Musical Fidelity Stereo Amplifier A308 CR User Manual

A308 CR  
DUAL MONO PREAMPLIFIER  
INSTRUCTIONS FOR USE  
Thank you for purchasing the Musical Fidelity  
A308 CR remote control preamplifier.  
Used properly and carefully, it should give you many  
years of outstanding musical reproduction.  
Æsthetically, the A308 CR Preamplifier is a perfect match for the  
A308 CR power amplifier and A308 CR CD player.  
Together, they form one of the finest hi-fi systems available today.  
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 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 1 of 9  
 
GENERAL ADVICE  
INSTALLATION PRECAUTIONS and USER INFORMATION  
CR  
Your new A308  
Pre-amplifier 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.  
CR  
Only connect the A308  
Pre-amplifier 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,  
flower vases 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 pre-amplifier is dangerous, and may cause electric shock or fire  
hazard.  
Do not place the unit near heat sources such as radiators, direct sunlight or other equipment.  
The case of this amplifier can run at high temperatures - operate the unit in a well ventilated  
area, and do not touch the side heatsink fins after periods of use at high output power.  
Do not remove covers or try to gain access to the inside. There are no internal user adjust-  
ments. Refer all service work to an authorised Musical Fidelity agent.  
NOTE: Unauthorised opening of the equipment will invalidate any warranty claims.  
CR  
There are fuses inside the A308  
Pre-amplifier. In the unlikely event that one blows, refer the  
unit to your audio dealer. Do NOT try to replace the fuse yourself as this will invalidate the  
warranty.  
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 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.  
CR  
If after-sales service is required, to help your dealer identify the A308  
serial number located on the rear panel of the unit.  
Pre, please quote the  
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 interfer-  
ence. However, if a problem persists, please contact your Musical Fidelity agent.  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 3 of 9  
 
CONNECTIONS AND FACILITIES  
5
6
7
8
1
2
3
4
9
10  
11  
12  
Front panel layout  
1
2
3
4
5
6
7
8
Power on indicator LED (blue)  
POWER on/off switch  
TAPE input select button and LED  
Mute LED  
CD input select button and LED  
PHONO input select button and LED  
TUNER input select button and LED  
AUXILIARY 1 input select button  
and LED  
Volume control knob and LEDs  
AUXILIARY 2 input select button  
and LED  
Back panel layout  
13  
14  
15  
16  
17  
18  
19  
20  
21  
22  
23  
24  
RIGHT output  
Phono MM/MC selection switch  
Phono earth connection  
PHONO input  
CD input  
TUNER input  
AUXILIARY 1 input  
AUXILIARY 2 input  
TAPE input  
TAPE RECORD output  
LEFT output  
9
10  
11  
12  
Infra-Red Receiver  
TAPE MONITOR button and LED  
IEC mains inlet  
13  
14  
15  
16 17 18 19 20 21 22  
23  
24  
POWER  
CONSUMPTION  
RIGHT OUTPUT  
20W  
LEFT OUTPUT  
PHONO  
CD  
TUNER  
AUX 1  
AUX 2  
TAPE  
TAPE REC  
MM  
MC  
50/60Hz  
THIS APPLIANCE  
MUST BE  
EARTHED  
MUSICAL FIDELITY  
CAUTION  
R
A308C DUAL MONO PREAMPLIFIER  
MOUNT UNIT ON SOLID SURFACE.  
IMPORTANT  
DO NOT REMOVE SCREWS OR COVERS  
UNDER ANY CIRCUMSTANCES.  
NO USER SERVICEABLE COMPONENTS INSIDE.  
REFER SERVICING TO QUALIFIED ENGINEER.  
SEE OWNERS MANUAL FOR FURTHER INFORMATION.  
MANUFACTURED IN ENGLAND BY MUSICAL FIDELITY  
CC  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 4 of 9  
 
REMOTE CONTROL  
REMOTE CONTROL  
The blue buttons on the remote control enable main functions of the preamplifier to be operated  
from a convenient distance. Remaining buttons on this universal handset are for use with other  
Musical Fidelity products, and have no effect on the A308 CR Pre-amplifier.  
Equivalent buttons on the remote handset have the same functions as the those on the front  
panel of the unit. Some operations are only available via the handset.  
As the remote control uses an invisible infra-red light beam, the transmitter must be pointed  
directly towards the receiver window on the front of the pre-amplifier, without visual obstruc-  
tion between them.  
Pressing the volume-up or -down buttons on the remote handset will advance the motorised  
volume control in the required direction.  
Pressing the MUTE button mutes the audio output sockets, but has no effect on the TAPE OUT  
sockets for recording. To show that the pre-amplifier is muted, the red LED on the front panel  
will light. Press the MUTE button again to cancel this function, and the red LED will go off.  
If the range of the remote control greatly decreases, replace the batteries with new ones.  
Do not mix old and new batteries - two are required, type SUM-4, AAA or LR03.  
TUNER input select  
PHONO pickup  
input select  
AUXILIARY 1  
input select  
VOLUME (UP)  
CD input select  
VOLUME (DOWN)  
TAPE input select  
MUTE button  
AUXILIARY 2  
input select  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 5 of 9  
 
CONNECTIONS  
All input and output connections should be  
made with the mains power switched OFF.  
PRE-AMPLIFIER OUTPUT  
CR  
The A308  
Pre has a pair of audio out-  
puts from RCA sockets on the back panel,  
which are controlled by the volume adjust-  
ment.  
INPUT CONNECTIONS  
CR  
The A308  
Pre-amplifier has one pair of  
phono inputs, which can be used either for  
moving magnet (MM) or moving coil  
(MC) pickups.  
TAPE RECORDER CONNECTION  
CR  
The A308  
Pre has a single tape circuit  
The phono input sensitivity requirement  
can be changed from MM to MC by press-  
ing the push-button switch located on the  
rear panel.  
Important - Do not operate the MM/MC  
switch with the volume control turned up.  
with facilities for off-tape monitoring with  
3-head tape decks (see page 7).  
Connection of your tape recorder to the  
CR  
A308  
Pre should be as follows:  
The tape deck's left and right line outputs  
are routed to the pre-amplifier's TAPE  
(input) sockets, and the tape deck's line  
Some turntable/pickup arm combinations  
are fitted with an extra wire for chassis  
earthing. This should be connected to the  
earth terminal on the back panel.  
CR  
inputs are connected to the A308 's  
TAPE RECORD (output) sockets.  
CR  
The A308  
Pre also has five “line level”  
inputs which are electrically identical, and  
therefore suitable for use with any source  
component having an output of at least  
300mV.  
The sockets on the rear panel are marked  
CD, TUNER, AUXILIARY 1, AUXIL-  
IARY 2, and TAPE, to correspond with  
function buttons on the front panel.  
Connect the left and right outputs from  
your CD player, tuner, tape deck or phono/  
record deck to the appropriate RCA input  
sockets on the back panel.  
BEFORE SWITCHING ON . . . . .  
Plug the accessory IEC mains lead into the  
rear panel socket, then the other end into a  
convenient wall outlet.  
Turn the volume control on the front panel  
to minimum (anticlockwise).  
For the best results we recommend using  
either Musical Fidelity X-LINX "no-non-  
sense" cables for this connection or the  
highly rated Nu-Vista leads with integral  
RFI suppression. Various lengths are  
available in the Nu-Vista interconnect  
range. Please contact your local dealer for  
more information.  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 6 of 9  
 
OPERATION  
STARTING . . . .  
OFF TAPE MONITORING  
Press the power button on the A308 Pre-  
amplifier - the blue LED on the front panel  
will light indicating that the unit is ready  
for use. However, for about five seconds  
no sound will be heard from your speakers,  
and the red mute LED will light to confirm  
initial mute action.  
In conjunction with a 3-head cassette deck,  
off-tape monitoring allows the user to com-  
pare the recorded sound with the original  
whilst a recording is being made. To do  
this, first select the required source in the  
normal way and start recording. The  
TAPE MONITOR button on the front  
panel can now be used to switch between  
the source sound and its recorded version.  
Unless using your pre-amplifier for off-tape  
monitoring (see paragraph opposite  
)
ensure that the TAPE MONITOR button  
has not been pressed accidently, as other-  
wise no sound will be heard through the  
speakers.  
The red LED just above the tape monitor  
button indicates that the tape monitor func-  
tion is operating.  
Note that the recorded sound is selected  
when this LED is lit. On some 3-head tape  
decks there is an additional 'tape/source'  
switch which must be in the 'tape' position  
for the above arrangement to work.  
Select the required audio input source by  
pressing an appropriate function button on  
the front panel or the remote control, and  
adjust the volume control to obtain the pre-  
ferred sound level.  
If in doubt, please refer to your tape deck  
operating manual.  
TAPE RECORDING  
To record, simply select the required source  
with the input selector button on the front  
panel. This source will now be routed to  
CR  
the A308  
Pre’s TAPE RECORD output  
sockets for recording by the external tape  
deck.  
You will also be able to hear the selected  
source through the loudspeakers.  
Note - adjustment of the volume control has  
no effect on the recording level.  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 7 of 9  
 
PROBLEMS ?  
Basic problem solving with a pre-amplifier is similar to troubleshooting 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:  
Problem  
Possible Cause  
Remedy  
No power when MAINS  
Mains plug not inserted  
Plug in securely  
POWER switch is operated fully into the rear socket  
No sound  
Tape monitor function has  
been selected (see page 7)  
Cancel tape monitor  
function by pressing the  
MONITOR button again  
Mute function is selected  
Press mute button on the  
remote control  
Wrong connections between  
Check audio lead inter-  
CR  
the A308  
fier  
Pre and ampli-  
connections between the  
pre-amplifier and amplifier  
Remote control unit does  
not operate  
POWER switch is set to OFF  
Press POWER button  
Batteries not inserted in remote Insert batteries  
control unit  
Batteries are flat  
Replace batteries - do not  
mix old and new ones  
Range of remote control has Batteries are running out  
greatly reduced  
Replace batteries - do not  
mix old and new ones  
If none of these actions effect a cure, please contact your dealer, or an authorised Musical  
CR  
Fidelity service agent. Remember, never open the case of the A308  
as this will invalidate the guarantee.  
pre-amplifier yourself,  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 8 of 9  
 
A308 CR  
Dual Mono Preamplifier  
SPECIFICATIONS :  
Output: Voltage RMS, maximum  
> 30 Volts  
Power, maximum  
Peak-to-peak output current  
Impedance  
> 5 Watts  
0.5 Amps  
50 Ohms  
Frequency response  
20Hz to 20kHz ±0dB  
10Hz to 100kHz +0, -1.5dB,  
Line inputs:  
Total harmonic distortion + noise, 20Hz to 20kHz > 0.0035% (5 Volts output, maximum volume)  
Signal / noise reference 1 Volt RMS output  
Input sensitivity for 1 Volt RMS output  
Input impedance  
104dB (“A”-weighted, at half volume)  
240mV  
47k Ohms  
Gain at maximum volume  
Overload margin  
12.5dB (4.2 times)  
31dB  
Channel separation  
> 88dB typical at 1kHz, maximum volume  
Phono input:  
20  
15  
Frequency response reference  
IEC RIAA - see graph ....  
RIAA RESPONSE  
10  
5
dB  
0
RIAA  
-5  
A308  
-10  
-15  
-20  
RIAA/IEC  
16  
32  
63  
125 250 500 1.2K 2.5K 5K  
FREQUENCY  
10K 20K  
Signal / noise ref. 1Volt RMS output  
Input sensitivity for 1 Volt RMS output  
> 95dB Moving Magnet (“A”-weighted, at half volume)  
> 85dB Moving Coil  
(“A”-weighted, at half volume)  
2.5mV Moving Magnet,  
350µV Moving Coil  
Input impedance  
Overload margin  
47k Ohms  
31dB  
Inputs:  
5 pairs line level via RCA connectors  
1 pair phono MM / MC switchable via RCA connectors  
Outputs:  
1 pair RCA connectors main output controlled by volume  
1 pair RCA connectors tape record line level output  
Power requirements:  
100 / 115 / 230V AC 50 / 60Hz (factory preset)  
20 watts maximum  
Weight: 20 kg, 44.2 lbs unit only, un-boxed  
Dimensions: 440mm, 17.3 inches wide  
143mm, 5.6 inches high including feet  
410mm, 16.1 inches deep including terminals  
23 kg, 50.8 lbs in shipping carton  
Standard accessories:  
IEC type mains lead  
Remote control handset (universal type)  
2 batteries (AAA, MN2400, LR03)  
Musical Fidelity reserves the right to make improvements which may result in specification or feature changes without notice.  
Issue 3: July 2002  
CR  
A308  
Pre  
Instructions for Use Page 9 of 9  
 

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