What is stereo?

There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.

H.H. Scott '59

Musical Fidelity X-P100 pre amplifier


X-P100 remote control Class A preamplifier.

The X-P100 is a new model based on our innovative and now very highly regarded Nu-Vista valve preamp but using Field Effect Transistors in place of the Nuvistor valves used in that model.

These transistors were carefully selected from the great many alternatives we tested because of their close similarity in both measured performance and sonic fingerprint to the 6CW4 Nuvistor. We feel that the X-P100 offers a very similar level of sonic fidelity to the Nu-Vista but at the reduced cost afforded by the choice of FET devices.

The X-P100 preamp also features full remote control and a high quality discrete MM phono stage.


External Power Supply and  Setting Up

The X-P100 is supplied with an external power supply which is connected to the main unit via an umbilical lead terminated in an XLR/Cannon type plug. This lead should be connected to the socket on the back of the X-P100 main unit.



All connections should be made with the power OFF.

The X-P100 has 5 line level inputs - CD, Tuner, Aux1, Aux2 and Tape, plus an MM phono input. All line inputs are electrically identical and are suitable for use with any source component with an output voltage in the hundreds of millivolts (mV). This includes CD players, tuners, tape machines and the audio outputs of video recorders, televisions, DVD and Laser Disc players etc.

The high quality phono input caters for turntables fitted with a Moving Magnet type cartridge or other cartridges with an output voltage in the range 1 to 5mV.


Tape Recording

The X-P100 has a single tape circuit with facilities for off-tape monitoring with 3-head cassette decks.

Connection of your tape machine to the X-P100 should be as follows. The tape machine's Tape/Line outputs go to the X-P100's 'Tape' input sockets. The tape machine's Tape/Line inputs go to the X-P100's 'Tape Record' output.

To record simply select the required source with the source selector knob on the front panel. The selected source will now be sent to the 'Tape Record' output for recording by the attached tape machine.


Remote Control

The X-P100 features Infra Red remote control of volume, input selection and mute functions via the supplied remote control handset. The Infra Red receiver is the small red lens marked I.R. situated on the front panel, it is a good idea to place your X-P100 such that there is an unobstructed line-of-sight to this lens from around your listening room.



Inputs:  5 Line, MM phono

Total Harmonic Distortion:

less than 0.007% (20 Hz - 20 kHz unweighted)

Less than  0.004% (20 Hz - 20 kHz ‘A’ weighted)

Frequency Response:  20 Hz - 20 kHz ±0.2 dB

Signal-to-Noise Ratio

MM Phono:  better than 72 dB unweighted

MM Phono :  better than 78 dB 'A' weighted

Line : better than  81 dB unweighted

Line : better than  90 dB ‘A’ weighted

Dimensions (W x H x D)  230 x 110 x 315mm, Width and height include feet

Power Consumption: 20 watts (maximum)

Standard accessories:

Remote control handset

X-P100 power supply unit

IEC type mains lead

2 x batteries (AA, SUM-3, CR6)

Musical Fidelity X-AS100 power amp

Musical Fidelity X-AS100 Power Amplifier.

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

Aesthetically and electronically the X-AS100 matches perfectly with the X-P100 Preamplifier, X-RAY CD player and X-PLORA tuner. Together, they form one of the finest hi-fi systems available.

The X-AS100 has been designed to be switched on continuously. The PSU should be positioned as far away from the X-AS100 as possible. We suggest that the PSU is placed on the floor near the mains outlet.

Dust regularly with a soft duster or soft brush but be careful when using cleaning or polishing agents - they may harm the surface finish



The X-AS100 is a stereo amplifier which can if required be mono for use in passive bi-amping systems.

The X-AS100 can be used with a preamplifier or any line level source which has a volume control. We highly recommend the matching X-P100 or Nu-Vista Preamps available from Musical Fidelity as an excellent choice.



Power Output: 100 watts per channel, 8

Total Harmonic Distortion:

less than 0.005% (at 1 kHz)

Less than  0.04% (20 Hz - 20 kHz unweighted)

Less than  0.003% (20 Hz - 20 kHz 'A' weighted)

Frequency Response:  10 Hz - 70 kHz ±1 dB

Input Sensitivity:  900 mV

Signal-to-Noise Ratio

Better than  106 dB unweighted (ref 100W)

Better than  117 dB ‘A’ weighted (ref 100W)

Better than  86 dB unweighted (ref 1W)

Better than  97 dB 'A' weighted (ref 1W)

Channel Separation: better than 90 dB( 20 Hz-20 kHz)

Power Consumption: 450 watts (maximum)

Dimensions (W x H x D): 230 x 110 x 330mm (Width and height include feet, depth include terminals)

Standard accessories

 X-AS100 power supply unit

IEC type mains lead

SIgnet TK33 headphones

Electret Condenser Stereophones

The time has finally arrived when stereophones can assume their rightful importance as essential elements in critical high fidelity systems. And the same standards of excellence normally applied to other prime components can now be applied to these transducer.

Whether you inted your stereo phones for critical monitoring of live recordings, private listening where loudspeakers might intrude, binaural broadcasts and recordings, or simply to enjoy them for their own virtues as superb reproducers, their quality should not compromise the rest of your music system.

While the bulk of stereo listening has traditionally employed loudspeakers, stereophones now offer the potential for performance that can actually exceed that of loudspeakers in every essential respect. Stereophones have an advantage, of course, since they need not move a roomful of air, not overcome awkward acoustic conditions. By providing linear response at the ears, with full dynamic range, stereophones can be the reproducer of choice to fully enjoy the subtle delights of a well-engineered direct-to-disc recording. And recent experiments in binaural sound are predicted on stereophone listening exclusively.

While others may consider stereophones as an accessory, at Signet, we prefer to thing of them as an alternative listening technique. Just as viable as loudspeakers, and with advantages of their own. And until you experience Signet stereophone listening, you may not be aware of the clarity, transparency, response, and freedom from distortion that can be achieved. These advantages stem from two essential attributes of the Signet concept; advanced knowledge of transducer design, and uncompromising standards of performance.



Type:  Dipolar Electret Condenser Headphones

Frequency Response:  10 - 22,500 Hz ±2 dB, 20-20,000 Hz

Sensitivity (1 kHz, 0 dB = 0,0002 µBar):  100 dB at 1 V

Total Harmonic Distortion:  01% (at 110 dB SPL)

Matching Impedance:  4 - 16

Ear pads:  Porous Vinyl

Cord:  2,5 m (8,2 ft) with special plug


Without Cord :  210 grams (7,4 oz)

With Cord :  275 grams (9,7 oz)

Diaphragm:  2 microns thick, high-compliance film

Voice Coil:  40 micron Silver-copper self-supporting

Impedance Matching Adapter

Dimensions (H x W x D):  140 x 60 x 220 mm (5,5" x 2,4" x 8,7")

Adapter Weight:  1620 grams (4 lbs)

Adapter Cable:  1,2 m (3,9 ft) 4 conductor


Signet TK22 headphones

Moving Coil Dynamic Sterophones

Like other Signet products, Signet Stereophones are created in our electroacoustic laboratory. Assembly is painstaking, quantities are limited, testing is rigorous. And the standards reflect the highest technology available. There are but two Signet models; a moving coil dynamic and an electret condenser. Both benefit from the resources of one of the largest transducer manufacturers in the world. Yet each is also the product of a small group of skilled and dedicated specialists, the Signet Group.



Type:  Moving Coil Dynamic Headphones

Frequency Response; 20 - 20,,, Hz

Sensitivity (1 kHz, 0 dB = 0,0002 µBar):  96 dB at 1 mW

Total Harmonic Distortion:  0,4% (at 110 dB SPL)

Matching Impedance:  4 - 16

Ear pads:  Fabric-covered Foam

Cord:  3,5 m (11-1/2 ft) with 1/4" stereo phone plug


Without Cord :  205 grams (7,2 oz)

With Cord :  260 grams (9,2 oz)

Diaphragm:  20 microns thick, Polyester dome

Voice Coil:  40 micron Silver-copper self-supporting