Beocenter 7002 was one of the most advanced hi-fi music centres on the market at the time of its release. One touch gave you music instantly from a record, cassette tape or an AM or FM radio station.
Illuminated symbols on the set’s communication panel confirmed your instructions or rejected mistakes, and kept you informed of the set’s operational status at all times. In short, Beocenter 7002 offered two-way communication in high fidelity.
The cordless remote control module put you in command of all functions from your chosen listening position. Select any programme; this action also switched the set on. Regulate the volume level – there were 2 x 40 watts RMS at your disposal. Make cassette recordings. Or switch off the set – all without leaving your chair.
Comprehensive memory and timer facilities enabled you to programme the set’s microcomputer to operate any function at a given time within a 24-hour period. It could record an important radio programme while you were away from home. You could even instruct the Beocenter to wake you up with an early morning broadcast.
Each of the Beocenter 7002’s three sound sources had a high quality and performance level normally found only in much more expensive separate units.
The record deck had electronic Servo Drive for absolute speed accuracy and its operation was fully automated. Stop, start or pause by remote control. The cassette recorder had a Sendust record/replay head and a double-gap erase head that could even cope with metal tapes. You could locate any point on the tape simply by asking the set’s microcomputer to search for this required counter reading. The radio had facilities for pre-setting 5 FM and 1 AM stations which could then be selected instantly at the touch of a button.
Beocenter 7002 offered the same musical facilities and powerful 2 x 40 watts RMS output as Beocenter 5000. The two models were identical in the matter of sound quality too, but only the Beocenter 7002 had Bang & Olufsen’s very advanced timer-track location and remote control systems. The black anodised lid of its cassette compartment further differentiated Beocenter 5000 from the 7002.
Beocenter 3300 combined a powerful AM/FM stereo receiver with an automatic record player. Technically identical to the Beomaster 2200, the receiver section offered programmes on FM, long and medium wavebands and up to 2 x 40 watts RMS amplification with low distortion levels. It also had the same logical operation facilities.
The record player had a spring-suspended rotatory mechanism and an electronic servo drive system which ensured accurate turntable speed – even during variations in the mains current supplies. A special pendulum leaf spring suspension made the arm and platter immune to external shock and vibration which causes most other record players to mistrack and damage the record and sometimes even the stylus.
All functions of the record player were operated by touching a single button. The start/play/stop cycle is entirely automatic and moves, lifts or lowers the arm much more delicately than could the human hand. The MMC 20E cartridge carried an elliptical diamond stylus.
Beocenter 3300 had sockets for a tape deck, an extra record player, headphones and two sets of stereo speakers. The unit could be made up as part of the Beosystem 3300, when linked together with other compatible Bang & Olufsen products.
Beocord 1200 Type 4207 was a reel-to-reel tape recorder. Among its features it had sound-on-sound, automatic recording level control and mixing. The in-built PA amplifier could be operated without the motor running.
Beosystem 1200 – made up of Beomaster 1200, Beocord 1200 and Beogram 1200 was Bang & Olufsen’s B&O’s first designed system. The design ‘kinship’, which emphasised the interdependence between B&O’s various products, became a characteristic of B&O for many years. Beosystem 1200 was one of the first products selected by New York’s Museum of Modern Art for the museum’s permanent collection (not exhibition) in 1972.
In 1969 the Danish Society of Industrial Design awarded Bang & Olufsen and Jacob Jensen the ID prize for the Beomaster 1200 radio/amplifier, Beogram 1200 turntable and Beocord 1200 tape recorder for unusually beautiful and user friendly design. The jury emphasised in particular the Beomaster 1200 receiver which pointed in a new direction for the design of radios.
The 1200 series represented the logical continuation of the line of development and design which put B&O at the forefront of manufacturers of entertainment electronics.
Beocenter 4000 was an elegant combination of an AM/FM stereo receiver (in effect the Beomaster 2200) and a high quality cassette deck whose performance levels matched those of more expensive separate decks. The Sendust tape head ensured the best possible playback and combined long life with optimum frequency response characteristics. There were two motors – one for fast wind, the other for normal play – so tape transport was smooth and stable at all times. A Dolby B Noise Reduction circuit ensured high quality, low-noise recordings. Despite its many technical refinements and comprehensive facilities, Beocenter 4000 was simple to operate.
Beocenter 4000, in which all parameters concentrate on the quality of radio and tape reproduction, was an unusual alternative to a disc system. The addition of a matching Beogram from the Bang & Olufsen range, plus two Beovox S45 bookshelf or P45 wall-mounting speakers converted it into the complete top-quality Beosystem 4000.
Beocenter 4000 comprised a 2 x 40 watts RMS amplifier, an FM, Long and Medium wave radio and a stereo cassette deck incorporating all the features you would expect to find only in separate high quality decks.
Beocord 7000 was a high-quality cassette recorder used specifically with Beosystem 7000. When playing cassettes, the order of the tracks could also be changed and the recorder could also find a specific track on a tape. Other functions included Auto Reverse, Auto Record levels, Dolby B and C as well as Bang & Olufsen’s recording system HX-Pro, which ensured that the sensitive treble range is captured in recording.
Beocord 7000’s features were supplemented by an abundance of special features. Space available precludes a more full description of elements such as the design of the peak programme meter, locally operated functions such as microphone recording, memo set/go, adjustment of the maximum record level and so on.
Main features:
Auto record level
Auto track search/auto reverse
HX Pro
Auto Dolby B-C
Auto tape switch
All operation available from Beolink 7000, with full display readout of track bar, counter, record level, Dolby NR, auto reverse functions, sequence programming etc.
Recording with Beosystem 7000 was a system feature, with benefits such as automatic signal routing, record lock, etc. Beocord 7000 contributed a lot to the convenience of the system and the unique auto record level was the feature that made remote controlled recording a real possibility – without compromising the quality of the recording. To further ensure a high and consistent sound quality level Beocord 7000 was equipped with HX Pro.
Auto record level
Auto record level is a unique Bang & Olufsen feature and ensures a uniform and optimal recording level from all sources, from tape to tape, without overload. Major benefits of auto record level are:
all tapes recorded with auto record level have the same optimum level, without overload and therefore without distortion
a recording can be started immediately and directly, without any pre-adjustments
you do not have to supervise a recording to adjust record level and the system recording even stops the recording when the source runs out, or stops the source when the tape runs out
if auto record level interferes and adjusts the recording it is done in such a way that it is not noticeable in playback. The dynamic range of the recording will not be impaired and the adjustments are carried out so early that overload is precluded.
The assets of auto record level are obvious when a comparison is made between those carried out on a standard recorder without auto record level and those with.
Recording on a standard recorder requires you to supervise the recording in order to step in if the manually set input level is too high. In this case you would have to adjust the record level down when a signal with a high dynamic content is to be recorded. If this is not carried out the tape will be overloaded and the music distorted. Without auto record level, copying is in real-time, which means that you will have to pay attention all the time you are recording (or risk a distorted recording). And when a very wide dynamic signal threatens to overload the tape being recorded, the record level must be lowered quickly, which will often be audible in subsequent playback, either as a suddenly lowered output volume or as a distorted signal because the record level was lowered too late.
Auto record level is an efficient remedy to this problem, without both disadvantages mentioned above. Primitive solutions reduce the record level when powerful signals are recorded and increase the record level when weak or no signals are recorded. The result can be a fluctuating dynamic range with, for example, pauses between tracks causing the recording level to rise dramatically and the noise level with it.
The Bang & Olufsen solution
The auto record level in Beocord 7000 was monitored by the microcomputer interacting with the peak programme meter indicator on the front of the cassette deck. Auto Record Level only reduces the record level and only if the signals exceed the set value for a certain period. In this way brief noise pulses, such as the ones resulting from scratches on a record, do not lower the record level. When a signal of more than +2 dB above the set value is encountered, the microcomputer lowers the record level with 2 dB. The recording continues at the lowered level unless even louder signals appear and trigger new reductions.
Other advantages of auto record level are:
it is applied to all sources, even if you record sound from a video source
the preset values can be changed, e.g. if you use special tape formulas
auto record level can be overridden while you are recording, or you can make a recording with manual adjustment of the record level
You did not have to pre-adjust Beocord 7000 before you started a recording. Another feature was the auto tape switch, i.e. an automatic adjustment to the three tape types, metal, chrome and ferro, by means of three electronic sensors located in the cassette holder. Auto-reverse was the default mode both in recording and playback, i.e. Beocord 7000 automatically continued the recording (and playback) on side two, when side one ran out. The turning time from side one to two was very short, because an optic sensor registered the lead-in tape and executed the 180 degree turning of the tape head immediately. Auto reverse could be cut out manually to protect side two from being recorded. This had to be done prior to record start.
Track Search
Beocord 7000 featured track search, based on pauses between individual tracks. You could also make a sequence programming, operated just like CD. Track search was available no matter if the track was on side one or two of the tape. Even if you executed a manual TURN function (i.e. change playback direction) the microcomputer registered the turning point and if you selected a track after the turning point the search for this track would be initiated at the turning point. Track numbers could be displayed on Beolink 7000.
Auto Dolby
Another convenience was the Auto Dolby function. All tapes recorded on a Beocord 7000 contained inaudible information as to whether the tape was recorded with Dolby B, Dolby C or no Dolby noise reduction. The registration of noise reduction type was dynamic and in case the circuit registered a change during playback the reduction was automatically changed. If no signal was registered, e.g. on a pre-recorded tape, the noise reduction last selected would remain active, until altered manually (see more below).
HX-Pro
Beocord 7000 was equipped with HX Pro, like all other ‘stackable’ Bang & Olufsen audio tape recorders. HX Pro is an acronym for Headroom Extension Professional and tapes recorded with HX Pro give a better reproduction quality on playback, no matter which tape deck they are played on. Both the dynamics and the the signal capability in the treble range is improved. The improvements are most noticeable in the reproduction of treble signals, but also the midrange will be influenced in a positive way. At 10KHz the signal loading capability is improved by approximately 8dB for chrome tape, 5dB for ferro tape and 3dB for metal tape formulas.
Beocord 7000 could ideally be used as part of Beosystem 7000.
A light touch to the front of the Beocord 6500 cassette recorder released the loader which glided out slowly and silently in order to allow you to insert a cassette. You could use whichever type of cassette you prefer; or choose between Dolby B or C Noise Reduction systems… and rejoice in Bang & Olufsen’s patented HX-PRO recording system which ensured optimal sound reproduction, particularly in the difficult, high-frequency range. And, naturally, Beocord 6500 had auto-reverse so that both sides of the tape played as one.
Beocord 6500 could be used as part of the Beosystem 6500 hi-fi system.
Auto Record level
One of the less-pleasant chores in making a recording is setting level control to its optimum position. Setting it too low raises the level of background noise on the recording. Setting it too high makes the recording distorted at high music levels. With this in mind, Bang and Olufsen introduced an automatic record mode which was called ‘Auto Record’.
Auto Record worked in two steps: when the record button was pressed for the first time, the cassette recorder went into a record pause mode, where the incoming signal was monitored. Under microprocessor control, the highest level was monitored and the record level was set at the optimum level for that music. On pressing the record button the second time, the tape was set in motion and the recording started, but continuing to make minor adjustments. If at any time during the recording, the level of music rose above the monitored level, the level control was lowered by exactly the amount required for the new optimum recording level.
This method of setting the level control closely imitated the action of a highly skilled recording engineer, if asked to set the level for a recording. It was the best that could be done when the full recording could not be monitored before recording started.
This feature incorporated a new method of monitoring the signal, which proved to be a more effective method over conventional methods. It was patented by the company with the patent number 158702.
The Beolab 11 is the new lower priced subwoofer, designed in particular to accompany the Beovision 10. It utilises a design principle seen in other subwoofers of having identical units firing in opposite directions and hence making the structure more stable. Indeed the B&W PV1 does just this using B&O ICE amplification.
B&O however have added a new twist to the equation by having the two 130mm drive units firing inwardly and so allowing the external casing to be made from the same polished aluminium seen in the Beovision 10.
Amplification is via a 250W ICE unit and so the speaker can be seen to fit below the Beolab 2 in the range.
Mounting Options
As a result of the balanced drive units, the Beolab 11 will be offered both as a floor standing model and with a wall bracket. This is again designed to match the Beovision 10. The Beovision 10 in both 40″ and 46″ versions is designed so that it can be used as a stand alone set but still utilise the subwoofer output.
This should add the lower frequencies not able to be produced due to the small speaker enclosure of the Beovision 10.
The Beolab 11 will stand just 320mm high on the floor stand. The cross over frequency and bass lift is set with a collection of switches on the base. There is a Powerlink connection and two Powerlink outputs so it can be used in a stereo system.
Beogram CD 7000 was distinctive because of its authentic sound reproduction as well as its large dynamic range. It was equally suitable for symphonic music and rock. Its many functions allowed you to pre-programme tracks for playback in any desired order. This CD player was the last in line as far as separates were concerned, replaced with the likes of Beocenter 2300 and Beocenter 2500.
Features:
Exclusive computer-controlled CD loading mechanism with extremely fast access time
CD tray machined from a 4mm solid aluminium plate for maximum mechanical stability and convenient loading
Disc tray cut-outs with rubber lining for 12 and 8cm discs
Spring-suspended CD mechanism and magnetic disc clamp
Special functions, such as scan and sequence programming, were carried out from Beolink 7000
Dynamic readout on Beolink 7000 of all functions, track bar, remaining time, elapsed time, scan, etc.
CD players are now among the simplest constructions in the electronic world and standard players are based on very few components, a simple electronic layout and use of economical materials, both inside the product and in the cabinet. In the construction of CD7000 the main objectives were the achievement of excellent mechanical stability, convincing sonic qualities and easy access to the CD functions.
The loading mechanism, the way the clamp function and the suspension of the CD mechanism were all points that received special attention. The high quality of the mechanical solutions was continued in the electronic circuitry and both were highly integrated and interdependent of each other.
The CD tray was very solid and elegant and the loading mechanism extremely durable. The tray was made from a 4mm thick sheet of aluminium and the conical recess for the CD was milled and diamond polished to the smallest of tolerances – to prevent dust gathering in the recess. The circular rubber profile protected the disc during loading and unloading, while the triangular cut-out facilitated unloading. To avoid static build-up the tray was connected to ground and to avoid ‘ringing’, a damping plate was placed at the innermost part of the tray, inside the cabinet.
The motorised movement of the CD tray was very fast and gentle. The movement was controlled by the microcomputer via an optocoupler and was a very stable mechanical solution with two parallel chrome plated brass rail tubes and precision plastic roller bearings. A nylon coated steel cord wire was applied for maximum duration and quiet transport. The electronically governed transport was very smooth, started the movement slowly, then speeded up very quickly, decelerating when the disc approached the clamp. Furthermore, it secured against possible damage occurring from obstacles either in front of the tray or in between tray and cabinet.
While the tray approached the clamp the disc was gently lifted off the tray and clamped between the CD mechanism and magnet. The magnet was placed on a bridge across the CD mechanism and when it engaged the disc the magnet was lifted away from the bridge. While the disc was rotating, the magnet was not in contact with the cabinet, but only the disc and CD mechanism.
This assembly was insulated very efficiently from the cabinet to prevent vibrations from the outside. A special suspension was designed, with 4 steel springs, encased in rubber. The springs ensured that the CD mechanism was fixed in the horizontal plane (i.e. across the disc), while a certain amount of movement was allowed in the vertical plane (i.e. up and down). Test showed that the servo system counteracts movements in the vertical plane better than in the horizontal plane, and the suspension thus was a good compromise with regard to immunity from external vibrations. The inherent frequency of the suspension was placed at 25 Hz to avoid tracking and focusing errors, which were prone to emerge if the CD mechanism was subjected to vibrations around 100 Hz and upward. Furthermore, at this frequency interference with the inherent frequency of the CD cabinet was also avoided.
The electronics
The CD format is one of the most precisely defined audio formats, but it is still possible to design differentiated products. The electronic solutions in CD 7000 were just as elaborate, the computer controlled loading just being one of the elements. Separate power supplies were available for the digital and analogue parts, and in connection with a careful print layout Bang & Olufsen achieved the most respectable electronic specifications. The digital-to-analogue filtering was special as well. First, a standard digital filtering (4 x oversampling) was applied to filter away the sidebands below 176,4 kHz. The analogue filtering at 176,4 kHz was carried out by a modified order filter. To avoid remnants of the 176,4kHz sideband having an effect on the filtering, a special suction circuit cut off the frequencies above 156,4 kHz. The modified filter was known as a ‘Bessel elliptical filter’. It had a very gentle filter characteristic and was not susceptible to ripple phenomena, phase distortion or ageing.
The functions
As with the other sources, operation was via the Beolink 7000, with full display readout of all functions. Special functions available included: the space function, where a pause of 4 seconds was added between tracks to facilitate track search on a tape recorded from CD 7000. Scan gave playback of the first 15 seconds of each track and was especially useful in connection with a sequence programming.
While you were scanning the CD, tracks could either be selected (compiled) or omitted and when the last track had been scanned, playback of the programmed sequence commenced. Sequence programming could also be carried out independently of the scan function and if you used the select programming, playback could be non-chronological. If you used the reject programming to leave out specific tracks, playback would be chronological.
Beogram 7000 could, ideally, be used as part of Beosystem 7000
If you wanted to indulge yourself with the finest sound quality then you’d do no better than listening to your favourite pieces of music on Bang & Olufsen’s Beogram CD 6500. Beogram CD 6500 was a replacement for its predecessor, Beogram CD 5500.
It played both 12cm and 8cm compact discs, and housed sophisticated and advanced digital technology. And it offered sound reproduction which would satisfy even the most demanding of listeners.
Beogram CD 6500 could be used as part of the Beosystem 6500 hi-fi system.
The quality of the Beogram CD 5500 CD player took time to fully appreciate. For example, the elegant disc tray with its completely smooth and silent drive. Or the way that the disc drive system was mounted to isolate it from vibrations. Perhaps you were most impressed by the way that a built-in circuit in the player compensated for the tiniest faults on the disc itself (contrary to popular belief they’re not always perfect!). Finding tracks was both fast and easy – it was necessary to just ask the Master Control Panel for the track number you wanted. You could programme tracks to be played in any order, or sample each track briefly. There was a light display which showed you the length of the track you were playing and the remaining time on the disc – invaluable for recording.
Though very similar to look at to Beogram CD 50, this all-new Philips-based machine was a radical departure, both in manufacturing and technical terms. Beogram CD 5500 was the first CD player to be entirely designed by Bang & Olufsen and with the exception of the optical deck, it was entirely made by the company too. The performance and reliability of the Beogram CDX models probably influenced the choice of the Philips radial single beam pickup system and brushless DC spindle motor.
Externally, a slim aluminium plate machined out to the size of a compact disc replaced the Beogram CD 50 door and drawer loading system and it moved quickly and silently, again in marked contrast to its predecessor. The deck was on the right-hand side side of the fascia as opposed to Beogram CD 50 left-hand side arrangement, so that the loading of a cassette into the new Beocord 5500 tape recorder, which you had the option of placing below, was not obstructed. Later versions had a concentric 8cm circular recess machined into the loading plate, to accept CD singles.
With the Beogram CD 5500 there was no infra-red sensor option, and the front panel controls were even more basic, so at very least a Beomaster 5500 and Beolink 1000 terminal were needed to use it properly. On the back panel, there was a 7-pin Datalink socket for Beomaster 5500, and a single phono digital output connection, for which there was never a use within the B&O range.
The performance of this outstanding machine was never bettered, and with the exception of minor styling and software revisions, it remained virtually unchanged until the end of the separates system range with the Beogram CD 7000.
Beogram CD 5500 could be controlled via the two-way Master Control Panel MCP 5500 as part of Beosystem 5500.
