User manual TANDBERG TR-2075

[. . . ] Contents: Power ON/OFF switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Extra power sockets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Light dim. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . FM Antennas . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] The diagrams illustrate the five possibilities. Use of PRE AMP OUT and MAIN AMP IN sockets The four sockets on the extreme left of the back panel give access to the pre-amplifier outputs and the power amplifier inputs. The sockets are intended for connection of external networks such as equalizers, echo boxes, and reverberation units. For normal use the sockets must he strapped together with U links as shown in figure (a). When an external network is required between the PRE AMP output and the MAIN AMP input, remove the U links and connect according to figure (b). 2 volts at less than 0. 1% distortion and has a source impedance of approx. 1 k ohms. 10 Filters LOW FILT Rumble from a record player, acoustic feedback between speakers and a pick-up, or excessive bass resonance in a speaker or a room can all be controlled by means of the LOW FILT. The graph shows the effect of the control (-12 dB/octave). HIGH FILT 1 If the program is accompanied by strong hiss or scratch noise from old and worn records or noise from a tape recorder or from the receiver, depress the HIGH FILT 1 button to obtain moderate attenuation of the high frequencies. The graph shows the effect of the control (--12 dB/octave). HIGH FILT 2 Tins control can be used for the same purpose as the HIGH FILT 1 control, it simply gives less attenuation (--6 dB/octave) as may be seen in the graph. HIGH FILL 1 and HIGH FILT 2 Depressing both these buttons simultaneously gives the heaviest attenuation of all at the high frequencies as may be seen in the graph (-- 1 8 dB/ octave). LOUDNESS At low volume the ear is less sensitive to high and low tones. As a result music at low volume from speakers tends to lack high and low tones and sounds as if it has too much "body" in the middle tone range. To compensate for this effect, depress the LOUDNESS button whereby the bass and t re bl e will be boosted according to the setting of the VOLUME control. The graph shows how this boost increases as the volume is turned down. 11 Headphones Stereo headphones can he connected to the 3-pole jacks marked PHONES on the left side of the front panel and the program level can be adjusted by the VOLUME and BALANCE controls. Two people can listen at the same time if two sets of headphones are plugged in and you can avoid disturbing other people in the room by switching the knob SPEAKERS to OFF. Headphone listening is very convenient for monitoring when recordings are being made, particularly if microphones and loudspeakers are in the same room because it avoids "acoustic howling". They provide a more intimate listening experience and difficulties associated with room acoustics are avoided. But there are disadvantages, for example the whole sound environment turns with the listener when he moves his head, a feeling regarded by some people as unnatural. Headphones today are mainly the moving-coil type and are obtainable with impedances ranging from about 8 ohms up to about 2000 ohms. The impedance of the headphone jacks is 220 ohms and they will accept any headphones with any impedance above 4 ohms. However, some caution may be necessary when playing at high volumes, because some types of headphones may be damaged by excessive power. The curve on the right shows how maximum obtainable power varies with the headphone impedance. Headphones come in all shapes, sizes, and weights and are largely a matter of personal preference. When buying headphones it is wise to try them on and be aware that the heavy, close fitting type may cause fatigue when used for long periods. Occasionally the plug should be given a quick rub with a soft cloth and a very small amount of vaseline. 12 Loudspeakers Connections Connect speakers to the terminals marked LOUDSPEAKERS at the back of the receiver. [. . . ] If you want to control the tonal balance and the volume of the program to be recorded, depress the PREAMP REC. button on the front panel The speaker volume will be reduced to a suitable monitoring level (source test) and the volume, tone, balance, loudness, and filter controls will be active as shown in the diagram below. Although the source test can be carried out from the receiver, the tape test can only be carried out from the tape recorder itself. Therefore be careful not to release the button when playing at high volume. [. . . ]