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Sound equipment

Page history last edited by David Samways 6 years, 1 month ago Saved with comment





Extracts from Marconi Catalogue......




The Company is specialising in modern system planning even to the most exacting customers' specification.  Marconi consultants, project engineers, architects, and acousticians are always at the service of clients during all early stages of their organisation.  Marconi engineers also deal efficiently with the whole aspects of installation, staff training, and initial traffic of the service.


No two organisations use identical methods of operation.  The widely differing function and usage that has evolved has prompted the Company to the first developments of custom-built sound equipment.  The Company's 'tailor-made' apparatus, accessories, studio suites, reporting and recording vehicles and whole broadcasting-house schemes have become a well-established branch of its business and have earned a fine engineering tradition second to none.




The past few years have shown a great increase in the demands made on sound equipment, both in broadcasting and in television.  Not only have the number of control channels increased but far more complex and flexible auxiliary facilities have been required for studio and outside-broadcast work.


We therefore provide a range of sound equipment which will meet these demands without losing sight of the more modest, but equally important, requirements of the small studio operator.


There has been an increase too in the number of outside broadcasting vehicles equipped by the Company for sound broadcasting authorities.  Our experience with sound, to day nothing of television, radar and military communication vehicles enables us to bring expert knowledge to bear on the many problems of broadcasting and recording vehicle design and equipment.




"Over the past years there has been a great increase in the demands made on sound equipment, both in broadcasting and in television.  Not only have the number of control channels increased but far more complex and flexible auxiliary facilities have been required for both studio and outside-broadcast work".


"We therefore provide a range of sound equipment which will meet these demands without losing sight of the more modest, but equally important, requirements of the small studio operator".




Broadcasting Division's range of sound equipment has changed considerably during the past few years and even the most modest operator can find a performant solution to meet his particular requirements.


The following two items exemplify the wide range of equipment available:


  • Small, elegantly styled transistor peak-performance meters and volume meters
  • 12-channel Mixer type B1103 is a very competitive sound mixer offering all the facilities required for television broadcasting



Sound Equipment


Model number 



Date (approx.)

BD970  Transistorised Sound Console    1962 here 
B1005  Transistor Sound Console    < 1965 here
B1102  Transistor OB Mixer with B1701 Monitor    < 1965 here
B1103  Sound Mixer    < 1965 here
B1005 Transistor Sound Consoles   c. 1969







B1103*  Sound Mixer for Television   c. 1969
B1333  Universal Sound Amplifier   1966
B1334 Sound Distribution Amplifier   < 1968
B1336  Dual Loudspeaker Amplifier    c. 1969
B1750 Series Programme Meters (VU and PP)    < 1968


*  Article available on the B1103 Sound Mixer is available here



Sound control desks


Model number 



Date (approx.)

BD646  Mobile Commentators Communications units    c. 1952





BD647  Moble Production Console    c. 1952
BD648  Mobile Engineering Console    c. 1952
BD536  Sound Control Desk  8 channel  c. 1952 here 
  Mobile Sound units    1961 here 
BD521  Continuity Control Desk    1952 here


Television sound control desk "Major"

35 channel

1961 - 1964







Television sound control desk "Medium"

27 channel

1961 - 1964


Television sound control desk "Minor"

13 channel

1961 - 1964

BD554 Portable Amplifier and Mixer 4 channel < 1958 here 
BD580 Mobile Sound Control equipment, includes: 5 channel < 1958 here




Mobile Amplifier unit

Mobile Power Supply unit

Control Panel 

BD582 Studio Sound Control equipment 7 channel < 1958 here 
  Broadcasting Studio Control    < 1960 here 
BD956  Outside Broadcast Transistorised Mixer    1960 here 
BD956B  Outside Broadcast Mixer with Monitor 1701  Note 1  1963 here 
BD972  Sound Mixer  Note 2  c. 1964 here
  Transistorised Sound Consoles    1960 here
BD545  Studio Control Console    1952 here 
BD545 and BD595  Studio Control Console    < 1963 here


Note 1

The BD956B Mixer with associated 1701 Loudspeaker Monitor are primarily designed for outside broadcast use offering four low-level inputs for microphones or transcription heads.  Both units can operate off a variety of standard mains voltages and 12 volt batteries.


Note 2

The BD972 Sound Mixer has been designed for television outside broadcast units and small television studios.  It is fully transistorised and can easily be mounted in a customer's control desk.



Television sound control desk "Minor" as installed in the Intertel OB van.





Module System of Sound Control units


These modules comprise:


  • Channel / Echo Amplifier
  • Channel Splitter Amplifier
  • Group Splitter Amplifier
  • Booster Amplifier
  • Programme Amplifier
  • Single-Input Isolation Amplifier
  • High-level Unit
  • Triple-input High-level Unit


Each module is an assembly in the shape of a book which can be built into a studio console or desk.


1962 information click here

1963 information click here

1964 information click here



Programme Meters (V.U. and P.P)


There are two types of Programme Meter:  


  1. Volume Unit (VU) meter, or Standard Volume Indicator (SVI), which displays a representation of the signal level 
  2. Peak Programme (PU) meter which shows the peak level of the waveform no matter how brief its duration


The following units make up the range of programme meters:


Model number Description  Comments  Date (approx.)  Details 
  Programme Meters    1961 here 
BD529  V.U. Meter    1964





6289  V.U. Meter    1964
6288  P.P. Meter    1964
BD520E  P.P. Meter    1964
7188  P.P. Meter    1964
  Programme Meters    1965 here
  Programme Meters    1966 here



Audio Amplifiers and Programme Input equipment


The following list indicated the wide-range of amplifiers which could be configured to meet the exacting requirements of any customer.  Most units mount in standard 19" racks.


Model number Description Date (approx.)  Details 
BD517  Microphone Amplifier  c. 1952



BD522  Trap Valve Amplifier  c. 1952
BD528  Line Amplifier  c. 1952
  Programme Input equipment - 1952 1952 here
  Programme Input equipment - 1958 < 1958 here
  Programme Lines and Input equipment - 1960 1960 here 
  Programme Input equipment - 1963  < 1963 here
  Audio Amplifiers  < 1963 here
  Audio Amplifiers and Programme Input equipment  < 1964 here
  Audio Amplifiers and Programme Input equipment  < 1965 here
B1333  Universal Sound Amplifier  1966 here




Sound Distribution Amplifiers


Model number


Description  Comments  Date (approx.)  Details 
BD967  Sound Distribution Amplifier    c. 1964 here 
B1309 Sound Distribution Amplifier    < 1965 here
B1337  Sound Amplifier    c. 1980 here 





From long experience of many types Marconi singled out several excellent microphones designed to suit all applications.


Model number  Description  Date (approx.)  Details 
BD506  Ribbon microphone  1952



  Microphone stands  1952
BD512  Commentator's microphone  1952
  Microphones  1961 here 
4021  Moving coil, general purpose  c. 1964







4032  Moving coil, outside broadcast  c. 1964
4033A  Cardioid, orchestral  c. 1964
4035  Moving coil, wide-angle  c. 1964
4037  Moving coil, stick  c. 1964
4038  Ribbon, orchestral  c. 1964
4104  Lip  c. 1964
4105 Small, directional c. 1964
LFV / 39 Moving coil, talk-back c. 1964
  Microphones  < 1965 here
  Microphones  < 1966 here
  Microphones  < 1968 here





Marconi supplied a comprehensive sewries of loudspeakers which covered the whole range of sound broadcasting studio, concert-hall or small-room reproduction applications including stereophony.  All models are designed and manufactured for Marconi by specialised manufacturers.


Model number  Description  Date (approx.)  Details 
BD516  6-watt loudspeaker amplifier  1952



BD513  20-watt loudspeaker amplifier  1952
BD504 Concert Hall loudspeaker Loudspeaker Monitor  1952




BD525  Table loudspeaker  1952
BD526  Floor mounted loudspeaker  1952
BD527  Portable loudspeaker monitor  1952
    BD510      Portable Amplifier and Mixer for BD527 c. 1952 here
  Loudspeakers for studio use  c. 1964 here
  Loudspeakers for studio use  c. 1965 here
  Loudspeakers for studio use  < 1966 here
  Loudspeakers for studio use  < 1968 here



Studio Signal Light systems


For further information:


1964 click here 

1965 click here

1966 click here

1968 click here






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