A new range of transportable radios – the Beolit – was launched in 1970. The sound reproduction was unusually good – so good that many of the Beolits are still in use. In principle, the units were battery-powered, but the 600 version could also be connected to the mains. An amusing detail was the indication, of the selected station. This was shown by a small metal ball which moved behind a glass cover in parallel with a magnet on the exterior control slide and was thus encased and protected. Despite its sophisticated exterior, the Beolit was extremely robust.
Beolit 400 was a basic FM-only portable radio, in much the same way as its replacement, Beolit 505. The case was partly aluminium, partly coloured plastic, which formed the front and rear panels. Bright colours such as red, yellow, green and purple were offered, along with black. As the panels were only clipped on and did not form part of the chassis, they could be replaced with different coloured ones at a later date.
The design allowed the set to be used vertically or horizontally, supported by its handle. Even though there was only one loudspeaker, there were grilles on both sides of the radio, so that sound was distributed evenly from both directions. The sliding dial on the top of the radio was similar to that offered on Beomaster 901. A transparent plastic pointer, like that of a slide rule, was slid across the top in order to adjust the tuning, little wheels fitted to the side could be used for accurate setting. Little markers could be set, whose projecting tops slightly blocked the pointer on its way past, providing a reference to frequently-used stations.
A powerful AFC system, which could be turned off during tuning, was also included. The amplifier could provide 3 watts of output, unusually high for such a small set. Sockets for an external 7.5V power supply (via Beopower 600) and a tape recorder were fitted.
The Bang & Olufsen Beolit 400 transistor radio, designed by Jacob Jensen was presented with the IF Award in 1971 and the ID AWARD the year before. In 1972 the Museum of Modern Art in New York (MoMA) chose seven Bang & Olufsen products designed by Jacob Jensen to be included in their Design Collection as representing excellent examples of the Museum’s criteria for quality and historical importance; design, in fact, which had influenced the twentieth century. Beolit 400 was were one of those seven products.
The first Master Control Panel and the first two way remote made by Bang & Olufsen, the MCP 7700 was designed to be used with the Beocenter 7700.
It can now be seen as the precursor to the Beosystem 5000 family though it was not as sophisticated as its descendants. It also had a back lit LCD display rather than the LED display used in the MCP 5000.
The final incarnation of the MCP style, this was a re-badged 5500 with no new features.
As with all the MCP panels, the LED display was greedy for power, and the D batteries did not last long if used regularly. The replacement, the Beolink 7000, made the move to rechargeable batteries as well as a far more advanced specification.
The main remote control for the Beosystem 5000, the MCP 5000 allowed full control of your Beosystem from your armchair.
Two way control allowed the status of the system to be ascertained easily and complex timer programming was possible using the controls under the flip down panel.
The MCP 5000 could only be used with the Beomaster 5000 and could be part of a multi-room system allowing full control in a link room. MCP5000 will not operate any of the other systems such as the Beosystem 5500, 6500 and 7000.
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.
As part of Beosystem 5500, this advanced tape recorder was as close to professional standard as could be made at the time, bristling with features you just loved to use!
There was Auto Reverse, letting you play or record both sides of a cassette as one continuous tape. And automatic adjustment of sound levels avoided annoying volume changes from one recording to the next. Then there was Bang & Olufsen’s famous HX-Pro recording system which gave vastly superior sound quality on the higher frequencies, creating a richer, more detailed sound image.
Beocord 5500 automatically adjusted itself to match standard, chrome or metal tapes. You had the option of Dolby B or C during recording. During playback, the recorder automatically switched itself to the noise reduction system you recorded with. Automatic track search was also included – just key in the track number and the recorder did the rest.
The cassette recorder could be controlled via the two-way Master Control Panel 5500 as part of the Beosystem 5500.
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.
Beomaster 5500 was the brains and heart of the system which it made up.
Connected by Datalink to the record player, tape recorder and CD player it allowed the user to remote-control the whole system via the Master Control Panel. The 2 x 60 watt/8 ohm tuner/amplifier gave true hi-fi quality. Bang & Olufsen’s Automatic Power Handling Control system prevented overloading and distortion, regardless of how many speakers were connected. Up to 20 stations on the tuner could be preset and the frequency synthesizer took care of automatic search and fine tuning of stations. The result – superb reception of LW, MW and FM wavebands and impressive ease of use.
Beomaster 5500 was aesthetically balanced to match the rest of the components within Beosystem 5500
These days, these receivers are the cheapest of the Beolink 1000 controlled stackable systems. They do have the huge advantage of having not only DIN connectors but also a full complement of RCA plugs. This actually makes them ideal for present day use as the extra connections allow computer and digital music connections in addition to usual sources.
A thoroughgoing ‘black box’. Nothing in the shape of the device revealed how it worked or what it was. Only the inscription on the top of the unit told the user just how the black ‘magic mirror’ was brought to life so it could show which function has been activated. The unit was Bang & Olufsen’s first remote-controlled hi-fi system.
Beomaster 6000 History
Beomaster 6000 was the realisation of the Topline prototype on which work had progressed over the preceding years. The long flat cabinet of the Beomaster 1200 with its operation from the top and the depressed knobs was repeated. But the Beomaster 6000 is the first representative of a new phase in Jacob Jensen’s oeuvre. The slide rule motif symbolised mechanical precision, but now the entire idiom is adapted to the abstraction it was necessary to submit in communicating using electronics.
The visually, symbolically and tactilely easily understood slide rule operation belonged to the age of mechanisation and must be understood in extension of the modernistic machine aesthetics of the 1920s. The design of the Beomaster 6000 emphasises that it belongs to the electronic age and that it is part of the virtual, digital epoch. The volume is regulated stepwise by pressing one button to increase volume and another to reduce it. The buttons are gathered together in one large steel sheet, in which ‘tongues’ have been cut. These each have a play of less than half a millimetre as they are electronic micro-switches. The depressed adjustment knob, which made its first appearance in the General Electric radiogram study model around 1960, is an electronic tuner.
” The great quality of the slide rule motif was that it showed both the user’s input (setting) and the device’s output at the same time. The logical consequence of micro-electricity is a division of input and output – the electronics differ from mechanical operation in that their function is invisible. Jensen does what he can, nevertheless, to make it easy to understand what is happening. Input is placed in a silver-coloured control panel, while output (displays) is gathered under a sheet of dark glass. This magical black sheet, ‘the magic mirror’ that lights up while in use, is to give an extra experience over and above the purely aesthetical. The Beomaster 6000 is a very easy advanced quadraphonic radio. In view of the development team, four sound channels required your being able to adapt the sound to your position in the room. In this way, the first remote-controlled hi-fi system became a reality. ” – taken from ‘Jacob Jensen’ by Christain Holmsted Olesen.
Beomaster 6000 features
At the centre of the Beosystem 6000 was Beomaster 6000, a 4-channel amplifier with an FM tuner. Beomaster 6000 had a built-in SQ decoder (4-channel matrix) and was a full remote controlled system. Five FM stations could be pre-selected and there was manual tuning on the large illuminated FM scale. The FM tuner covered 87,5 – 104MHz. Tuning was carried out via feather-touch controls. The amplifier section was designed to cope with all sound reproduction systems: one, two or four channels. It produced 4×40 watts RMS (4 ohms) or 300 watts total music. 4-channel sound reproduction from records was popularly represented by two systems: CD4 discrete and SQ matrix.
CD4 (Compatible Discrete 4 channel) enabled high-quality sound reproduction with a high degree of separation between the four channels. CD4 was called at the time ‘TRUE 4 channel system’. However, many companies chose the SQ system because it was easily transmitted over FM and SQ records could be played on a high quality stereo record player. However, the price of convenience was less channel separation than the CD4 system afforded.
An SQ matrix decoder was incorporated in Beomaster 6000. Basically, its job was to reconstruct sound information for the two rear speakers. For CD4 records this reconstruction took place in the record-player, Beogram 6000.
Operation
Operation of Beomaster 6000 was child’s play. The large flat operation panel had logically grouped controls for all essential functions. Primary functions (e.g. programme source selection, volume, balance, bass and treble controls) were large, prominent, yet unobtrusive easy-touch buttons, while secondary functions (e.g. loudness, hi and low filters, etc) were smaller push buttons. Volume, balance, bass and treble controls were executed by a feather-touch of the finger tip. A servo-motor did the real work. An illuminated scale indicated position and control levels. There were facilities for frequency correction on all 4 channels. Each channel had a frequency range of 20-30,000 Hz. Distortion was lower than 0.1% at full power output.
Remote Control
The cordless (ultrasonic) remote control for the receiver could be bought as an accessory. This unit put you in true control of the music system. All the following functions could be controlled: volume, balance: left and right speakers; balance: front and rear speakers; five pre-selected FM stations; selection of external programme sources: record-player, tape/cassette-recorder; switching on and off (stand-by).
Connections
All necessary connection facilities were incorporated in Beomaster 6000: 4-channel record player, 2 or 4-channel tape-recorder. 4-channel headphones or two sets stereo headphones.
Beomaster 6000 was perfectly matched to partner the Beocord 5000 cassette recorder (introduced 1975). Beomaster 6000 was featured in an exhibition at New York’s MoMA (Museum of Modern Art) in 1975. At the time of its release it was the flagship of Bang & Olufsen’s hi-fi product range and was quite expensive to purchase. The UK price in 1978 was £581.50.
Accessories:
FM room aerial
An FM aerial type 8902010, was designed for use with Beomaster 6000 to be used in the home, within a certain radius of the radio transmitter. It was easily positioned at the rear of Beomaster 6000 and its two telescopic elements could be extended.
Design is a language which is understood by everyone…” as designer Jacob Jensen expressed it and demonstrated it in practice.”
A silicon-transistor high-fidelity amplifier with less than 0.6% distortion at all frequencies and at all volume levels up to 2 x 60 watts of power output. Its signal-to-noise ratio is better than 90dB (linear measurement). It has calibrated graphic controls and is extremely versatile, due to an unusual number of input and output facilities.
The Beolab 5000 is an amplifier that introduces no hiss or hum and reproduces all frequencies of the tonal range exactly as received. It has enormous power, permitting reproduction of even the loudest passages without distortion. Moreover, operation is logical and straightforward; varying or poor record quality can be compensated by means of efficient filters which remove the particular tonal range in which flaws are present; there is provision for connecting several speakers, including centre speaker, as well as provision for channelwise control of programme material. A special feature is a test control to facilitate adjustment of balance between channels. The use of silicon transistors ensures very low noise level, high temperature stability, and a very wide tonal range.” – taken from the 1967
Bang & Olufsen’s Beomaster 5000 FM tuner, BeoLab 5000 amplifier and Beovox 2500 Cube loudspeakers were the first product series designed by Jacob Jensen in 1967.
The traditional style for tuning knobs was replaced by an exact measuring instrument akin to the slide rule which was considered an innovation in changing the future of radios and amplifiers. The interface, in its precision and simplicity, proved to give the user optimal functionality. This solution had never been seen before and laid the foundation for the future form language of B&O. On this basis, Jacob Jensen was asked to design B&O´s audio programme. Beomaster 5000 was an FM tuner, with elimination of static between stations and a built in ‘data base’ which automatically tuned in on stereo broadcasts.
Partner to BeoLab 5000 was Beomaster 5000, an amplifier with the same slide rule interface.
The TV boom of the 1950’s hit the cinemas badly, which meant that the pressure on Bang & Olufsen’s sound engineers became less. The engineers’ love of high class sound reproduction, however, remained undiminished.
As early as the 1950s, they had developed stereo systems for the installation of Cinema-Scope systems in cinemas. In 1958, they were also responsible for the development of equipment for the first stereophonic radio transmissions from Denmark’s very first commercial radio station, Radio Mercur. When stereo started gaining ground, the engineers found new opportunities for a comeback.
The development of High Fidelity had already begun in the US and a number of small companies, headed by Scott and Fischer, had gained a dedicated following. By 1964, Bang & Olufsen was planning to conquer the new upcoming European Hi-fi market, a niche which ideally matched Bang & Olufsen’s survival strategy. Now engineers with more than 30 years’ experience behind them, under the leadership of chief engineer Nikolaj Krebs Sørensen, embarked on the development of the world’s most perfect hi-fi system, the BeoLab 5000 series.
With its ultra selective tuner and a powerful, distortion-free amplifier of no less than 2 x 60 watts, it offered qualities never seen before. The design was equally sensational. In the US, where the production of Hi-fi components had already started, they had found their form in the 19” rack format which was used by the first customers, the radio stations. When Hi-fi enthusiasts wanted quality tuners and amplifiers, they had to accept a design which belonged in the professional world.
Bang & Olufsen’s brief for the designers was: “Create a European Hi-fi format, which communicates power, precision and identity.”
This became designer Jacob Jensen and his assistant, David Lewis’ first assignment together for Bang & Olufsen. They solved it by designing the new linear controls like a slide rule bar in order to communicate the greatest possible precision. Thus began the era of the slide rule bar, a motif which was used and varied in the years to come.
The Hi-fi modules’ handles became countersunk Allen screws and the faceted and framed gold panels, which were the industry’s standard, were, in Bang & Olufsen’s design, transformed into extruded natural anodised aluminium.
BeoLab 5000 became a success, not only as Bang & Olufsen’s flagship, but also in more affordable versions, e.g.. Beomaster 1200 and 3000 and competitors were forced to follow suit. Elsewhere too, knobs were replaced by the linear slides – a development which continued until the mechanical grips were replaced by the electronic ‘easy touch’ controls of the Beomaster 1900.
At the 1967 spring fair in Hanover, B&O received the IF award for BeoLab 5000, Beomaster 5000 and Beovox 2500 Cube for outstanding and user friendly design.
