Contents: Power ON/OFF switch .................................................................................................. Extra power sockets ........................................................................................................ Light dim........................................................................................................................... FM Antennas ..................................................................................................................... Tuning on FM.................................................................................................................... AM Antennas..................................................................................................................... Grounding ....................................................................................................................... Tuning on AM ................................................................................................................... Volume - Balance .......................................................................................................... Tone Controls.................................................................................................................... Stereo - mono switching..................................................................................................... Use of PRE AMP OUT and MAIN AMP IN sockets.......................................................... Filters ................................................................................................................................ Headphones . ..................................................................................................................... Loudspeakers .................................................................................................................. Room acoustics ............................................................................................................... Stereo tips ....................................................................................................................... Speaker selector .............................................................................................................. Output power indicator ................................................................................................... Listening to records ............................................................................................................ Playback from tape recorders (TAPE 1 and TAPE 2) ....................................................... Recording from the receiver................................................................................................ Recording from a transcription unit..................................................................................... Copying tape ................................................................................................................... Recording on a third tape recorder with or without audio controls...................................... Monitoring during recording ........................................................................................... 4 Channel use ................................................................................................................. Simultaneous recording of a radio/transcription program and playback of another program from tape ............................................................................................ Plugs.................................................................................................................................. Useful data......................................................................................................................... Page 3 Page 3 Page 3 Page 4 Page 6 Page 8 Page 8 Page 9 Page 9 Page 9 Page 10 Page 10 Page 11 Page 12 Page 13 Page 14 Page 14 Page 15 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 22 Page 23 Page 24 Page 24 2 Power ON/OFF switch Make sure that the receiver is marked with the correct a.c. voltage for your supply. Switch the receiver on by depressing the ON/OFF-button. Another push on the button will release it and switch the receiver off. This button also controls the power to one of the extra power socket, marked SWITCHED, at the hack of the receiver (more details below). NOTE! When switching on you will notice that nothing happens until about 3 seconds after you have pushed the ON/OFF button. Then you will hear a click from inside the cabinet and the receiver becomes live smoothly without audible switching transients in the speakers. Extra power sockets Three extra power sockets are provided at the back of this receiver. These extra sockets are intended for other Hi-Fi units and reduce the number of untidy power cables. Two of the sockets by-pass the ON/OFF-buturn and are live as soon as the receiver power plug is live. These sockets are marked UNSWITCHED and the total combined power drawn from them must not exceed 200 W. These sockets are useful for connecting Hi-Fi units having their own power ON/OFF switches. The third extra power socket is marked SWITCHED and is controlled by the ON/OFF switch on the receiver. This socket is suitable for a Hi-Fi unit that does not have its own ON/OFF power switch and the total power drawn from it must not exceed 100 W. Check the power consumption of the units you connect to these extra sockets to ensure that it falls within the permissible total rating. NOTE! When using a switched wall socket remember to release the ON/OFF-button on the receiver before breaking the power with the switched wall socket. Otherwise you will hear a loud click in the speakers when switching on. Light dim If the scale and meter l i g ht s are too bright, depress the LIGHT DIM button on the extreme right side of the receiver. Another push on this button will restore the l i ght s to full brightness. 3 3 FM Antennas What type of antenna do you need? Your need for a good antenna will depend on the receiving conditions where you live; the further you are away from the transmitter and the more obstacles (hills and tall buildings for example) between you and the transmitter, the greater will he your need for a good antenna. Remember that it is not good enough just to receive a signal, especially if you are a serious stereo listener. You need to receive a signal that is much stronger than any unwanted electrical noise that might be lurking around in your area. Furthermore, FM signals bounce off large obstacles and cause you to receive the same program from several directions at the same time, possibly out of phase with one another. This gives distortion which you do not want. Instead you need one strong, clear signal straight from the transmitter and this may call for an elaborate, directional antenna. If in doubt you can consult your dealer who will probably be more familiar with local receiving conditions than most people. In any event you should install an antenna that is better than the one that you think you can just manage with, because under doubtful conditions a good antenna is just as important as good loudspeakers. Whether you need a simple antenna such as a folded dipole or an elaborate multi-element array, the following tips will be useful. Antenna connections This receiver is equipped with a balanced antenna input and an unbalanced antenna input. The 300 ohm balanced input terminals (socket on European version) are intended for connection to a 300 ohm antenna via a flat twin-lead balanced feeder having the same impedance. The 75 ohm unbalanced input terminals (socket on European version) are intended for connection to an antenna via a 75 ohm coaxial cable. The center conductor of the cable should be connected to the terminal marked 75 ohms and the shield should be connected to the chassis terminal just below. If you have the European version you should fit the appropriate plug. 4 A simple folded dipole antenna A simple folded dipole for connection to the balanced input can be easily made from flat twin-lead with an impedance of 240 to 300 ohms, A 135 cm (53") piece of antenna lead should be used for the loop. Strip off approximately 1 cm (1/2'') of insulation at each end and solder as shown. Cut one of the wires in the middle of the loop and connect another twin-lead to act as feeder to the input. Solder as shown. This antenna can be used indoors or outdoors. When used outdoors the solder joints should be protected against the weather and the loop can be f i x e d to a flat wooden board. When used indoors the loop can be fixed to any convenient non-metalic structure or a flat wooden board. The important requirement in all cases is that the loop should be firmly fixed, horizontal, and straight. To obtain good reception the loop should be approximately at right angles to the transmitter (see diagram) although the best orientation may have to be found experimentally. Typical multi-element antenna The diagram shows a typical multi-element antenna for use where receiving conditions are doubtful. This type of antenna will provide typi-cally 6 dB more gain compared with a folded di po l e (the antenna signal fed to the receiver is doubled). Many types of multi-element arrays are available and some can even be rotated every time you tune in to a different s t at i o n . Your dealer will ad vi se you or you can buy specialist literature and become an expert yourself. 5 Tuning on FM Select FM reception by depressing the FM button. The red light over the button will light telling you that the receiver is in the FM mode. Use the large knob on the right side of the scale to tune in the required station. NOTE! Make sure that the PREAMP REC button is released. Correct tuning is important, particularly for stereo, if distortion is to be avoided. This receiver is there-fore equipped with two tuning meters, one indicating signal strength (SIGNAL) and the other indicating midscale for exact tuning (TUNING). First adjust the tuning knob for maximum deflection on the SIGNAL meter and then make a final fine adjustment to obtain midscale deflection on the TUNING meter. The frequency calibration of the scale is accurate to within ± 200 kHz. So do not be confused if a station transmitting on, for instance, 103.9 MHz tunes in at 104.1 MHz on the scale. This is still within the tolerance. The scale is simply a guide and what really matters is that you use the two tuning meters correctly. Muting The high amplification necessary to obtain good sensitivity and limiting in high class tuners, makes tuning noisy. To avoid this, a muting circuit blocks the receiver automatically when no signal is received or if the signal is to weak to give satisfactory noise suppression. To receive a station that is not strong enough to cancel the blocking effect of the muting circuit, the circuit can be switched off. The muting function is activated by depressing the FM muting knob on the extreme right side of the front panel. Another push on the button will release it and cancel the muting. 6 Stereo/mono This receiver is fully equipped for the reception of FM stereo broadcasts. FM stereo broadcasting is based on the pilot tone system which allows the program to be received in mono on mono receivers without impairment of program quality. It is an inherent property of this system that a stronger signal is needed in stereo to obtain the same noise suppression as in mono. The FM stereo decoder automatically switches to stereo operation when a stereo signal of sufficient strength is received. If the stereo signal falls below a preset threshold, the program will be automatically reproduced in mono. However, it is possible for the strength of a stereo signal to be adequate and yet for the signal to be temporarily disturbed by noise or distortion. In this event depress the FM MONO button whereby the program will be reproduced in mono without noise or distortion. Because stereo reception requires a strong antenna signal and is sensitive to multi-path distortion, a good antenna is needed particularly under difficult receiving conditions and in fringe areas. Read the preceding section on FM antennas. Dolby* programs from FM stations The Dolby B noise reduction system offers a po ssi bi l i t y to combat the higher noise in FM stereo transmissions. The system is in the USA approved by FCC** for FM broadcasting. The Dolby B system use a program level dependent preemphasis. At high level the preemphasis is 25 sec, at lower level the preemphasis increases. The utilization of the allowed modulation can thereby be improved. The compatibility of the Dolby B system with existing standards is considered acceptable as the average preemphasis obtained in the Dolby B encoder matches the standard deemphasis. To take full advantage of the Dolby B noise reduction, a Dolby B decoder unit must be used ...