AudioValve EARTUBE - MARK II User Manual

EARTUBE – Mark II HEADPHONE AMPLIFIER__

Congratulations

- MARK II ( or EARTUBE MARK II - USB )

This

owner manual has been prepared to help you to understand the operation of

This

owner manual has been prepared to help you to understand the operation of

your amplifier and to provide some information about its design and the variety of

ways it may be used.

have designed and manufactured this amplifier to faithfully and accurately

WeWe have designed and manufactured this amplifier to faithfully and accurately

reproduce music. This hand build instrument should give a lifetime of pleasure

Congratulations

tube amplifier.

and with a little care and a full understanding of the operation recommendation in

this manual the

little care and a full understanding of the operation recommendation in this

manual the

- Please take time to read this manual thoroughly before using your amplifier. -

EARTUBE

on your decision to become the proud owner of the

tube amplifier.

on your decision to become the proud owner of the

EARTUBE

should provide trouble free performance.and with a

should provide trouble free performance.

EARTUBE

EARTUBE – Mark II

HEADPHONE AMPLIFIER

- safety precautions

- usage

- connections

- Activation of the device

- Volume control

- Directional listening

- Listening by headphones

- The natural crossfeed filter

- Activation of crossfeed

- Replacing tubes

- integrated Digital

Audio Player

( an

accessoires in

EARTUBE - MARK II - USB

EARTUBE - MARK II - USB ) )

- Technical data

- CE – Confirmity

- Warranty

–

Warranty registration

–

EARTUBE – Mark II

HEADPHONE AMPLIFIER

Safety precautions

Children and minors are not to use the device and should be kept at a safe distance from

the device while it is running.

Do not run the device without the top cover in place. Voltages inside the amp can be

lethal and temperatures are high.

Please check that the mains voltage printed on the bottom panel of the amplifier

corresponds with the mains voltage in the country where you intend to use the amplifier.

Disconnect the powercord before any service to the amplifier.

In the unlikely event of a failure of the device repairs may be performed by authorized

technicians only.

Use ORIGINAL spare parts only!

Please take note of the fact that we decline product liability for damages caused by our

devices, parts and components as a result of:

Unprofessional and/or faulty and/or incorrect repairs that have been performed in

other than the approved repair facilities.

Usage of other than ORIGINAL and approved spare parts.

All devices must be operated under moderate climatological circumstances, comparable

to those under which human beings usually live. When the surrounding temperature is

too high, the device will heat up beyond its optimal parameters. This can damage the

amplifier.

Proper ventilation is needed, and the amplifier should not be covered in. Allow

approximately 3 cm of air sidewise and approximately 4 cm above the amplifier to cool

the amplifier.

Once the amplifier has arrived at its desired destination, make sure the amplifier has

ample time to adjust to the climate at its new location. It is likely that the changes in

temperature and humidity between the last location and the new one, has caused

condensation to build up somewhere in the amplifier. This can damage the device. Please

allow the amplifier at least two hours to acclimatise.

The amplifier comes fully assembled, ready to go.

The decive MUST be switched OFF while connecting it to other components.

A softstart prevents high initial currents through the cold, low impedance, heating

element. This prevents the element to break at its most narrow spot.

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!

EARTUBE – Mark II

HEADPHONE AMPLIFIER

The Eartube was developed especially for the highest-quality reproduction with

earphonesand serves very well impedances of 8 to 200 ohms. He unfolds his big strength

with roughly 3,5 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

EARTUBE – Mark II

HEADPHONE AMPLIFIER

Usage

Dear AudioValve fan,

we are delighted that you have for your audio - have bought a device from AudioValve

hobby. We know this much appreciated and will always strive to meet your expectations.

The Eartube Mark II is a logical development of our highly successful predecessor models

Eartube. This amplifier is designed for playing music through headphones in the first

place, and can act in different impedances. You can also use the amplifier but also for

playing background music about speakers. Playing music through speakers has minor

importance because the power of the amplifier is rated for headphones.

The

AudioValve - EARTUBE Mark II

is a small-power amplifier, specially designed to drive

headphones. It offers a sound quality and driving capabilities far beyond that of an

ordinary headphone socket found on a CD-player or amplifier and thus allows you to

exploit the full sonic potential of your headphones.

Due to the close contact to your ears, headphones provide an extreme channel

separation whilst listening to stereo recordings. Unlike loudspeakers, none of the sonic

information in the left channel is acoustically transferred to the right ear and vice versa.

Although this adds to the extreme high level of detail that can be achieved with

headphones, it subconsciously also introduces mental stress. The natural correlation of

stereo sound interpreted by the brain is lost.

The

AudioValve - EARTUBE Mark II

not only offers normal stereo reproduction of your

music, but it also has a facility to add some of the left channel information to that of the

right channel and vice versa. Thus mental stress is reduced and music can be enjoyed

with more ease.

By design only tubes are found inside the signal path of the amp. Solid state electronics

are only used to create a stable voltage supply.

For safety and in order to obtain the best possible results with your new headphone

preamplifier, we ask you to read these instructions carefully. The

EARTUBE

was

developed by music-lovers for music-lovers and we hope that it will serve you well for a

long time.

EARTUBE – Mark II

Connections

HEADPHONE AMPLIFIER

At the rear side of the

you to connect two different audio sources that have typical output voltages (CD- player,

cassette-player, tuner, minidisc-player, ...). The source you want to listen to can be

selected by the rocker switch at the left front side of the amp.

AudioValve - EARTUBE Mark II

two pairs of inputs ( 1 + 2 ) allow

The EARTUBE can also be used as a preamp. He has two gold-plated XLR female

connectors for even the back wall, which also vary in level with the volume control. With

two sockets, for the left and right channel, only the pin 2 is occupied hot plus phase.

Your headphone should be connected to one of the headphone - sockets on the front side

of the

simultaneously.

The sockets are intended for 6.35 mm stereo jacks. If your headphone only has a 3.5

mm jack, then use an adapter that can be obtained in most electronics or audio shops.

EARTUBE

. You can also use the sockets to connect two headphones

+ 12 hidden pages

AudioValve EARTUBE - MARK II User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual