Musical Fidelity Nu-Vista 300 Owners manual

POWER AMPLIFIER

INSTRUCTIONS FOR USE

Thank you for purchasing the Musical Fidelity special limited

edition, Nu-Vista 300 Power Amplifier.

Your unit is one of only 500 to be made and has been designed for

ultra high definition and performance. Aesthetically and electronically

the Nu-Vista 300 matches perfectly with the Nu-Vista preamplifier.

This Nu-Vista 300 uses the very high quality 6CW4 Nuvistor triode

valve, the same as in the Nu-Vista preamplifier.

Together, the Nu-Vista preamplier and power amplifier form one of

the finest hi-fi systems available.

For the best results Nu-Vista interconnects and loudspeaker cables

should be used.

If you have any questions about anything in your

audio system, please consult your dealer who is there to help and

advise you.

Nu-VISTA 300 Power Amplifier Instructions for Use. Page 1 of 12

SAFETY INFORMATION

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 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 - Radio Frequency Interference (RFI)

This hi-fi product has been tested to ensure that its operation will not be adversely affected by
normal background levels of RFI. It is possible that if this product 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 damaged 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 and aer­ial leads should be disconnected.

Always ensure that when disconnecting and reconnecting your hi-fi equipment the mains sup­ply is switched off.

Nu-VISTA 300 Power Amplifier Instructions for Use. Page 2 of 12

SAFETY INFORMATION

IMPORTANT!

ALL CONNECTIONS SHOULD BE MADE WITH THE POWER OFF.

ENSURE THE MAINS LEAD IS NOT CONNECTED TO THE MAINS
SUPPLY AND THE UNIT SWITCHED OFF BEFORE MAKING ANY
CONNECTIONS

THE NU-VISTA 300 IS A VERY POWERFUL AMPLIFIER AND IS
DESIGNED TO SUPPLY HIGH VOLTAGES AND HIGH CURRENTS
THROUGH THE LOUDSPEAKER TERMINALS. THEREFORE TO AVOID
ANY POSSIBILITY OF AN ELECTRIC SHOCK DO NOT TOUCH THE
SPEAKER TERMINALS WHEN THE UNIT IS BEING USED.

Nu-VISTA 300 Power Amplifier Instructions for Use. Page 3 of 12

INTRODUCTION

u-Vista 300 Power Amp "breaks the

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rules" to offer ground-breaking per-

formance

he Nu-Vista 300 power amp is the heir

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apparent to the great tradition of British
electrical and mechanical engineering
excellence. It is also proof positive that
those who understand the rules of amplifier
design best, can break them with the best
results.

esigned to complement the Nu-Vista

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preamplifier, which notched up new
preamp standards, the Nu-Vista 300 power
amp sets new standards for power ampli­fiers. This is achieved in several ways:
through the use of a sophisticated, hybrid
nuvistor circuit, which can produce huge
peak currents and massive power levels. By
using a unique choke-regulated power sup­ply. And by flying in the face of convention
in the physical layout of such a massive
power amp.

he results speak for themselves. The

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Nu-Vista 300 top end is extended and
beautifully clear, the midrange is pure and
as transparent as the finest optical crystal
and the bottom end extends down virtually
to infinity. Resolution and definition have
integrity to electron -microscope-level
detail. And for all practical purposes, the
Nu-Vista 300 power amp has no dynamic
range limits.

esign objectives of the Nu-Vista 300

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power amp

1. Sound quality

2. Low distortion with low feedback

3. High power and high current

4. Stability margins

5. Consistency

6. Build quality and aesthetics

1) Sound quality

he Nu-Vista 300 power amp sets new

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standards for audio electronics because
it is able to transfer the purity and clarity of
the Nu-Vista preamp to the loudspeakers.
To achieve this, the Nu-Vista 300 has very
wide bandwidth coupled with low distortion
and a huge dynamic range.

ue, in part, to its very high input imped-

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ance and sophisticated circuit, the top
end of the Nu-Vista 300 is remarkably lucid
and extended. There is no grain, no distor­tion, no harshness of any sort - and no
power limit. The Nu-Vista 300 simply
delivers to the loudspeakers an amplified
version of exactly what is fed into it.

he midrange is simply pure, with no

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colouration and no grain. The effect is
like looking through the purest form of opti­cal crystal. You know it's there, but it's vir­tually invisible. Similarly, with the Nu­Vista 300, there are no intrusions.

he Nu-Vista 300 is a big power amp

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with unlimited headroom, massive
power, high current, low distortion, high
stability margins and obsessive attention to
magnetic flux. This is not an amplifier for
the timid.

Nu-VISTA 300 Power Amplifier Instructions for Use. Page 4 of 12

he bottom end is profoundly extended.

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It is also extremely fast, with not a hint
of overhang. It has speed, slam and attack.
It is all but impossible to clip or overdrive
the Nu-Vista 300 in the bottom end. The
real question is: can your loudspeakers han­dle an amplifier which, in practice, has no
dynamic limits.