Musical Fidelity KW 750 Bedienungsanleitung

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 1 of 7

kW Phono

PHONO PREAMPLIFIER

INSTRUCTIONS FOR USE

Thank you for purchasing the Musical Fidelity kW Phono preamplifier.

Used properly and carefully, it should give many years of outstanding musical

reproduction.

Aesthetically, the kW Phono is a perfect match for the

kW 750 Power Amplifier, kW Hybrid Line Level Preamplifier

and kW SACD Player.

Together they form one of the finest hi-fi systems available.

Dust regularly with a soft duster or soft brush, but be careful when using cleaning

or polishing agents - they may harm the surface finish.

If you have any questions about your audio system,

please consult your dealer who is there to help and advise.

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 2 of 7

SAFETY INFORMATION

IMPORTANT!(U.K. only)

This unit is supplied in the U.K. with a mains lead fitted with a moulded 13 amp plug. If, for any

reason, you need to cut off the plug, please remove the fuse holder and dispose of the plug safely,

out of reach of children. It must not be plugged into a mains outlet.

The wires in the mains lead supplied with this appliance are coloured in accordance with the

following code: Green and yellow..............Earth

Blue................................Neutral

Brown.................................Live

WARNING - This appliance must be earthed

As the colours of the wires of the mains lead of this appliance may not correspond with the

coloured markings identifying the terminals in your plug, proceed as follows:

The wire which is coloured green-and-yellow must be connected to the terminal in the plug which

is marked with the letter E or coloured green or green-and-yellow, or by the earth symbol:

The wire which is coloured brown must be connected to the terminal which is marked with the

letter L or coloured red.

The wire which is coloured blue must be connected to the terminal which is marked with the letter

N or coloured black.

If connecting to a BS1363 plug, a 13 amp fuse must be used.

WARNING:

Any modifications to this product not expressly approved by Musical Fidelity who

is the party responsible for standards compliance could void the user’s authority to

operate this equipment.

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 3 of 7

GENERAL ADVICE

INSTALLATION PRECAUTIONS and USER INFORMATION

Your new kW Phono is designed and built to provide trouble-free performance, but as with all

electronic devices it is necessary to observe a few precautions:

Heed all warnings shown on the back of the product.

Only connect the kW Phono to a mains outlet having the same voltage as marked at the back of the

unit.

Always ensure that when disconnecting and reconnecting your audio equipment the mains supply

is switched off.

Position the mains lead and signal interconnects where they are not likely to be walked on or

trapped by items placed on them.

Do not use near water, or place water-filled containers on the pre-amplifier, for example, a flower

vase or potted plants. If water does spill inside, immediately pull out the mains plug from the

wall socket and inform your dealer, who should then check the unit before further use.

Entry of liquid into the preamplifier is dangerous, and may cause electric shock or fire

hazard.

Do not place the unit near direct heat sources such as radiators, direct sunlight or other equipment.

Do not remove any covers or try to gain access to the inside. There are no internal adjustments or

fuses you can replace yourself. Refer all service work to an authorised Musical Fidelity agent.

Note: Unauthorised opening of the equipment will invalidate any warranty claim.

Dust regularly with a soft cloth or soft brush but be careful when using cleaning or polishing agents

- they may harm the surface finish.

The electronics in modern hi-fi equipment is complex and may, therefore, be adversely affected or

damaged by lightning. For protection of your audio system during electrical storms, remove the

mains plugs and disconnect any aerial lead.

If after-sales service is required, to help your dealer identify the kW Phono pre-amplifier please

quote the serial number located on the rear panel of the unit.

RADIO FREQUENCY INTERFERENCE (R.F.I)

This product has been tested to ensure that its operation is not adversely affected by normal

background levels of R.F.I., and that it does not itself generate excessive amounts of interference.

However, if a problem persists, please contact your Musical Fidelity agent.

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 4 of 7

CONNECTIONS and FACILITIES

1 2 3 4 5 6 7 8 9 1

FRONT PANEL

1 Illuminated feet with multi-colour

indicator LEDs (see page 6)

2 POWER mains on/off push switch

3 Power on indicator LED

4 Moving Magnet/Moving Coil

input selection button (see page 6)

5 Moving Magnet input indicator LED

6 Moving Coil input indicator LED

7 RIAA compensation indicator LED

8 IEC compensation indicator LED

9 RIAA/IEC compensation selection button (see page 6)

REAR PANEL

10 Moving Coil input socket - right channel

11 Moving Magnet input socket - left channel

12 Moving Coil input socket - left channel

13 Mains inlet socket - IEC type (10 Amp)

14 Moving Magnet input socket - right channel

15 Moving Magnet impedance selection switch

- right channel (see page 6)

16 Moving Coil LOADING selection switch

- right channel (see page 6)

17 Phono chassis earth terminal

18 Moving Magnet impedance selection switches

- left channel (see page 6)

19 Moving Coil LOADING selection switch

- left channel (see page 6)

20 Audio output socket - RIGHT channel

21 Audio output socket - LEFT channel

101112 13

14 15 16 17 18 19 20 21

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 5 of 7

CONNECTIONS

All input, output and power connections

should be made with the mains power

switched OFF.

INPUT CONNECTIONS

The rear panel of your kW Phono pre-

amplifier has two pairs of phono input

sockets, one pair for left and right moving

magnet (MM) and the other pair for moving

coil (MC) pickup cartridges.

(See also page 6, MM / MC switching).

Two sets of switches located on the rear panel

are for optimising phono performance as

follow:

MC (only):

Input loading can be changed as required by

sliding the LOADING switch underneath the

PHONO MC input socket between the 100

Ohms and 10 Ohms options. Both positions

have an input capacitance of 470pF.

MM (only):

A four-way switch underneath the PHONO

MM input socket is for matching the

characteristics of your phono pickup and lead

to the kW Phono. When all the switches are

off (up), the input impedance is 68K Ohms in

parallel with 47pF capacitance.

When each individual lever is moved

downwards, loading of the MM phono input

circuit changes as shown by adjacent graphics

on the rear panel (see also specification on

page 7). If you are not sure which

combination to select, please consult your

dealer.

Some turntables or pickup arms are fitted with

an extra wire for chassis earthing. This

should be connected to the chassis earth

terminal on the back panel.

(Note : this is not a safety earth).

OUTPUT CONNECTIONS

The kW Phono has two line level audio

outputs from RCA sockets on the back panel,

marked OUTPUTS. Using good quality

RCA co-axial audio leads, connect the left

and right outputs to the pre-amplifier input of

your audio system.

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 6 of 7

OPERATION

BEFORE SWITCHING ON . . . . .

Plug the accessory IEC mains lead into the

rear panel socket, then the other end into a

convenient wall outlet.

STARTING

Press the POWER switch button on the

preamplifier front panel - the blue LED just

above the button will light indicating that

power is applied to the unit.

LEDs in the support feet will also light red for

about six seconds, indicating that both left

and right audio outputs are muted.

Muting is then disabled, and feet illumination

then fades over approximately fifteen seconds

to yellow, showing that your kW Phono is

now ready for use.

After a period of about 35 minutes, the LED

feet colour fades to blue, confirming that the

pre-amplifier is fully warmed up.

PHONO MM / MC SWITCHING

Your kW Phono preamplifier has independent

circuits for moving magnet (MM) or moving

coil (MC) phono pickups.

To obtain the preferred input, press the MM /

MC selector button on the front panel. A

corresponding blue indicator on the front

panel will light to confirm your selection.

Each press of the button changes over input

between the two options.

CAUTION - only operate this function at low

volume setting.

RIAA / IEC COMPENSATION

As a further refinement, the phono pickup

characteristic can be adjusted to suit either

RIAA or IEC compensation curves.

Historically, the original RIAA curve defined

the low audio frequency limit as 20Hz.

The later IEC standard specifies frequency

response down to 10Hz to restrict possible

turntable rumble, or the effect of a warped

record.

Each time the RIAA/IEC button on the front

panel is pressed, the phono pickup stage is

switched alternately between the two options.

A corresponding blue indicator on the front

panel lights up to confirm your choice.

Issue 1 : January 2005 kW Phono Pre-Amplifier Instructions for use Page 7 of 7

kW Phono

PREAMPLIFIER .SPECIFICATIONS.

Output :

Voltage RMS, maximum > 43 Volts

Impedance 32 Ohms

Frequency response deviation from RIAA 20Hz to 20kHz ±0.1dB

Input :

Total harmonic distortion + noise, < 0.012% (MM, 10 Volts output)

20Hz to 20kHz

Input sensitivity for 300mV RMS output 2.9mV Moving Magnet, 500µV Moving Coil

Input impedance MC : Switched, 10 Ohms or 100 Ohms in parallel with 470pF

MM : All switches up : 68k Ohms in parallel with 47pF,

Switch no. 1 down : 47k Ohms + 47pF,

Switch no. 2 down : extra 50pF added,

Switch no. 3 down : extra 100pF added,

Switch no. 4 down : extra 200pF added

Overload margin 42dB above rated input at 1kHz (MM)

Channel separation > 64dB 20Hz to 20kHz

Channel balance error < 0.5dB typical

Signal / noise ref. 1Volt RMS output > 78dB Moving Magnet (“A”-weighted)

> 75dB Moving Coil (“A”-weighted)

Frequency response reference IEC, RIAA

- see graph . . . .

Input sockets : 2 phono Moving Magnet via RCA connector

2 phono Moving Coil via RCA connector

Output sockets : 2 RCA connectors for line level output

Power requirements : 115 /230 Volts or 100 V AC 50 /60Hz (factory preset)

25 watts maximum

Dimensions : 483mm, 19 inches wide

167mm, 6.6 inches high (including feet)

456mm, 18 inches deep (including buttons and rear terminals)

Weights : 18.15Kg, 40 lbs unit only, unboxed

23Kg, 51 lbs in shipping carton

Standard accessories : IEC mains lead - 10 Amp type

Musical Fidelity reserves the right to make improvements which

may result in specification or feature changes without notice

-20.0

-15.0

-10.0

-5.0

0.0

5.0

10.0

15.0

20.0

20.0 31.5 50.0 80.0 125 200 315 500 1000 1600 2500 4000 6300 10000 16000

RIAA

PHONO

RIAA/IEC

PHONO RESPONSE

Frequency (Hz)

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