ekco EVH Руководство пользователя - Страница 7

Просмотреть онлайн или скачать pdf Руководство пользователя для Усилитель ekco EVH. ekco EVH 12 страниц. Headphone amplifier

Печатать страницу

FURTHER INFORMATION

Burn In New Equipment

Warming Up Before Use

Valve Lifetimes

Output Transformer

USING THE USB SOURCE

Burn in is very important. Valve components work at high voltage and temperature and when new they

should spend an extended period at those temperatures to bed in. We recommend you burn in the ampli er

for at least four or preferably twelve hours before rst using it. If you run in your equipment for this extended

period, make doubly sure that all the safety conditions covered in this manual are fully met. Supervise the

equipment for the rst hour or so and if you have to leave the unit unattended thereafter, look in occasionally

to make sure all is well.

Allow at least fteen minutes for the ampli er to 'warm up' before use. If you play loud music while the

system is cold, the output valves will not be fully operated and the ampli er will be starved of voltage and

current.

e resulting distortion is unpleasant and may cause potential damage to the ampli er's valves and

your headphones. Intensive use of the equipment before it has warmed up will shorten valve's life.

Valves contain a heating element.

of electrons. After a few years this coating will begin to wear out and performance will gradually deteriorate.

e EL84 output valves are likely to deteriorate rst but the driver valves will also eventually wear out.

As the valves start to wear out the sound will become less well de ned and a lack of dynamics and power will

become evident. Replacing the valves with a new set will fully restore the audio performance of the ampli er.

When replacing valves it is essential to use the highest quality available. Poor quality valves will adversely

a ect the sound quality and may in extreme cases damage the ampli er. When replacing the output valves,

use matched sets for best results.

Do not leave the ampli er permanently switched on or you will seriously shorten the lifespan of your valves!

After installing or changing the wiring to your headphones, keep the volume control at zero, let the ampli er

warm up and turn up the main volume gradually. If you don't hear sound, switched o immediately and

investigate.

e output transformer is designed to match the high voltage, low current conditions in which the output

valves operate to the low voltage high current requirements of headphones. Although robust, an output

transformer can be damaged and in extreme cases wrecked, by careless use. If you play a valve ampli er into

a short circuit, the output transformer will soak up a lot of energy before failing, but if the short persists the

transformer could be damaged. Operating a valve ampli er at high output level without headphones

connected can also damage an output transformer.

is ampli er must be used with a load connected, otherwise it may cause damage to the output transformer.

With the increased popularity of computers as source, this EVH USB D/A converter allows consumers to

enjoy listening to digital music sources from a computer (Windows or Mac) via USB connection.

product is USB 1.1 and 2.0 compliant.

384kHz（supports DSD64, DSD128, DSD256）and incorporates a high quality digital-to-analogue

converter (DAC).

e factory default is 48kHz input sampling frequency. With the computer in operation

the EVH USB DAC will detect input data.

Note: Windows does not support 192kHz sampling frequency. Owners of computers (Windows) are

required to install corresponding software provided in the accompanying CD-ROM. Simply follow the

software installation instructions contained.

is heats up the valve's cathode which is coated to give o a steady stream

is device supports sampling frequencies ranging from 35kHz to