Musical Fidelity F225 Manuel utilisateur

Instructions For Use. Page 1F25

F25 REMOTE CONTROL STEREO

PREAMPLIFIER

INSTRUCTIONS FOR USE

Thank you for purchasing the Musical Fidelity

F25 Preamplifier. Used properly and carefully, it

should give you many years of outstanding musical

reproduction.

The F25 is the result of many years painstaking

research and development and is designed for

ultra-high definition performance. The F25 is

equipped with full remote control facilities.

The F25 operates in Class A. It has sound quality

equal to, or better than any preamplifier currently

available. We hope you will be delighted with your

purchase.

Dust regularly with a soft duster or soft brush but

do not use cleaning or polishing agents - they may harm

the surface finish.

If you have any questions about anything in your

audio system, please consult your dealer who is there

to help and advise you.

Instructions For Use. Page 2F25

PLEASE READ

IMPORTANT!

This unit is supplied in the UK with a mains lead fitted with a moulded 13 amp

plug. If, for any reason, you need to cut off this plug, please observe the following

safety precautions. Please dispose of the cut-off plug safely. It must not be plugged

into a mains power supply.

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

cordance 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 corre-

spond 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 termi-

nal 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 10 amp fuse must be used.

WARNING - Radio Frequency Interference (RFI)

This hi-fi product has been tested to ensure that its operation will not be ad-

versely affected by normal background levels of RFI. It is possible that if this prod-

uct is subjected to abnormally high levels of RFI the unit may be susceptible and not

perform as expected. In the unlikely event of this happening on a regular basis,

please contact Musical Fidelity's service department.

The unit has also been tested to ensure that it does not radiate excessive levels

of RFI that could affect other pieces of electronic or electrical equipment.

The electronics in modern hi-fi equipment is complex and hence may be dam-

aged by lightning. It is possible that during electrical storms the operation of some

equipment may be adversely affected. For complete protection of your hi-fi system

during such storms, mains plugs should be removed from sockets and aerial leads

disconnected.

Always ensure that when disconnecting and reconnecting your hi-fi equipment

the mains supply is switched off.

Instructions For Use. Page 3F25

þHeed all warnings on the back of

the unit.

þþ Place your F25 where there is

adequate ventilation.

þþ Only connect the unit to a power

supply of the type marked on the back

of the unit.

þþ Position the power supply lead

and signal interconnect leads where

they are not likely to be walked on or

trapped by items placed on them.

þþ Fit 2 x “AA” size batteries into

the remote control. These must be

alkaline types. Please observe the

correct polarity of + and - when fit-

ting.

ýý Do not use near water.

ýý Do not place the preamplifier

near direct heat sources such as radia-

tors or other equipment that produces

heat.

ýý Do not remove any covers or try

to gain access to the inside. The war-

ranty will be invalid if the unit has

been tampered with. There are no

user adjustments within. Refer all

service work to an authorised Musical

Fidelity agent.

ýý There are 3 fuses in the F25. In

the unlikely event that one blows, take

your F25 to your audio dealer. Do

NOT try to replace the fuse yourself

or you will invalidate the warranty.

BEFORE YOU SWITCH ON

You should make all connections to the F25 before switching on.

Follow this routine before you listen for the first time, and each time you

change any connections.

1Check all the inputs and outputs to the F25.

2Then check again.

3Turn the volume control to nil.

4Now you can switch on the power and carefully advance the volume to

the level you want and enjoy the music.

INSTALLATION

INSTALLATION PRECAUTIONS

Your new F25 is designed and built to provide trouble-free performance but it

is necessary to observe a few precautions. Please ensure that you have complied with

them before you connect any AC power to your amplifier. Retain this guide for

future reference.

Instructions For Use. Page 4F25

CONNECTIONS AND FACILITIES

REMOTECONTROL

AMute button

BVolume Up/Down buttons

CSourceselectorbuttons

FRONTPANEL

1Power indicator LED

2Power on/off switch

3Phonoinputselector

4CD input selector

5Tunerinputselector

6CDV input selector

7Tape input selector

8Aux input selector

9Remoterecieverlens

BACKPANEL

10 MovingMagnet (MM)Phono input

11 Phono/ChassisEarth

12 MovingCoil (MC)Phono input

13 CDinput

14 Tunerinput

15 CDVinput

16 Tape input

17 Auxiliaryunbalanced(RCA/phono)input

18 Auxiliarybalanced(XLR/Canon)input

19 Processorloop -inputfrom processor

20 Processorloop-outputtoprocessor

21 Tape record output

22 Unbalanced (RCA/phono) main outputs

23 IEC mains inlet/ fuseholder

24 Balanced (XLR/Cannon) main outputs

25 Auxilliaryinputtypeselector

26 MCloadingswitch

27 RIAA/IECEqualisationcurveselector

28 Phono input select MM/MC

29 MM loading dip switches

1 2 3 4 5 6 7 8 9

29 28 27 26 25 24 23

11 12 13 14 15 16 17 18 19 20 21 22

Instructions For Use. Page 5F25

CONNECTIONS

FOR THE BEST RESULTS:

We strongly recommend that you use the F16 or F19 power amplifiers manufac-

tured by Musical Fidelity.

These are designed for perfect electrical and sonic compatibility with the F25.

When paired, they produce truly extraordinary results which afford an unprecedented

level of musical communication, articulation and dynamics.

One of the design aims of the F25 was that it should be relatively insensitive to

the effects of interconnect cables. Although it is important that you use low imped-

ance, low capacitance cables, the exact make and model are not too important. Simi-

larly, a lot of fuss is made about different types of plugs and sockets; once again, the

F25 is very insensitive to these differences.

A large amount of time, effort, money and energy has been expended to ensure

that your F25 will produce optimal results with almost any cables or connectors. We

hope that this makes your installation and listening easier and more enjoyable.

CONNECTIONS

All connections should be made with the power off. The F25 has six inputs.

These are all clearly labelled on the back panel. The F25 also has a tape record out-

put. This should be connected to the input of a tape deck.

PHONO STAGE OPTIONS and SWITCHES

The phono input select toggle switch is used to select moving coil or moving

magnet input.

The push button marked equalisation is used to select the bass filtering of the

input. The original RIAA curve was modified some years ago by the IEC to include

an earlier bass roll-off, which prevents excessive cone movement with some speaker

systems. Ultimately, the choice of curve is up to you.

The toggle switch marked MC input loading is to select the impedance seen by

the moving coil cartridge, either 10 or 100 Ohms. MC cartridges are not particulalrly

sensitive to loading but you may find that one or the other setting suits your cartridge.

The dip switches are used to select the capacative loading on moving magnet

cartridges. This should be set by ear, as the total capacitance seen by the cartridge

will be dependent on the arm leads etc. Basically, up to a point, the higher the capaci-

tance, the smoother the sound. The left hand switch selects either 47KOhms or

68KOhms impedance. (47K normally)

LINE INPUTS

The five line inputs on the F25 are at the same level. The CD, tuner, CDV, tape

and aux. are all interchangeable, and any source with an output level in the The F25

must be connected to a power amplifier, such as the Musical Fidelity F16 or F19.

There are two pairs of sockets which can be used to output the signal from the preamp

Instructions For Use. Page 6F25

CONNECTIONS

to a power amp. One of these pairs are normal RCA type sockets. These are the

unbalanced outputs sometimes known as single ended outputs. The other pair of

sockets are the XLR balanced outputs. When the latter is used with a power ampli-

fier with balanced XLR inputs, benefits in terms of noise and dynamic range should

be apparent.

OPERATION

All operational functions of the F25, with the exception of the power on and

off, can be controlled via the supplied remote control.

To select any input, simply press the appropriate button on the remote control.

The volume control is motorised, so that when you press ‘+’ or ‘-’ on the remote, the

control will rotate in the required direction.

The LED in the volume control knob indicates the current setting of the control.

To temporarily turn off the sound, in order to answer the telephone for instance, press

the MUTE button on the remote control. The LED will change colour to red, indicat-

ing the muted state.

It is advisable to acquire the habit of turning down the volume to zero before

switch off.

EXTERNAL PROCESSOR CONNECTIONS

The F25 is fitted with external processor ‘out to’ and external processor ‘in

from’ sockets. As supplied, these will be connected by two shorting links. These can

easily be removed by simply pulling them out.

Note: When you do this the pre-amplifier and power-amplifier stages will

be separated, thus if no connection is made from 'out to' to 'in from' via a proc-

essor for instance no sound will be heard.

The most likely use of these sockets, would be to add a sound processor of some

kind to your system. This would be connected with its output to ‘input from’ on the

F25, and its input to ‘output to’. This device would then be permanently in the

circuit, and would affect the sound on all inputs.

Sound processors which are possible candidates for insertion are:-

·Surround Sound units.

·Digital Sound Processors (DSP)

·Graphic or Parametric Equalisers

·Impulse Noise Reduction Systems.

Please be aware that the potential to change the sound from that intended by the

producer of the recording is quite great with all of these devices, and that their pres-

ence in the circuit will degrade the sound quality of the system. The extent to which

this occurs will depend on the quality of the processor.

Instructions For Use. Page 7F25

CONNECTIONS

REMOTE CONTROL

The battery powered handheld remote control will perform the following func-

tions:

a. Mute

b. Volume control +/-

cInput selection

The mute control operates the output relay. When this control is used, the

output is muted and the dual colour LED in the volume control knob turns red.

When the mute button is pressed again, the output is unmuted and the LED turns

back to green.

The select and volume function buttons are self explanatory.

F25 LEDS

The F25 has three types of LED on the front panel:

a. Mains on/off (green)

b. Input indicator (red)

c. Status indicator (dual colour: red and green)

The on/off indicator is self explanatory. When the unit is switched on, the LED

is on.The input status indicator similarly. The LED above the input selected illumi-

nates.

The dual colour LED in the volume control knob is slightly more complex. It

has two functions. When switched on, it indicates the output relay status. Red for a

few seconds, then when the relay is open it turns green. There will be no output

from the F25 until this LED is green. The second function of the dual colour LED in

the volume control knob is to indicate mute status. When you press the mute button

on the remote control the F25 will mute and the LED will change to red. It will

remain this way until you press the mute button again when it turns back to green.

BALANCED/SINGLE ENDED OUTPUT MODE

The F25 can provide a balanced or a single ended out put. Simply plug your

leads into the XLR sockets for balanced operation, or plug your RCA phono leads

into the RCA phono sockets for single ended operation.

MUTE FUNCTION

The F25 remote control has a mute function. This cuts the output from the F25.

If, by mistake, you touch the mute button, there will be no output from the F25 and

you might think it has gone wrong. It hasn’t! Just press the mute button again until

the status LED turns green.

Instructions For Use. Page 8F25

Basic troubleshooting of an amplifier is similar to troubleshooting of any other

electrical or electronic equipment. Always check the most obvious possible

causes first. To give you a few ideas of what to look for, check the following:

TROUBLESHOOTING

Problem Probable Cause Remedy

No power when POWER

is pressed Mains plug not inserted

correctly Plug in securely

Hum when listening to

turntable Incorrect earthing of pickup

arm cable Either connect or

disconnect the pick-up

arm earth wire to the

earth terminal on back

panel

No sound Volume control is set to

minimum Turn up the volume

"Mute" pressed on remote

control Press "mute" again

Power amplifier is not

connected Check cables and power

amplifier

Speakers are not connected Check speaker cables

Wrong input is selected Check input selection

Sound is not precise,

lacking in bass and stereo

image

Speakers are connected out

of phase Make sure that both

speakers are connected

correctly

Remote control operation

is not possible Amplifier's power switch is

set to off Set switch to on

Batteries not inserted in

remote control unit Insert batteries

If none of these actions effect a cure, please contact your dealer, or an author-

ised Musical Fidelity service agent. Remember, never open the case of the F25

yourself, as this will invalidate the guarantee.

Instructions For Use. Page 9F25

SPECIFICATIONS

Improvements may result in specification or feature changes without notice.

Photos and illustrations may differ slightly from production models.

F25 REMOTE CONTROL PREAMPLIFIER

THD < 0.01%

Frequency response 20Hz - 20kHz +/- 1dB

Inputs 4 Line, Tape, Phono (MM/MC)

Input sensitivity Line (for 775mV out) 200mV

Input sensitivity Phono (for 775mV out) MM 3mV, MC 300mV

S/N Ratio : Line >85dB

: Phono MM >75dB

: Phono MC >60dB

Tape output Dependent on input level

Power consumption 10 Watts

Power requirements 100/115/230 Volts, AC 50/60Hz

(Factory Preset for country)

Dimensions 480 x 120 x 340mm (W x H x D)

Height includes feet

Weight 7.4 kgs. (unpacked)

9.5 kgs. (packed)

Standard accessories Remote Control Unit

Battery 2 x (SUM-4, “AA”,

“R03”)

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