Rega Ios Manuale utente

Ios english manual:Ios english manual.qxd 07/08/2008 10:35 Page 1

Contents

Introduction..............................................................................1

Design Innovation.................................................................2-3

Installation................................................................................3

Ventilation................................................................................4

Connections.............................................................................4

Earthing...................................................................................5

Cartridge Selection..................................................................6

Powering Up............................................................................7

Controls.............................................................................8- 10

Troubleshooting................................................................11-14

Specifications....................................................................15-16

Owners Log...........................................................................17

Mission Statement

Rega’s philosophy is to make high quality products at sensible prices, as a means

of reproducing music as faithfully as possible. Rega is committed to the design and

development of new and existing products, both in hi-fi and other areas, that will

perpetuate Rega’s values of quality and value for money.

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Introduction

The function of a phono pre amplifier is to match the output

from a pick up cartridge to the input of a line level amplifier. It

is required to amplify the very low signals produced by the

cartridge and also to equalise the in accordance with RIAA

record cutting standard.

Rega believes that moving coil and moving magnet cartridges

require different types of phono pre amplifiers to achieve

optimum performance.

The Ios is therefore dedicated to moving coil cartridges and

avoids compromises.

We have avoided including any superfluous gadgets as they

obstruct the signal path and degrade the sound quality.

The Ios phono pre-amp incorporates remarkable and

innovative design ideas. For those interested in the technical

details, these innovations are described more fully in the

nextsection of this manual.

Alternatively, you can simply switch on, sit back and let your

Ios speak for itself.

Please Note: Read this manual with care - failure to do so may result in operational

difficulties not covered by any warranty.

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Design Innovation

The Rega Ios is a four stage all symmetrical amplifier. To

provide optimum performance it is dedicated to amplifying the

very low level signals that are generated by moving coil

cartridges.

The first stage uses a 1:10 step-up transformer, which can be

optimised to the cartridge by the selection of the correct

loading and zobel DC resistance correction network connected

across the MC transformer secondary.

The second stage is symmetrical compound pair class A

amplifier, using paralleled low noise Hitachi transistors in the

input stage. This drives the passive high frequency part of the

RIAA equalisation stage.

The third stage is a symmetrical class A differential amplifier

with a common base driver stage; this is also used as the

active amplifier in the low frequency part of the RIAA

equalisation stage.

The fourth stage is the active filter, this configuration uses the

same circuit as found in the second stage. The filter element

uses a very high bandwidth operational amplifier gyrator as the

simulated inductance part of the tuned filter.

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The power supply is a symmetrical discrete tracking power

supply using fast diodes and a low noise voltage reference.

Each stage has it’s own localised power supply, and LED

referenced current generators.

Very high quality, polyproplene capacitors have been used in

the signal path. 1% tolerance polypropylene capacitors are

used in the RIAA EQ stages and audio grade capacitors are

used in the rest of the circuit.

Installation

Ios will work well on most surfaces, such as a shelf or a table,

provided there is sufficient air around it to prevent overheating.

To avoid any possible magnetic interference and increased

hum levels, site the Ios as far away from the turntable as the

tonearm lead will allow. If possible, try to place Ios to the left of

the turntable. Ideally the equipment should be placed next to

one another in a line (Ios to the right). This keeps Ios’s most

delicate electronics away from other transformers.

Try not to stack other Hi-Fi components, (tuners, cassette

decks, power amps or CD players), on top of, or underneath

Ios. If this is unavoidable, use an equipment stand.

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entilation

The heat produced by the amplifier, although minimal, is

dispersed to the air by the case, particularly the underside.

Ensure that the case has an uninterrupted air passage around

it.

Connections

The inputs and outputs are made via RCA (phono) type

connectors. The input and output sockets are marked by colour

to indicate left and right channels, Black for LEFT and Red for

RIGHT.

If your turntable has a separate Earth wire, firmly connect it to

the terminal provided on the rear panel. (see illustration above)

NB. Always switch both pre and power amps off before

changing the leads.

Phono inputs Phono outputs Power input socket

Turntable earth connection

View of rear panel

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Earthing

The Ios uses a Class I earth system, where the case metal

work and earth screen between the primary and secondary

windings in the toroidal transformer, are connected to the line

safety earth, by means of the mains lead.

The internal signal earth is linked to this earth by the use of a

network to eliminate the risk of earth/ground loops.

This earthing method provides a safe and efficient discharge

path for any static charge generated by the cartridge.

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Cartridge selection

The Ios phono pre amplifier is not suitable for use with any

Moving Magnet (MM) cartridges, it can only be used with

moving coil (MC) cartridges.

The Ios has been designed to work with most manufacturers

moving coil (MC) cartridges.

There are five different input load settings, select the required

load to match to that specified by the cartridge manufacturer.

The Ios has five different DC resistance settings 1-5.

Note: It is permissible to try different loading conditions and

resistance settings as sometimes changing the load gives a

different sonic performance more suited to your personal taste.

These variables are explained in greater detail in the controls

section of this manual.

Your Rega dealer will be able to give guidance to help match

your specific cartridge to the correct gain settings.

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Powering Up

Ios is activated by depressing the On/Off button situated to the

left of the control panel. The power indicator LED will glow

steadily.

Always activate Ios before the power amplifiers and de-

activate after they have been switched off.

After switching off, the indicator will extinguish.

Due to the nature of the circuit topology, there is a short period

immediately after switching on when the quiescent current has

not stabilised. This condition results in reduced output from the

pre-amp.

This Rega amplifier circuit has been carefully designed to work

with a minimal “ warm up” period. Some manufacturers and

retailers may recommend leaving amplifiers permanently

switched on, Rega cannot condone such practise in these

environmentally sensitive times.

We would recommend that your Rega amplifier is always

switched off after use. Full sound quality is attained after less

than ten minutes (a process speeded up by playing music!)

Ios english manual:Ios english manual.qxd 07/08/2008 10:35 Page 9

Controls

The Load Switch

The DC resistance of the cartridge affects the transient or

square wave response of the transformer; this network has to

be optimised to get the best out of the cartridge and

transformer combination.

There are five different input load settings of 50, 100, 150, 300

& 400

Ω

. Select the required load to match to that specified by

the manufacturer in the cartridge specifications. It is

permissible to try different loading conditions as sometimes

changing the load gives a different sonic performance more

suited to your personal taste.

The 100

Ω

setting is optimised for the Rega Apheta cartridge.

Load switch

Filter switch DCΩswitch

On/Off button ain setting

Filter On/Off

Ω

Ios english manual:Ios english manual.qxd 07/08/2008 10:35 Page 10

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