Ashdown ORIGINal VALVE PRE 사용자 설명서 - 페이지 4

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USER GUIDE

ASHDOWN ORIGIN

VALVE PRE AMP PEDAL

Power Supply

The ORIGINal Pre-amplifier requires a Linear Isolated High quality Regulated power supply that

can supply a current 300mA at a voltage of 15-18V DC Centre Pin NEGATIVE for the fitted 2.1mm

connector socket. Since most Professional pedal board power supplies have outputs at 9V and

18V the pedal is marked at 18V. The pedal reduces the incoming power supply down to 12v

suitable to drive the Valve and internal circuits, for the internal stabilisation to be fully effective the

connected power supply should be between 15-18V DC as stated...

In extreme cases the pedal will operate on 9v but this will be accompanied by an increase in noise

and the Valve drive will not be as effective. For those of you that do not own a Pedal Board and

power supply unit a suitable Linear Isolated supply has been included - this is 15V DC Centre Pin

NEGATIVE and for use ONLY with the Original Pedal. The use of switching type adaptors is not

recommended as these invariably generate unwanted noise and are sometimes NOT completely

ISOLATED from the mains supply.

General Points

The DI output of this pedal is set to a standard nominal level of 0dB (0.775mV) , dependant of

course on the setting of the Input control .This output is Transformer Isolated and is true balanced

line, it may be used with mixing desks with Phantom power without ill effect.

Depending on what other Equipment is also connected to the pre-amplifier the Ground lift may

have to be used. For instance when connected to an additional amplifier which is itself connected

to ground the ground lift will have to be used to avoid the loop that would exist between the two

pieces of equipment. If the pedal is being used to drive only a mixing desk then the ground lift

should not be used thereby grounding the pedal and avoiding induced mains Hum.

Noise sources

Guitars in general make fantastic Aerials and are able to pick up all sorts of interference which can

find its way through any connected equipment, such sources include, Mobile Phones, Bluetooth

devices, Wi-Fi Transmitters and Computers, Led lighting and switch mode power supplies.

Interference in the home can come from additional sources such as refrigerators and Central heat-

ing turning on and off, these produce unwanted clicks and pops which the guitar will pick up with

monotonous regularity, If you are working or recording in such an environment it is a good idea to

switch off as much as possible and position yourself and the instrument for least interference.