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Resumen del manual
It provides outputs for a pair of loudspeakers and for headphones, and low level signals suitable for recording on to tape. Although designed for simplicity of operation the Alpha has comprehensive tone control facilities which enable good results to be obtained with a wide variety of programme material. Mains connection Check that the amplifier voltage setting as indicated on the back panel is the same as the local mains supply. The wires in the mains lead are coloured in' accordance with the following code: GREEN AND YELLOW.........EARTH BLUE........................NEUTRAL BROWN...........................LIVE AS THE COLOURS OF THE WIRES IN THE MAINS LEAD 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 by the letter E or by the safety earth symbol i or coloured GREEN or GREEN AND YELLOW. The wire which is coloured BLUE must be connected to the terminal which is marked by the letter N or coloured BLACK or BLUE. The wire which is coloured BROWN must be connected to the terminal which is marked by the letter L or coloured RED or BROWN. If the mains plug is fused fit a 5A fuse. Rear panel connections Connect the system together as shown in the diagram. All inputs and tape outputs are via RCA phono connectors. The disc input is suitable for moving magnet and high output moving coil cartridges. The CD input is specifically designed to match CD players and so has a lower sensitivity than the other line inputs. The CD and VIDEO inputs may also be used as general purpose inputs for sources with a suitable line level output - e.g. a second tape recorder. Loudspeaker outputs The outputs are suitable for driving loudspeakers in the range 4-16 ohm impedance. The loudspeaker sockets accept the 4mm plugs provided. The upper three terminals are for the left hand speaker and the lower three for the right hand speaker. One side of the speaker (normally the - side) should be connected to the centre (black) terminal; the other, (the + side) may be connected to either the direct or the switched terminal (both red). When the “direct" output is used, loudspeakers and headphones may be used together; when the "switched" output is used, insertion of the headphones will automatically turn off the loudspeakers. Loudspeaker fuses These are 2.0 amp fast blow 20mm x 5mm diameter fuses. They may blow if the amplifier is: - run continuously at very high level into the correct loudspeaker load - run at high level into a loudspeaker of too low an impedance (less than 4 ohms) - run into a short circuit They are user-replaceable and two spares are provided. However, if they blow consistently in the absence of any of the above conditions please consult your dealer. To remove a fuse from its holder simply push in, twist 1/4 turn anticlockwise and pull the fuse out. DO NOT replace with a fuse of greater value than 2.0 amps (or with a "slow blow” or "antisurge” fuse) since this will endanger the amplifier and your loudspeakers and invalidate your guarantee. Front panel controls From left to right the controls are: 1 Input The input selector switch selects which input signal is fed to the loudspeakers and headphones. The selected signal is also fed to the "tape out" sockets. 2 Volume The volume control adjusts the sound level for both the loudspeakers and headphones. 3 Bass The bass control cuts low frequencies when turned anti-clockwise and boosts them when turned clockwise. The flattest response is obtained when the control is in the centre “click” position. 4 Treble The treble control cuts high frequencies when turned anti-clockwise and boosts them when turned clockwise. The flattest response is obtained when the control is in the centre "click” position. 5 Balance The balance control is used to move the stereo sound image to the left or right. It can be used to compensate for imbalances in room acoustics or input signals. 6 Phones The headphone socket accepts any dynamic headphones fitted with a standard 1/4 inch stereo jack plug. The headphones may mute the loudspeakers, or not, as required (see loudspeakers). The output is not suitable for driving most electrostatic headphones. These are normally connected to the loudspeaker outputs. 7 Power The amplifier is turned on by pressing the mains power switch. The red light indicates that the power supply in the amplifier is operating -it will continue to glow for a short time after the amplifier has been switched off. Tape recording and replay The tape input/output is designed to suit most reel-to-reel and cassette tape recorders. Recording: Select the signal source to be recorded using the selector switch (DISC, TUNER, CD or VIDEO). Then set the correct recording levels on your tape recorder and switch it into "RECORD” mode. During recording the volume and tone controls have no effect on...
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