R&D Report 1970-37 : Field store standards conversion: Description of the C06/506 converter S.M. Edwardson, R.E. Davies, R.V. Harvey, V.G. Devereux, D.W. Osborne, D.W. Stebbings, G.M. Le Couteur The report gives a technical description of the BBC Mk. 2A (C06/506) field-store standards converter, which operates in the direction 525/60 NTSC to 625/50 PAL. The equipment is very complicated and a preliminary simplified description is given to help with the later sections; throughout the report, the description is limited to the block diagram level and much detail has been omitted. The report ends with a section describing selected aspects of special interest.