:: integrated stereo pure tube amp masterpiece class "A" for low impedances headphones - and speakers too ::

The new Eartube Mark II  headphone amplifier will come out in a new and wonderful looking re-design in optic and technicial thinks.

                                                                               It will be in the same heavy laser cutted chassis as our other amplifiers, with some new features ......      
                

  • A better and special output transformer ( PIKATRON )with the possibility of the connection for a pair of 8 ohms loudspeakers

  • Balance control +/- 3dB

  • Stereo analog volume panel meter

  • One pair of XLR inputs (+ only )

  • 2 pairs of 8 ohm Speaker output terminals ( speaker efficency up tp 94 dB )

 


 

For many interested earphone-enthusiasts, who spend a lot of money on their hobby, only a melodious tube amplifier is possible as a driver. The answer to the question: „ Which do I take? “ can only say: the EARTUBE of AudioValve!

 

The Eartube was developed especially for the highest-quality reproduction with earphonesand serves very well impedances of 16 to 200 ohms. He unfolds his big strength with roughly 4 watts per canal in 100 ohms. For that reason he is very well suitable e.g. for the K1000 by AKG.

 

The Eartube is a pure tube amplifier and owns no semiconductor in the signal way. Merely the stabilization for the tube heatings and anode tensions occurs highly exactly with semiconductors.

 

 

The amplifier owns two switchable entrances with different delicacy. Thus can be connected, e.g., CD player and TUNER at the same time.

 

The input circuit of the amplifier owns three tubes of the Type 6N3P and prepares the signal for the output stage tubes. In this area of the circuit also the volume potentiometer with the shiftable or detachable Crossfeed filter is located, to distribute potential signal bass charge on merely one ear to both ears.

 

 

 

The output stages use the power Tetrode of the type: QQE 03/12 as the military version by SIEMENS and work in circuit PP with a transformer which is tuned especially to the interests of earphones.

 

The final tubes work constantly in Class A and are postregulated automatically optimally in the Bias closed current, so that tolerance and aging of the tubes do not matter.

 

 

 

The care tensions are won from a strong, free of litter, Torodial-Transfomator. The amplifier itself rests on one single two-page printed circuit board and was adapted signal-technically optimally. For this reason also the potentiometer is in the rear part of the printed circuit board to hold the signal way short. All parts on the PCB are of the best quality and selected carefully to do justice to the requirements of the reproduction in every regard. The case is from metal and prevents interferences from the outside. It is available in the colours black and silver.

 

 

 

Like all products of AudioValve this amplifier also distinguishes itself especially by his exceptional musicality which is based at last also on the fantastic technical values of the circuit and their stability. As a user you will be able to enjoy this product in the highest perfection for many years enthusiastically and come with it to the pleasure of fantastically detached musical reproduction with your headphones.

 

 

Pour de nombreux amateurs de casque intéressées qui passent beaucoup d'argent sur leurs passe-temps, juste un amplificateur de tubes harmonieux est en cause comme le pilote. La réponse à la question: «Qu'est-ce-je prendre?" ne peut signifier: l`EARTUBE d`AudioValve.

 

L`EARTUBE a été spécialement conçu pour la lecture de haute qualité à travers les écouteurs et servant d'impédances de 16 à 200 ohms excellent. Il déplia sa grande puissance avec près de 4 watts par canal sous 100 ohms et est donc idéal par exemple pour le  K1000 de AKG.

 

Le EARTUBE est un ampli de tubes pure et n'a pas de semi-conducteurs dans le trajet du signal. Seule la stabilisation de la chauffe du tubes et des tensions d'anode sont des semi-conducteurs de haute précision.

 

L'amplificateur dispose de deux entrées commutables avec des sensibilités différentes. Comme ca, par exemple les lecteurs de CD et les tuners peux être connectés simultanément.

 

 

 

Le circuit d'entrée de l'amplificateur dispose de trois tubes de l'6N3P type et prépare le signal pour des tubes dernier étage. Dans cette zone du circuit est aussi le potentiomètre de volume avec le filtre Crossfeed allumable et déconnectable, pour distribuer un charge eventuel de signal basse sur juste une seule oreille aux deux oreilles.

 

Les amplificateurs de dernier étage utilent la puissance tétrode type: 3,12 QQE dans la version militaire de Siemens et travaillent dans le circuit de PP avec un transformateur qui est adapté aux besoins des écouteurs.

 

Les tubes de sortie sont constamment dans la classe A et sont automatiquement ajustés optimale dans le courant de repos Bias, alors les tolérances et le vieillissement des tubes n'ont pas d'importance.

 

 

Les tensions d'alimentation sont issus d'un transformateur toroïdal fort et libre de la dispersion. L'amplificateur lui-même repose sur une carte imprimée bilatérale  et a été modifié de signalisation optimale. Pour cette raison, aussi le potentiomètre se trouve à l'arrière de la carte imprimée, pour garder le chemin du signal à court. Tous les composants sur la carte imprimée sont soigneusement sélectionnés et de la plus haute qualité pour satisfaire aux demandes de la lecture à tous égards. Le boîtier est en métal et empêche l'entrée des étrangers.

Il est disponible en noir et argent.

 

Comme tous les produits d`AudioValve, aussi cet amplificateur est caracterisé de son musicalité exceptionnel, qui se fonde en définitive sur les valeurs étonnante technique du circuit et son stabilité. Comme utilisateur, vous pourrez profiter de ce produit de perfection pendant de nombreuses années et bénéficier de la fantastique lecture détaché avec votre casques d`écoute.

 

 

 

          technicial specifications - EARTUBE basic tube amplifier model:

  • Bass - crossfeed filter is implemented ( switchable )
  • power output: 2 * 3,5 watt
  • Tube: 3 x 6N3P and 2 x QQE 03/12 (Siemens long life military version).
  • This is an amp for relaxed and comfortable listening.
  • 2 high quality NEUTRIK headphone output jackets on front
  • Gain factor: Input 1: (14,5 dB), Input 2: (21,5 dB)
  • 2 pairs of Gold-plated RCA - input jacks.
  • 1 pair golden XLR volume controlled pre outputs for separate power amps ( 400 ohm imp. )
  • S/N ration 100 dB
  • channel separation 70dB
  • power band wide 8 - 80.000 hz
  • Input impedance 47 kOhm
  • impedances headphones: 8 - up to 200  
  • headphone and speakers usable at the same time
  • Silver or gold plated knobs  .
  • Alps log- - potentiometer for volume control.
  • 100 and 245 VAC main voltage versions available.
  • Earthground / signalground floating connected
  • high precisition plate and heating voltage lines.
  • power consumption 100 VA
  • Weight: 8  kg.
  • Size: wide: 38cm x deeph: 26cm x high: 12cm.
     

distortion
% ( 1khz )

0,1 watt

0,5 watt

1 watt


1,5 watt


2 watt


4 watt

8 ohm

0,06%

0,12%

0,2%

0,5%

0,8%

1,2%

40 ohm

0,06%

0,12%

0,2%

0,45%

1%

0,9%

100 ohm

0,06%

0,13%

0,2%

0,35%

0,5%

1%

200 ohm

0,08%

0,3%

0,6%

1%

 

 

600 ohm

0,12%

0,4%

0,7%

1,2%

 

 


As a second model of its amplifier named EARTUBE MARK II - USB. In its amp, we have installed a very populare DIGITAL audio player for USB sticks or SD cards. Its player can handle memory size up to 8 GB and supported MP3 and WAV files.  An FM  reseiver is integrated too. You can direct select your music titles by panel buttons on front or with the remote control. Its nice to handle and simple to use and satisfight everyone who like to hear memorized digit music from sticks .....   

 

 

Digital  Audio Player  - technicial describtions and possibilities:

*  Play music from any USB / sticks or SD - card up to 8 GB with MP3 or WAV format files  / FM radio integrated

*  Built in RTC clock cirucit with time /alarm function

*  MP3 / WAV decorder support 32–320kbps. 18-bit resolution with no missing codes, Dynamic range: 99 dB, sample rate: 48kHz

*  Play/Pause, Next ,Previous ,Vol- ,Vol+ ,Stop, EQ ,Repeat ,Mute

*  FAT16 or FAT32 systems supported

*  Memory the song number and volume even power cut down

*  With Remote control

*  Power supply optional (DC 3.7V / 5V)

*  Built in Amplifier Optional

*  LCD display


Keys function on Pannel

Power : Long press for stanby ,and lon g press again will wake up .

Set :    Setting for Time Alarm Sleep Language Finish

VOL- : Volume down and minus for setting Time , Alarm ,and Timing swith off.

VOL+:  Volume  down  and Plus  for  setting  Time ,  Alarm  ,and  Timing  swith off.

Play/Pause : Short press for Paly or Pause for USB and SD state (also for

auto-search channels and save them in FM state)


Remote Control Keys function

Power : ON/OFF    (standby )

Mode  :  Switch  order  will  be  USB SD FM USB  (if  have  USB memory and SD card) , Switch order will be USB FM USB (if only have USB memory) Switch order will be SD FM SD (if only have SD card )

PREV :Same functions as Previous Button on pannel

NEXT: Same functions as Next Button on pannel

VOL+ : Same functions as VOL+ Button on pannel

VOL-: Same functions as VOL- Button on pannel

REP:  For switching  one  song  repeat  or  all  song  repeat  in  USB/SD  state,

default is all song repeat .

*SET : Setting for Time Alarm Sleep Language Finish

MUTE: First press mute , press again will release from mute.

EQ : NORMAL, JAZZ, ROCK, POP, CLASSIC, COUNTRY

PLAY/PAUSE  : For play and pause in USB/SD state , for auto-search

channel and save them in FM state.

Button 0-9 : select song in USB/SD state, if the song number over 9 , just input the numbers in series.

 


 

After the summer vacation we will have as a new unit an digital audio player who can handle USB - sticks or SD - memory cards up to 8 GB with music files in MP3 and WAV file format. Also its unit have a FM receiver. Its functions all can be handle from front panel buttons or from the remote control.

The best of all is - its unit has an MM - phono amplifier integrated too. The technologie is very popular  "OLD SCHOOL" transistor technology and very very good to combine with a vinyl turntable player.

On the front panel its goods is a selector to select between PHONO - or - DIGITAL PLAYER mode, so the back panelo its model have only 2 pairs of RCA jackets ...

  • MM input from turn table
  • One line OUTPUT for the pre amplifier.

We deliver its unit with an universal main power adapter for 100 - 250 VAC and a remote control.

 

tech. details:           

1) digital - player, same details like the EARTUBE MK II - USB

-------------------------------------------------------------------------------------------

2) MM - phono moule

output impedance: 450 ohm
input impedance: 47 kOhm
RIAA accuracy: (Referenz - 0,000dB - 1Khz:
100Hz - 0,07dB     
10.000Hz - 0,04dB
20.000Hz - 0,02dB
30.000Hz - 0,02dB
noise: -74dB
distortion: 0,015% ( 1V rms output signal )
gain: 46dB

 
 

 

 

 

 


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