RKV HAA Edition

RKV HAA Edition


(5 customer reviews)


new look with proven technology



… “The Audio Valve RKV HAA is just a great amplifier no matter the topology. What I mean is that the Audio Valve does not have the drawbacks of a valve amplifier but all the benefits. So, we have an amplifier with space, body, sparkle and balanced sound that will give you goosebumps with power to spare for the hardest to drive headphones. The Audio Valve RKV HAA gave me the biggest smile ever, listening album after album and has been so far the greatest surprise in my audiophile journey. This is a keeper and will stay with me for the long ride”.

Read the complete review from a User by Head – Fi


RKV 2 now becomes “RKV – HAA”


RKV 2 now becomes – “RKV HAA Edition” …

A very interesting upgrade. What is it all about you will ask ? The answer is very simple. Our dutch dealer Headphone Auditions Amsterdam is distributing this headphone amplifier based on our current Luminare – but without STAX part. The RKV HAA has been technically adapted and gets a new front to indicate this upgrade. Basis for the development is the established chassis of the current Luminare version with 4 x ECL 85 and nearly 2 x 8 Watt max.

You can order then at HAA – Stefan Gürtler in Amsterdam, or at our store here. So if you are thinking of an amplifier for dynamic or magnetostatic headphones only, the new RKV – HAA is the right choice. Thanks for the great cooperation in the development Stefan …


And who needs that ?
RKV – HAA, an upgrade, especially for headphones with very low impedances from 25 ohms to 200 ohms in OTL – technology.


What are the differences between the RKV-HAA and the Luminare ?

– The RKV – HAA has ….

– no STAX part.
– an additional BALANCE control
– a GAIN attenuator ( -10dB ) to handle low headphone impedances in the comfort zone of the volume potentiometer.

All other features are identical in both products.




Headphone Auditions Amsterdam
Rapenburg 56 H
1011 TZ Amsterdam

m +31(0)683909266



K.v.K. Amsterdam 70928940
VAT-ID NL002434877B32


actual RKV – HAA – spezifications:

  • OTL – transformer outless tube amplifier ( signal ac / dc closed feedback loop in OTL concept )
  • double mono construction
  • Alps volume motor control with remote
  • output: 2 pcs. 6,3 mm stereo / XLR combi jack and 4 pin Sennheiser jack for headphones
  • selectable PRE – GAIN  for low / high impedances
  • BALANCE potentiometer
  • one pair RCA PRE – OUT`s  for power amplifiers
  • input: 2 pairs of RCA and 1 pair XLR inputs
  • tubes: actual 4 x 6F5P (ECL85)
  • power output: each channel 8 watt on 200 ohms load per channel
  • bandwide: 15 – 100 000 hz
  • internal resistance: 0,3 ohms
  • 2 x 8 watt / 200 ohms load
  • distortion 0,002 % at 1 Watt-200 Ohm load
  • max. output voltage 100V
  • sens. 0dBm
  • IC – OPA134 – AC/DC controlled – full autom. – controlled bias
  • class – a / minimum load 35 ohms – maximum load 2000 ohms
  • power consumption min. 90 watt
  • size 370*270*140 mm (d.w.h.)
  • weight 6kg
  • Best ever remote control (A Volume down B volume up) *my contribution to the specification

update: 25. jan. 2021


RKV2 – a unique story that started here – at STEREOPLAY 1982:

For the hearing test, the Dynamp was plugged into the “Line” output of the Onkyo P-3090 reference preamplifier. Beyer’s dynamic DT 880 Studio (test stereoplay 5/1982), which the testers operated on the Onkyo and Dynamp, served as headphones. Only a few listening cycles with different music programs were necessary to determine that there were serious differences: the audio valve reproduced everything that was in the grooves through headphones, cleanly and naturally, and with impeccable and full power it brought dynamic passages or worn areas. Solo voices like complex orchestras came out brilliantly on the headphones without any discolouration Gerald 0. Dick, Stereoplay 9/1982


:::   ultra high end dynamic headphone OTL tube amplifier   :::

you’ll have to look far before you find one better ….

  :: Audio Valve is celebrating the 26h anniversary of the RKV since 1982 ::


Tube amplifier for dynamic headphones – preamplifier and power amplifier at the same time. Up to now the RKV (tube amplifier for dynamic headphones), developped and admitted to our distribution in 1982, is by far the most successful tube amplifier in our product range. Traditional Tube technology has been abandoned and replaced by completely unorthodox approaches to create a concept which is still unique in the amplifier fabrication. Also it has not been resigned latest semi-conductor technology and so a product occurred which reflects 40 years of electronics. The German patent office has secured this idea 1984 with the number DE 3200 51.

“Why headphone amplifiers” – so the Reader might ask. “Doesn’t my output at the receiver suffice?” The answer is simply No. Good, dynamic headphones have a high impedance. For high dynamic jumps, e.g. from CD-Players, they require much higher voltage levels than the supply voltage of transistor amplifiers, which would otherwise be a possibility. The same applies to Hi-Fi systems. So it was one requirement for the amplifier to bring high levels. Moreover it was important to achieve short-circuit strenght and excellent technical data, under the special note of tube sound. The existing concept possesses all this qualities.

By reason of the conformation to high terminating impedances the OTL principle has been appropriated. This concept is geared now to the classic example of the so-called transformerless power amplifier. With the help of semi-conductor technology it has proved to be a felicitous symbiosis of the last 40 years electro-physics. Also all negative existing aspects of the tubes, like weathering and tolerance hum, had to be eliminated. The RKV-electronic manages this problems effortless. An Op-Amp in the signal path creates a servo circle that compensates all above mentioned negative characteristics of the tubes.



It is even able to stabilize the operating point automatically, regardless the weathering of the tube, so that even older tubes continue working without problems. This automatic control circuit has no influence on the quality of the sound, even at the abrasion of the parts. When judging the sound especially the high dynamic of the amplifier and the typical tube sound are to mention.The bass is tight and enormous, the middles are aery and from a liveley transparency and the high range shows an excellent release combined with transparent space. Other products on the market, which want to force their headphones to diabolic peaks by the use of smaller battery voltages or 40mWatt output power, just fail here. Cost-intensive headphones, for example by GRADO or AKG, require effort and just there the RKV is the only reasonable driver source.

Of course the amplifer comes with all this qualities as well in his function as a pre-amplifer for power amplifiers. In this case the output voltage of the RKV is decreased to his 15th part and laid on another pair of Cinch Sockets on the backside of the amplifier. But there is even a third way of using the RKV. The performance of nearly 2*3 Watt is also adequate for driving loudspeakers. Therefore we use the so-called “Impedancer”, that reduces the output impedance of the RKV to the size of the loudspeakers impdedance. Basically high-class transmitters which scale down the output voltage. With loudspeakers starting from 93 dB you can receive an excellent musical result. The RKV as an universal genius in this three category groups of Hi-Fi technology has no competitor that is nearly able to hold a candle to him in this prize class. For all the people who only consider two of this mentioned possibilities for their own use the RKV is already the only right decision.



The following photo shows you a screenshot from the oscilloscope from a channel on RKV 2 – Model 2016 6F5P with attached Verto and 8 ohm load at the output. You see, this clearly represents the new model series more power at the output at your disposal, as the past has been the case. The re-sizing of some components and small circuit corrections deliver today on RKV 2 in OTL mode at the beginning of Soft Clipping per channel 8 watts.The following photo shows you a screenshot from the oscilloscope from a channel on RKV 2 – Model 2016 6F5P with attached Verto at the output of the STAX socket. Due to the increased power of the RKV 2 the yield of STAX signal now arises voltage is at Verto following measures.




1) Special patented circuitry, OTL amplifier, stable and long lifetime vacuum tube. 2) Opulent sound carrying the luster of nobility with broad sound field. 3) Base frequency with detailed characteristics and controllability, a demonstration of high performance. 4) Strong drive to present a realistic earphone power.SUGGESTIONS
1) For earphones with impedance lower than 100 Ohms, use the matching impedance provided by the original manufacturer. 2) For best sound effects, use high quality earphones. 3) This earphone amplifier brings out the most beautiful and comfortable sound without distortion. So please properly adjust the volume control to avoid too loud a volume that may damage your listening pleasure.On the RKV back panel, there are two sets of RCA terminals. Why two sets? This is because these two terminal sets are connected in parallel. When one terminal is used as the input, the other terminal can then be used for recording output or connected to the front amplifier. The panel has two earphone inlets. The manufacturer recommends that simultaneous use of two low impedance earphones is to be avoided.I have always had some doubts about the earphone amplifier: 20 years ago, there was no such thing as an earphone amplifier. Nor in a recording room I saw the sound man use such a device. Is it really necessary to buy an earphone amplifier and discard the traditional earphone equipment? AudioValve does think the earphone amplifier necessary or it would never be put into production. The modern audio signal source such as CD has wide dynamic range which is in fact the voltage range that drives the earphone. Earphone output from an ordinary amplifier cannot handle the wide range of voltage variation and hence fail to respond or give good performance.


Targeting at the earphone amplifier, the AudioValve originator Helmut Becker set out his research. What would be the optimum voltage amplifier element? It is without doubt that the vacuum tube is the ultimate candidate. What is the limitation of a vacuum tube? We need to output sufficient current for a low resistance earphone. The first generation RKV was born in 1984. Then, the special PCL 805 pentode for TV use was employed. Next, the RKV Mark II adopted the OTL full vacuum tube differential amplifier circuit without output transformer. For this special purpose, AudioValve filed the patent rights of the circuitry (No. DE 3200 517). Helmut Becker considers this as a breakthrough of the 40 year progress in audio technology. Using the Op Amp for power supply coupled with complete vacuum tube amplifier for the signal path provides optimal combination of the vacuum tube and transistor technology. The circuitry uses the DC servo Op Amp network for power supply which automatically adapts to the routing conditions. The manufacturer claims that this circuitry will function normally throughout the lifetime of the vacuum tubes.


We used to give advices on the earphone. Nonetheless, an earphone can never produce a heart-rending base energy like a large speaker. Testing an RKV Mark II on Sennheiser HD-580 (300 Ohm resistance) which I have used for years, I can feel the base frequency copiously reborn with every characteristic detail and controllability. The feeling becomes very close to the effect of a large speaker. Comparing to my Graham Slee Voyager, a portable earphone amplifier, I can instantly discern the superiority of RKV Mark II as I can feel a better listening. Where does this better listening come from? More characteristic details? I quickly switch between the two earphone amplifiers. I find not much difference in the characteristic details. But after long listening, I start to pick up the merit of RKV Mark II as its sound is broader, fuller, and more stable. There is the characteristic of thickness and relaxation that makes you feel very comfortable without any pressure. Also, the sound from the RKV Mark II possesses some warmth and luster of gold, yet without any antique tube noise. It is the warmth as well as the luster that brings out the quality of the string instrument. It provides more elasticity to the guitar sound.


If using Beyerdynamic DT 990 Pro (250 Ohms), the difference becomes more pronounced. For Graham Slee Voyager, the volume must be turned to the 9 o’clock position to have more amplification gain and yet the sound drive is still not full enough. If changed to RKV Mark II, the sound becomes fully open and the dynamic state and stability are of first class. This brings out the real value of the flagship earphone device. As to the two low resistance earphones of AKG K240 Studio (55 Ohms) and Grado SR60 (32 Ohms), the performance can perfectly meet the standard requirement. But in reference to the earphone amplifier, the difference is not so obvious. To match the AudioValve with low resistance earphone (under 100 Ohms), we recommend the use of impedance matching device with a panel switchable between 8~64 Ohms in four divisions. The panel also should be provided with a speaker output terminal so that it can drive high sensitivity speakers.
Indeed the RKV Mark II is quite expensive. However, according to my experience, a good earphone device can last for a long time and will never be outdated. Therefore, it is definitely a worthwhile and necessary investment. The RKV Mark II is absolutely the top choice of all the earphone devices. I believe that an audio fan should value their ear highly. Using the RKV Mark II is a royal class enjoyment.


Technical explanations for RKV2 and LUMINARE  that show why this concept provides such good results

The picture below shows you the max. Output voltage before start soft clipping in OTL mode at 220 Ohm load per channel  at 43 Vrms are on each channel 8,3 watts


The following photo shows you a screenshot from the oscilloscope from a channel on RKV 2  Model 2016 6F5P with attached Verto and 8 ohm load at the output. You see, this clearly represents the new model series more power at the output at your disposal, as the past has been the case. The re-sizing of some components and small circuit corrections deliver today on RKV 2 in OTL mode at the beginning of Soft Clipping per channel 8 watts.


The following photo shows you a screenshot from the oscilloscope from a channel on RKV 2  Model 2016 6F5P with attached Verto at the output of the STAX socket. Due to the increased power of the RKV 2 the yield of STAX signal now arises voltage is at Verto following measures. Its round about 1500 AVCpp

nearly 600 VAC for STAX headphones ( 1500 VAC pp ) – same what deliver LUMIARE or SOLARIS …


RKV – HAA – spezifications …

  • OTL – transformer outless tube amplifier ( signal ac / dc closed feedback loop in OTL concept )

  • double mono construction

  • Alps volume motor control with remote

  • output: 2 pcs. 6,3 mm stereo / XLR combi jack and 4 pin Sennheiser jack for headphones

  • selectable PRE – GAIN  for low / high impedances

  • BALANCE potentiometer

  • one pair RCA PRE – OUT`s  for power amplifiers

  • input: 2 pairs of RCA and 1 pair XLR inputs

  • tubes: actual 4 x 6F5P (ECL85)

  • power output: each channel 8 watt on 200 ohms load per channel

  • bandwide: 15 – 100 000 hz

  • internal resistance: 0,3 ohms

  • 2 x 8 watt / 200 ohms load

  • distortion 0,002 % at 1 Watt-200 Ohm load

  • max. output voltage 100V

  • sens. 0dBm

  • IC – OPA134 – AC/DC controlled – full autom. – controlled bias

  • class – a / minimum load 35 ohms – maximum load 2000 ohms

  • power consumption min. 90 watt

  • size 370*270*140 mm (d.w.h.)

  • weight 6kg

  • Best ever remote control (A Volume down B volume up) *my contribution to the specification

actuallised: 28.jan. 2021


Hifi magazines

Ken Kessler

Best Sound TAIWAN – test review

AudioValve Taiwan – test review

Carlos – test review

Dan – test review

Jean Paul Hiraga test review

Haute de fidelite

RKV2 – review  china



RKV – HAA english USER Manual

5 reviews for RKV HAA Edition

Based on 3 reviews
5 star
4 star
3 star
2 star
1 star
  1. Helmut Becker

    Helmut Becker (store manager)

    Guten Tag Herr Becker,
    In der vergangene Woche und jetzt am Wochenende hab ich mal ausführlich Musik gehört. Ich muss sagen der RKV HAA klingt wirklich genial. Das detailliert zu beschreiben ist für mich nicht so einfach, da ich eher ein Gefühlsmensch bin, und das ist mit Gefühlen ja so ne Sache. Da ich aber auch sehr gerne lese, versuch ich’s mal mit eine Analogie.
    Ein Buch kann man ganz gut auf ein Hocker sitzend unter eine nackte Birne lesen.
    Aber das geht viel besser in ein gemütlicher Sessel unter eine Kronleuchte.
    Der RKV HAA ist da die Kronleuchte.
    Ich bin sehr glücklich damit.
    MfG G.C.
    P. S. Der Gain Schalter ist auf niedrig, also mit rote Lampe an.

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  2. Helmut Becker

    Helmut Becker (store manager)

    Grüß Sie Herr Becker,

    in diesen Tagen ist es passiert. Mein RKV hatte wieder einmal Geburtstag. In diesem Jahr ist
    er nunmehr 36 Jahre in zuverlässigem Betrieb. Für mich der “Audiophile Käfer” schlechthin.
    Er läuft und läuft und läuft… Und klingt und klingt und klingt….
    Dank seiner patentierten Auto-Bias Schaltung
    musste er keinerlei klangliche Einbußen hinnehmen.
    Und das als Röhrengerät…!!

    Dies ist wohl das einzige High-End-Gerät aus den frühen 80 er Jahren,
    von dem solches begründet und nachvollziehbar ernsthaft behauptet werden kann.

    Ich denke, ich habe eines der ersten als Bausatz erhältlichen Geräte aufgebaut.

    Doch nun ist die Zeit ins Land gegangen
    und die Kopfhörer haben eine erheblich geringere Impedanz als zu jener Zeit.

    Und die Frage ist: was kann ich tun, damit ich einen 32 Ohm Kopfhörer mit dem RKV betreiben kann?

    Beim “Luminare” gibt es diesen Mode Umschalter an der Front.
    Kann ich die Lösung dahinter auf meinen RKV anwenden?
    Was müsste ich dazu tun?

    Mit freundlichen Grüßen
    E. – A. Pohl

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  3. Helmut Becker

    Helmut Becker (store manager)

    Hi Helmut! Thank you SO much for responding so quickly and helpfully! Yes, it’s absolutely true: over the last 25 years of my involvement with high-end audio, the RKV stands at the top as my most-beloved and most-missed piece of gear. I am absolutely ecstatic to know that it’s available! I am going to start saving my money right now, with the goal of purchasing one this Spring. I look forward to doing business with you (again); and wish you and yours a fantastic 2020, filled with joy, love, and laughter in abundance! 🙂 Warm Greetings from the U.S. , Steve

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  4. Helmut Becker

    admin (store manager)


    Röhrenverstärker für dynamische Kopfhörer und Hochpegelanwendungen

    Der bisher in unserer Produktpalette mit Abstand erfolgreichste Röhrenverstärker, ist der 1984 entwickelte und in den Vertrieb aufgenommene RKV, was soviel heißt wie, RÖHRENVERSTÄRKER für DYNAMISCHE KOPFHÖRER . Traditionelle Röhrentechnik wurde hier über Bord geworfen und mit völlig unortodoxen Lösungswegen ein Konzept geschaffen, was bislang im Verstärkerbau einmalig geblieben ist. Aber auch auf modernste Halbleitertechnik wurde nicht verzichtet und so entstand ein Produkt, in welchem sich 40 Jahre Elektronik widerspiegeln. Das dt. Patentamt hat diese Idee 1984 unter der Nummer DE 3200 51 geschützt. Warum so könnte der Leser fragen – Kopfhörer verstärker ? Genügt da nicht mein Ausgang am Reseiver? Die Antwort lautet ganz einfach Nein. Gute dyn. Hörer benötigen für hohe Dynamiksprünge – wie sie z.B. von CD Playern kommen – aufgrung ihrer hohen Impedanz Spannungspegel, die weitaus höher sind als die Versorgungsspannung von Transistorgeräten. Dies gilt auch für HI-FI Anlagen. Hohe Pegel zu bringen war also eine Bedingung die der Verstärker erfüllen sollte. Darüber hinaus galt es Kurzschlußfestigkeit und ausgezeichnete techn. Daten zu erzielen unter der besonderen Note des Röhrenklanges. Alle diese Eigenschaften besitzt das vorliegende Konzept.

    Trotz Röhrenverstärker wollte man natürlich auf einen Übertrager verzichten. Wegen der Anpassung an hohe Abschlußimpedanzen bot sich das Konzept des OTL Prinzip`s an. Am klassischen Beispiel der sog. -eisenlosen Endstufe – orientiert sich nun dieses Konzept und wurde unter zuhilfenahme von Halbleitertechnik zu einer gelungenen Symbiose der Elektrophysik der letzten 40 Jahre. Auch alle negativen, die Röhre umgebenden Eigenschaften wie da waren Alterung- Toleranzen Brummen, um einige aufgezählt zu haben, galt es zu eliminieren. Die im RKV befindliche Elektronik kann dies mit Bravour. Mit Hilfe eines qualitativ hochwertigen Op-Amp im Signalweg konnte ein Servokreis geschaffen werden, der alle o.a. neg. Eigenschaften ausregelt. Das geht sogar soweit, das der Arbeitspunkt unabhangig von Röhrenalterung autom. stabilisiert wird, sodas auch altgediente Röhren gut den Dienst weiter versehen. Zusammenfassend kann gesagt werden, daß durch diesen autom. Regelkreis selbst bei Verschleiß der Teile, keine Qualitatseinbuße in der Musikalität in Kauf genommen werden muß. In der Beurteilung des Klanges ist besonders die hohe Dynamik des Verstärkers hervorzuheben und der eben für Röhrenverstärker charakteristische Klang. Die Basse kommen straff und gewaltig, die Mitten sind luftig und von einer sehr lebendigen Durchsichtigkeit, und im Hochtonbereich zeichnet eine sehr gute Auflösung verbunden mit transparenter Räumlichkeit. Diese Eigenschaften besitzt der Verstärker natürlich auch bei seiner Verwendung als Linearverstärker in anderem Einsatz. Im übrigen treibt der Verstarker Impedanzen zwischen 30 – 2000 Ohm, womit der Anschluß auch mehrerer Hörer, solange die Gesamtimpedanz nicht zu niedrig wird. möglich ist. (Lemgo 1982)

    Und hier der Test aus der STEROPLAY 1984

    Eine kleine deutsche Firma möchte mit einem Röhrenverstärker Kopfhörer zu Höchstleistungen anspornen.

    KIein, aber fein

    Test Kopfhörerverstärker

    Helmut Becker, 30, hatte eine großartige Idee. Er wollte etwas konstruieren, was nirgendwo zu kaufen war. Und dafür gab es einen guten Grund.

    stereoplay untersuchte im Test, ob der Dynamp der kleinen Firma Audio Valve in Lemgo das vom Konstrukteur versprochene Ziel erreicht. Immer dann nämlich, wenn er Lust hatte, seine HiFi-Anlage aufzudrehen, vermiesten ihm lauthals protestierende Nachbarn sein Klangerlebnis. Wenn er sich aber verärgert den Kopfhörer überstülpte, konnte er ebensowenig frohen Herzens genießen. Denn die Wiedergabe mit seinem 800-Mark-Verstärker konnte ihn nicht zufriedenstellen. Was lag also für den gelernten Elektronik-Techniker, der in der Medizingeräte-Technik tätig war, näher, als einen Kopfhörer-Verstärker zu bauen, der höchsten Qualitätsansprüchen gewachsen war?

    In der Tat ist die Idee nicht schlecht, denn mancher HiFi-Freund, der Aktivboxen besitzt, muß auf Kopfhörer-Wiedergabe verzichten, wenn sein Vorverstärker keinen entsprechenden Anschluß besitzt. Es gibt aber auch Musikliebhaber, die aus Platz- oder Kostengründen nur Mittel-Klasse-Lautsprecher besitzen und über Kopfhörer Musik hoher Güte hören wollen – die weitaus billigste Art, HiFi zu erleben. Becker ist Anhänger der guten alten Röhrentechnik. Er studierte sehr genau gewisse Vorteile dieses einstmals glorreichen Bauelements gegenüber den modernen Halbleitern, die heute in allen HiFi-Komponenten zu finden sind. Für sein spezielles Vorhaben boten sich zwei Eigenschaften besonders an: Elektronenröhren können an hochohmige Lasten vorteilhaft angepaßt werden, wie sie dynamische Kopfhörer mit ihren typischen 600 Ohm darstellen. Und für elektrostatische Hörer, die nach extrem hohen Spannungen von einigen tausend Volt verlangen, bieten die Röhren geradezu ideale Voraussetzungen für harmonsches Zusammenspiel.

    So ganz wollte der Erfinder aber auch nicht auf die heutige Halbleitertechnologie verzichten. Dort nämlich, wo

    die Röhren eher Nachteile besitzen – etwa in der Eingangsstufe oder bei Kontrollaufgaben für die Endstufenröhren -, setzte er folgerichtig Transistoren und integrierte Schaltkreise ein. Der Dynamp besteht also aus einem sinnvollen Gemisch von Halbleitern und Röhren (Hybid-Verstärker), wodurch sich Becker ein gewisses Optimum verspricht.

    Äußerlich demonstriert der Verstärker kaum sein komplexes Innenleben. Das simple, schwarze Lochbiech, das als Ab- deckung dient, erinnert eher an Billig-produkte als an ein Qualitätsgerät. Die goldeloxierte Frontplatte zeigt ebenfalls, daß Audio-Valve noch eine sehr junge Firma ist, die vom Marketing nicht allzuviel hält. Becker verzichtete bewußt auf teures Finish und steckte das Geld lieber in die Elektronik.

    Zum Hörtest steckte der Dynamp am ,,Line”-Ausgang des Referenz-Vorverstärkers Onkyo P-3090. Als Kopfhörer diente der dynamische DT 880 Studio von Beyer (Test stereoplay 5/1982), den die Tester abwechselnd am Onkyo und am Dynamp betrieben. Es waren nur wenige Hördurchgänge mit unterschiedlichem Musikprogramm notwendig, um festzustellen, daß es gravierenden Unterschiede gab. Der Audio Valve reproduzierte über Kopfhörer alles, was in den Rillen steckte, sauber und natürlich. Untadelig und volle Kraft brachte er dynamische Passagen oder auch getragene Stellen. Solostimmen wie komplexe Orchester kamen über die Kopfhörer in brillanter Darbietung ohne jede Verfärbung.

    Gerald 0. Dick

    Stereoplay 9/1982

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  5. Helmut Becker

    admin (store manager)

    Confrontation of the SRM 727 007t2 and RKV-WEE on 009 and 007
    Good evening, I finally passed in the listening in the afternoon of 3 systems of development of foots the bill
    Stax SR 007 mk3 and
    SR 009
    at my disposal: amplis Stax SRM 727-II (mine); SRM 007t2 (that of Pierre)
    and combi RKV MK2 + WooAudio WEE; every ampli connected on good phase sector (what obliged me to
    invert the sense(direction) of the cordon sector between the WEE-RKV and the amplis Stax (having no same
    visible sense of it phase)
    . Results on the listening of a test CD (Stéphane Grappelli and
    Michel Petrucciani
    in the album Flamingo)
    Reserved CD because very well registered(recorded), but however quickly hard in the treble with a bad
    system; quickly lung and dislocated in the grave (followed by the double bass) with a bad system; brief,
    quickly unpleasant to listen to with a bad system 😉
    And the winner is.
    … The
    MP3 of my wife:mdr:
    It is not true, because it is so small that I did not find him where he hides and thus I was not able to
    test him …
    And the winner(conqueror) is …
    To go to you quickly the knowledge 🙂
    I proceeded with method 😉
    At first listening of the range 4 of this test CD Flamingo with my 727 + 007 mk3: results : intimist sound
    stage (that is not extra wide); soft and inarticulate basses (not obvious to follow), but there is of the curvature
    ( a soft curvature); the violin and the
    are not unpleasant to hear, stamps are rather fine, but with a
    rather curious presentation of ” clearly – dark “.
    I am understandable: the top-medium is rather dark (set back), the low medium is rather carnal, but there is
    also a bright aura and a sparkling of the very clear acute extreme, being able on this recording, by its
    insistence(emphasis) for the acute percussions and harmonious acute of the violin, the tiring future.
    By listening to the same range 4 of this test CD Flamingo with my 007 mk3, but this time connected on him
    007t2 of Pierre, I found the a little better listening in the sense than 007t2 limit, in my ear, the sparkling of
    the acute extreme which I find with 007 mk3 + 727. Stamps are also more refined; the a little wider, more
    clean sound image. The basses of 007 mk3 + 007t2 are a little bit set back with regard to that of 007 mk3 +
    727, not very dynamic, but maybe be a little more articulated
    than those of 727 with 007 mk3. The listening
    of 007 mk3 with him 007t2 is globally more pleasant, less tiring in the acute extreme than with 727, a little
    more refined, but without being an outstanding leader in dynamism.
    Thus I have in the end a small preference of 007t2 + 007mk3 with regard to727 + 007mk3.
    Now let us cross tuned tothe range 4 of this test CD Flamingo with my 727 + 009. Then there, it is one any
    other listening: as said it my friend Jean-Marc, as 007 seems round, as 009 appears by clear and defined
    contrast; it is almost the day and at night :wink:. First of all, the sound stage of 009 is wider and
    detailed(retailed) that that of 007 (most open sound). The dynamics is much better, with low sandbanks,
    articulated, very readable, less intense than those of 007, but far clearer; the grave extreme is very present.
    The sound is more clear with stamps of the violin and the more realistic, hard-hitting
    for the piano, but
    regrettably a little bit hard for these instruments at high level of listening. The acute extreme is less present,
    less twinkling than with 007, what in the end is more restful and more natural more also. The sound is rather
    alive, dynamic, but a little bit hard, ” a little bit raw “.
    When is it now the listening of 009 with 007 t2 of Pierre? (Always with the same test CD)
    And well I am going to surprise you, it is not for me the best listening, and I prefer that of 727 with 009 (by listening to
    not too hardly). 007t2 differs from 727 by a little less presence in the grave, even if very clean(appropriate) with 009,
    but it is a little bit it’s a pity to listen to one 009 the presence of which in the grave is sometimes little ” just ” (especially
    by comparison with 007); also, he limits slightly the acute extreme (always with regard to 727), what is rather good for
    007 mk3, but a little bit it’s a pity with 009 which has him no problem in the acute extreme.
    Certainly stamps are
    more refined than those of 727 who in comparison make more “raw”, but is missing something in 007t2
    (with regard to 727), a stalk of life. Indeed, I find the listening of 007t2 very civilized, very sophisticated, but
    being strangely lacking life, as disinfected. It is “squeaky clean”, but “slightly too squeaky clean” for my
    taste. It is very clear for the listening of this CD Flamingo: with 727 + 009 we want to stamp with the rhythm
    of the musicians and to increase the volume of the sound, until be called in to order, because the sound of
    727 eventually becomes hard and the tone of the piano and the unpleasant violin at high level of listening;
    but the rhythm is there, the life is there
    With him 007t2 we can increase more easily the sound, but that if disinfected rest (too squeaky clean, “not
    rather” “raw”(“gross”)).
    Well, I finished it with my comparative degree …
    Except that I forgot to speak to you about the listening of 007mk3 and about 009 with the combi
    RKV + WEE (with the good phase sector (inverted with regard to that of the amplis Stax) for the
    And well, it is necessary to speak to you about it 😉
    First of all, listen to of the range 4 of this test CD Flamingo with my RKV-WEE + 007 mk3: results :
    improved sound scene(stage) and …
    And the
    007 mk3 becomes unrecognizable, transfigured in its dynamics by the RKV-WEE: and
    well that moves and 007 wakes up finally: powerful, robust, rhythmical, very readable basses: we stamp; we
    go up the sound, there is of the life, but we are called back by the acute extreme, always too present, which
    becomes getting tired for a too high level of listening. The neutrality is certainly not the key point with grave
    sound everything in acute curvature, this high a little bit set back medium and this extreme sparkling
    (however not unpleasant to listen to on the condition of not pushing too far the
    of volume).
    The best rest to be told you for the end, the listening of 009 with the RKV-WEE: and well, as said it
    , it could be completed, because gathering the best of each of the previous listening: the sound stage:
    she is strangely wide, of course with regard to(compared with) that of 007 mk3, but also with regard
    to(compared with) that 2 amplis Stax (727 and 007t2) with 009. There is of the life, the rhythm, it is without
    appeal with regard to the listening of 009 on him 007t2 who by contrast made disinfected, as too much
    civilized ; there is some strength and the power: the rhythm of the bass and the percussions urges you
    instinctively to go(take) up the sound, and the more one goes up the sound, the more it is good, and we still
    increase the potentiometer of volume of the RKV, without limit or almost.
    ( If it is the small voice which
    says to me, stops there, because it becomes unreasonable; we are not in a concert live, and you are
    quickly going to become deaf if I continue to go(take) up the sound like that. But in the hearing,
    none limits visible; more we increase the sound, better is the scale, the rhythm, the life …
    As for stamps, the RKV-WEE + 009 manages of the exploit to obtain the quality of the stamps of 007t2, but
    with the life in more (with a contrasted, dynamic, alive sound, being able to be rough (percussions at strong
    level of listening), but also of a very big sweetness and a subtlety, on different musical passages), and not a
    little bit flat and disinfected as that of 007t2.
    I thus let on you decide on the winner of this confrontation 😉 🙂
    Unless the
    MP3 of my wife knocks down the situation …

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