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Recollections of BBC engineering from 1922 to 1997
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Designs Department Manufacturing Information

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Designs Department Manufacturing Information (DDMI) was produced for every item of equipment that was designed in the Department. This enabled Equipment Department or external companies to make quantities of the item. Prior to about 1970 these documents were called Specifications.

DDMI samples may be viewed by clicking on the links below.  Additions to the list will appear from time to time, but it will remain very far from comprehensive.

A typical DDMI contained a description, test procedure, parts list, circuit diagram and assembly drawings (including printed circuit board, metalwork etc.).  All of the papers were contained in an A4 cardboard folder that was typically 1.5 cm thick.  The paper sizes ranged from A4 to A1.  This makes them difficult to scan, but I have found that an iPad scanner App provides a reasonable solution.  The resulting PDF files are far from perfect, but they are good enough to record the information for general interest.  In general, the PDF files linked below will only contain samples from within DDMIs e.g. not all of the parts list or assembly information.  

They are listed in equipment code order.  The number next to the code indicates the source and date.  e.g. 8.202 (65) means that it was designed by Section 8 in 1965 and the document has the serial number 202.  The name of the designer usually appears on the front page and initials on the drawings indicate the draughtsman (I think that they were all men in those days!).

 

MN3/502 No. 8.202 (65) This is the infamous "Tingey Tiny Telly".  Peter Tingey worked for a domestic television manufacturer before he joined the BBC and he was skilled in making relatively low cost and physically small equipment.  Professional television monitors were large and expensive in 1965 and there was a need in the BBC for something much smaller, lighter and cheaper so Peter designed the MN3/502.  It had it's limitations, but was used in many situations and became quite well known - hence the nick name. Extracts from the DDMI are in three parts: cover, text and drawings.  (Document contributed to bbceng by John Brooks.)