS

I bought this little $49 passive preamplifier to use in a CD-only garage stereo system.

For fun I plugged it between the Schiit Mani phono preamp and the Aleph J amplifier, using the cheaper of my turntables, the Dual CS5000 as source. The SYS sounds really nice. There is that slight lack of drive I've heard before with passive preamps but detail and transparency is extremely good.  None of that (minor) JFET darkness of the Classe either. I should try the Schiit Mani/SYS combination out with my Thorens TD309 but that will have to wait for another day.

For the price, it's a steal and would work wonders in simple system.

Review: Classe Five preamplifier

 
Introduction:
Given my heavy valve past going with an upscale solid-state preamplifier was a difficult choice.  Though certainly not a heart-wrenching one as I do have more recent experiences with Threshold, Adcom, and even some homebrew gear.  And since I was considering going all separates, different preamps for both phono and line, my choice to buy a full-function Classe 5 may also be a puzzling one.

Classe, however, is one of those companies that have been on my radar ever since I was a twenty-something reading Absolute Sound and Stereophile.  Back then Classe was considered very "tube-like" and warm, completely opposite to the common complaint of much solid-state gear: harsh or strident, especially in the treble region.  Such descriptions, like the warm sound of early Mac SS gear, piqued my interest.  But since I was a poor college student, living on a diet of vintage tube amps, Mac 'n' Cheese, and $2.99 records, anything in the price range of a Classe DR-5 or DR-6 preamplifier was unthinkable. So instead I soldiered on with DIY gear, plenty of Dynaco PAS preamps, and an Eico HF-85.

Well doesn't time fly?  Perusing through the Audiogon ads, I saw a recently listed Classe Five preamplifier.  It had a phono stage, switchable from MM or MC cartridges, and even a remote control.  Their isn't much information out there on the Five but some search engine sleuthing and I found it is essentially an upgraded 1990s version of the original DR-5.  It also features balanced (XLR) or single-ended (RCA) outputs; a single set of balanced inputs too if I ever needed them.  The XLR outputs will come in very handy for my planned bridged ACA amplifiers that are being built sometime very soon.

With the price being right, I put an offer in and it was accepted.  Given the proximity of the seller, I received the preamplifier the next day.  Unpacking the Classe Five and I found myself with a very heavy duty unit that was nearly flawless.  The switches, which have a wonderful tactile feel, worked perfectly, as did the remote control and the various knobs.  The wireless remote has buttons that causes little motors on the volume and balance to physically turn the knobs.  Very neat (I'm still an adolescent at heart!).  This is also great for adjusting the gain to get that perfect playback level from the comfort of my favorite listening chair.

Initial Impressions:
It is always exciting to listen to something new - but the Five wasn't exactly earth shattering.  The sound was dark, a bit muffled, and seemingly missing some bite on the top end.  Bass, however, was controlled and the overall sound was smooth.  With only an hour or so of time, I went to bed, leaving my new preamplifier in standby mode since there is no power off button.

The next day, after work, I heard an improvement in sound.  The smoothness was still there but everything sounded a lot more cohesive.  I fought the urge to do any serious listening, waiting for a quiet Sunday afternoon where I could experience the Classe Five without any familial distractions.



In my doddering middle-age I've become a bit of a Chet Baker fanatic, even exploring his musical output beyond his 1950s heyday.  Nonetheless I still have an appreciation for his signature album, Chet.  It's a brooding masterpiece that has the fingerprints of Bill Evans all over it.  Listening to this album - 1980s Riverside pressing - reveals a lot more detail than I was hearing through the Adcom GFP-555.  The Classe Five does a better job of revealing the light cymbal work, which sounds deeper in the soundstage but with the attack and decay being more apparent as is the metallic nature.  Too many systems turn cymbals into a hard SHHHH noise, instead of the shimmering, complex sound it should be.

Instrument - piano, the brass instruments, and drum - have a more natural body than my old preamplifier.  The overall sound is very smooth but doesn't inhibit the more aggressive tones of the music.  It is a different type of smoothness than I ever heard; not imbued with a golden hue like a vintage tube preamplifier but more as if the sonics were cut from a single, grain-less cloth. 

Willie Nelson has a rich and immediately familiar voice.  On Stardust, the vocals come across as completely natural with just a hint of studio reverb added.  The instruments remain firmly behind the singer, reproducing the very intimate nature of this album.  Tonality is some of the best I heard, exceeding my expectations given the budget nature of the speakers and my turntable and cartridge. Cohesiveness is another word that came to mind, and one that kept popping up as made notes.  No single instrument seemed crowded out while another took the center of attention.



For something more dynamic, I turned to one of the greatest live blues albums ever recorded: Drinkin' TNT 'n' Smokin' Dynamite which has an all star backing band behind Buddy Guy and Junior Wells.  The Classe Five captured the audience background noises allowing me to place them in location and distance from the stage.  The dynamic shifts, given the limitations of the Wharfedale Denton speakers, were impressive; never sounding bloated or blurred.  An example of this is the stuttering starts and stops of the lead guitar, along with the deep bass foundation.  Each instrument had its own space but jelled together as one whole, making for a very toe-tappin' experience.


After that good time, I needed a melancholic change of pace.  Richard and Linda Thompson deliver this in spades with their album Shoot Out the Lights.  Linda's voice is sublime here, all barely hidden pain while the barbed wire guitar of Richard grinds away as if stripping the heart out of his troubled marriage.  His backing vocals sit separate from hers, as if he is giving his ghostly agreement.  This album, needless to say, a heart-wrenching series of songs.  The Classe Five does an excellent job of baring these emotions.





I listened to several other albums of varying quality - like The Fixx, Wardruna, The Police, and even some old 1930s-era Billie Holiday.  Poor recordings sounded like, well, poor recordings.  And mediocre ones weren't given any extra magic either.  The Classe Five appears to be rather neutral, low in coloration, and even-handed.  This one is a keeper.


Takeaways:

The Classe Five has the best treble I have ever heard from a solid-state preamplifier.  At first I thought it was rolled-off; lacking in air and excitement.  However further listen revealed that it is actually a lack of glare and edginess that is often common in lesser solid-state gear.  If a recording is bright, you will hear that.  If it is dull, or poorly recorded, that will be revealed.  There is no heavy coloration going on here.

Along with this natural treble comes the feeling, from top to bottom, that all frequency points are sonically similar; that is to say no part of the sound, be it treble or bass, sticks outs or draws attention to itself.  As I mentioned above, everything is cut from the same sonic cloth.  It's something I never quite heard to this degree with any preamplifier that I've ever owned and took some time to understand this new experience.  A similar situation occurred when I first heard the VPI Aries 1, only then did I hear the warble and background rush of lesser turntables.

Bass control is excellent - tight and dynamic without any bloat or smear.  This is essential for providing the foundation of the song.

Detail is very good; though some listeners may prefer a more hyper detailed presentation.  Perhaps this is the limitation of my front-end or the nature of the Wharfedale speakers.  Some future upgrades will see how well this holds true.

The quality of the Classe Five makes me question, to some degree, my allegiance to valves.  At least with valve gear you can roll in different tubes to find the best match with your system.  But, if you're tired of buying high priced NOS valves or even new stock, then give the Classe Five a try. You may be surprised.


System:
Adcom GFA-545 amplifier
Dual CS5000 turntable with Ortofon OM20 phono cartridge
Pioneer DVD-V7400 DVD player
Kimber 8PR/4PR bi-wire speaker cables
various budget interconnect cables

Building a new Dynaco PAS-3 tube preamplifier

The existing Dynaco PAS preamplifiers are now all getting a little long in the tooth - with a history that goes back to the Golden Age of stereo, this simple circuit has provided many of an hour of audio enjoyment.  Sure there are more transparent and detailed units out there, along with newer products with better reliability.

But I do have many fond memories of the Dynaco PAS - the first time I heard Quad ESL-63s, and with surprising results coupled with a simple Mosfet amplifier from Stereo Cost Cutters driving a pair of Wharfedale Diamond V speakers.  Both had huge soundstages - both in depth and width - along with a thoroughly musical presentation.  In an effort to capture those glory days, I decided to give this preamplifier another whirl, but this time decided I wanted to build it from scratch.

Chassis and many of the parts from Dynakits.com, while everything else was from various Ebay sellers, along with a few stops at Mouser.

For now this will just be a picture presentation.  Updates later.

Review: Adcom GFP-555 preamplifier

 (Image from Google)

Note:  This review is of the original incarnation of this model, not the latter Series II model.  The "Series 1", for lack of a better term, features a moving-coil head-amp that can be turned on via a switch on the back.

History: Adcom.  There's a company that brings memories of the late 80s and early 90s, back when their gear seemed to be everywhere.  The famed GFA-555 amplifier drove a lot of high-end speakers, and as proof of their longevity, one of these amplifiers has been in continuous service at my father's house for over twenty years.  My very first "high-end" preamplifier was the Adcom GFP-565 which was once on Stereophile's Class B list.  I never liked the unit, or, to be fair, I never liked the sound I got out of it when matched with a Harman Kardon Citation V.  I've also owned the GTP-400 tuner-preamplifier; not exactly a stellar performer but good for mid-fi duty.

So how did I end up with a GFP-555 in my system?  It was mostly a matter of need since I recently bought a McIntosh 2100 amplifer.  For now I decided to wait until a good McIntosh preamplifier comes along but I required something serviceable until then.  For $129 via Ebay, the Adcom GFP-555 is certainly affordable, and, as I was to find out, is actually quite listenable.

Ins & Outs: A rather boring, er, conservative black metal case.  The tone controls that are defeatable.  A Mono button.  Two outputs - one with capacitors on the output and a "Lab" output that is DC coupled.  Switchable MC (with a 100ohm load) head amp, and a regular ol' MM phono stage.  Dual tape outs - hey, you remember cassette tapes! - and, more important for the McIntosh 2100, switchable two-prong AC jacks.  No video switching or subwoofer outs.

The Sound: Paired with the McIntosh 2100 - a rather strange combination in terms of years - the sound is actually quite good.  Fairly warm without that upper midrange/lower treble grit that I normally associate with solid-state gear.  The bass goes down low with nice control and the treble is fairly clean too, at least not intrusive with the transparent B&W tweeters.  Not bad for a bunch of op-amps.  However, compared to the departed Quicksilver tube preamplifier, the Adcom suffers from less detail, a flatter, more 2-D sound, and, for lack of a better word, some greying of the musical palette.  But such weaknesses are only obvious with active "between the speakers" listening, and does not normally interfere with my current listening habits.

For us vinylphiles, the phono stage is very good - quiet is the first word that comes to mind.  Perhaps I'm too used to tube gear, but with the Adcom the music comes out of the speakers from a black background.  There is no tube hiss or rush anymore.

Conclusion: The Adcom GFP-555 is a sensible - but perhaps a touch boring - option for any entry-level system.  Where it fails - definition, detail, and dimensionality - will only be noticeable as the quality of the front-end and speakers begin to outpace this classic piece.  So this preamplifier does get a recommendation, but only within the confines of the partnering gear.  For example I certainly wouldn't use the GFP-555 to drive a pair of Eico HF-60s into the UREI loudspeakers because only then would I start to hear the deficiencies of this budget piece.  But partnered up with an Adcom amplifier, or any other budget solid-state powerhouse, and some decent speakers, this preamplifier is a good starting point. 

System:

Dual CS5000 turntable with Nagaoka MP-110

Pioneer DVD-V7400

McIntosh MC2100

B&W Matrix 805s on stands

Wire: Various brands

Review: Quicksilver full function preamplifier

Introduction
Quicksilver has been around for quite some time, but their products are often overlooked for the more flashy Conrad-Johnson, Audio Research, or whatnot.  However, much like VTL, Quicksilver instead concentrates on simple but solid tube circuitry, robust old-school construction, and moderate - at least for audiophile gear - prices.  The full function preamplifier in question is the earliest incarnation of the product having first hit the street in 1988.  Price back then was a princely $1995, making it roughly in the same price range as the famed Audio Research SP-8 or the slightly later Conrad-Johnson PV11.

I bought mine from a seller on Audiogon.  Shipping was prompt and I received a very heavy duty preamplifier that doesn't quite have the same ooze of quality that ARC or McIntosh has, but certainly is no slouch in fit 'n' finish.  Cracking open the top plate grills, you will see that the power supply and signal path are separated by a thick steel wall.  Very nice.  Component quality is also good though hardly esoteric.

Circuit and Controls
A quick look over the tube complement and circuitry:  Some of this is based on guesswork since no schematic could be found.  The power supply uses a large power transformer, a pair of 6X4s which are still widely available NOS, a small choke and a number of large Mallory capacitors to provide the DC smoothing, along with some regulation for what I assume are the tube filaments.  The line stage uses one 12AX7, one 12AU7, and one 12FQ7.  Since the reported output impedance is so low, I'm assuming the 12FQ7 is being used as a cathode-follower with some negative feedback wrapped around the entire circuit.  The last bit is the phono stage which only uses a single 12AX7 and a 12FQ7 with some sort of green LED biasing.  Coupling capacitor quality is in the meh range, but hardly out of place for the era.  The big 2uF capacitors on the output stage are some REL Polyesters (ughh).  The smaller signal caps are branded Quicksilver though also look to be REL made.

Front controls are fairly standard though a little dated: No remote here!  Lighted power, AC rear receptacle switch, and a mute button make up the left hand of the faceplate.  The right side has a tape monitor switches, a reduced (20dB) gain switch, a selector switch, and a stereo/mono/etc switch.  Volume control is dual mono with one stepped Blue Alps per channel.  These actually work better than expected - with the numbered volume steps it's very easy to match levels between channels.

Rear panel is the usual assortment of nice gold-plated RCA jacks and a grounding post for the phono stage.  Power cord is captive.  Fuse Holder holds a 1A unit.  AC receptacles are a nice throwback to the days when the user would power up his amp and sources with one flick of the on button.

The Sound
Okay, enough introductions - how does it sound?  Well, since this is an older unit, the stock tubes are long gone.  For the purposes of this review I used some really nice NOS tubes from my stash, so results will vary to a certain degree depending on what is plugged into the sockets.  In my case I used early 1960s short plate Mullard 12AX7s, a late 1940s black-plate RCA 12AU7, and 1960s-era side-getter RCA 12FQ7s.  Rectifier tubes were Tungsol 6X4s.  Some generic tube damping rings came with the unit, so I kept those in place.

It's been my experience that ultra-regulated, current-sourced, current-sinked, and whatnot circuits are very detailed, but also suffer from sounding slightly unnatural.  Note that tube regulators are usually better than solid-state, while shunt suffers from less sterile sound than series.  My own DIY experiments with a simple linestage showed that pulling regulation out of the circuit actually improved overall musicality and enjoyment.  Sure, some of the last bits of inner-detail are missing, but the music usually sounds more relaxed with a looser power supply.  This type of sound was very evident with the Quicksilver preamplifier which just uses chokes and caps to provide a clean source of DC.

Compared to my old Threshold FET-10/HL linestage and Audio Sector Phono Stage, the Quicksilver (with Cinemag step-up transformers) has a relaxed presentation that draws you into the deep soundstage.  It's almost like unclenching your teeth after a roller-coaster ride, or taking a good solid gulp of your favorite adult beverage: the muscles relax and you sit back with enjoyment, washed away by the sonic swirl of the music.  A good stereo should be a psychedelic experience - an unregulated and legal high - that lets you forget the troubles of the world.  With the Quicksilver preamplifier, I feel as if my entire audio experience has been improved.


Listening Notes:
I used my turntable exclusively for this review, but the linstage by itself is no slouch either.  The Audio Sector phono stage combined with the Quicksilver was a pleasant surprise, but the Cinemag and native phono section got the nod in sound quality.

The Who - Tommy (W. German Polydor):  The Quicksilver has very excellent detail and speed, keeping up with Keith Moon's manic drumming without breaking a sweat.  Small individual instruments - like a small bell - maintained their place in the soundstage while still being audible in the wash of thundering bass and guitars.  Depth was deeeeep, making my room seem bigger than reality.

The Beatles - Rubber Soul (Japanese Parlophone): This particular cut of this famed album has been described as bright and bass heavy compared to the original British pressings, but to my ears it sounds like it was eq'd flat.  With the Quicksilver, treble is extended and detailed with out any forwardness or grit.  There is lots of nice detail with John's wonderful voice cutting through the primitive stereo mix.  It's harder to get closer to the Beatles than this.

Tom Waits - Closing Time (80s Asylum): Perhaps I'm a sentimental slob, but I love this album.  However, the Quicksilver revealed the limitations of this later pressing.  Some detail, compared to some better versions, was missing, as if the music was hiding behind a thin gauze.  Tom Waits voice, however, was still wonderful, leading to some near tears while listening to the bittersweet song Martha.

Record after record revealed a preamplifier - and stereo system - that was very analog sounding.  Perhaps somewhat lacking in some of the hyperdetailed / transparency of more modern pieces, the Quicksilver was still no slouch.  When it came to musical enjoyment, I give it an extremely high ranking since it never sounds bleached out or unnatural, even with less-than-perfect recorded music.  If you want a preamplifier that speaks to the mind instead of the heart, you may want to look elsewhere.  I've gone down that road with my foray into solid-state gear, but I'll take naturalness over artificial effects any day of the week.


Overall:
Soundstaging:  Deep and Wide, imaging goes beyond the boundaries of the speakers and even the walls of my listening room.

Treble: Airy and extended, but also pure and detailed.  Compared to the darker Threshold/Audio Sector, it seems there is even more overall treble, but yet it never is harsh or unfaithful to the record.  A strange effect and not at all what I expected from tubes and a step-up transformer.

Midrange: Glorious, but not overly slow or "tubey" in the classic sense.  The Quicksilver certainly doesn't sound like a soggy Dynaco PAS.

Bass: The 12FQ7 output tubes can swing some current while delivering a low output impedance.  This translated into control.  I certainly didn't miss the solid-state drive of my last preamplifier combination.

Speed: (or PRAT) Good tube gear isn't supposed to be sloggy 'n' slow.  The Quicksilver preamplifier and Yaqin amplifier combination certainly doesn't sound like an aged tube integrated or a Dynaco 70 in need of a rebuild.  Instead, the music transients started and stopped on a dime with no overhang.  With the UREI loudspeakers, this led to a very dynamic, exciting, but yet unfatiguing sound.

Detail: As mentioned above, the Quicksilver is no king at wringing out the very last drop of detail from the music.  No, it isn't flat or uninvolving, but the very last bits of information are perhaps less apparent than some other units I've heard.  Some of this may be due to the large Polyster output capacitors.  An upgrade is due for some of the parts - notably some new polypropolene capacitors - so it will be interesting to see what effect this has on the sound.  But really, I'm not complaining because I'll take all of the positive attributes over hearing the squeaky chair of the violinist in the third row.of the orchestra pit.


Conclusion
For a going used price of $850-$1000, the Quicksilver full function preamplifier is highly recommended.  It's extremely well-made and is very natural sounding.  Errors - and I mean minor - are ones of omission with a high scale of musicality.  The simple circuitry will minimize future troubles since there are less "moving parts" once you get rid of the solid-state and regulation support circuitry often found in modern tube preamplifiers.  I expect to increase the audio grade of this unit with some coupling and electrolytic capacitor replacement, so stay tuned!


Main System:
VPI HW19 Mark III with SDS Power Supply
aluminum rebodied Denon DL-103R
Rega RB300 with Cardas wiring
Cinemag CMQEE-3440A in custom aluminum box
Cardas Cross 1M interconnects
Quicksilver preamplifier with (real) Mullard 12AX7s, RCA 12FQ7s, and a RCA 12AU7
Cardas Quadlink 5C 1M interconnects
Yaqin MC-10T amplifier with black-plate RCA 12AT7s and (real) Mullard XF2 EL34s
Cardas Hexlink 2M speaker cables
UREI 813A speakers
VTI BL503 equipment rack