The BBC Research Department has its own Web site with many interesting documents - including ones of historic interest - right up to current matters of investigation and research.
This particular paper details the use of transistors in many items of Broadcast equipment - and shows circuit diagrams of microphone amps, line sending and receiving amps and PPM drive circuits. It is dated 1963:
http://www.bbc.co.uk/rd/pubs/archive/pdffiles/monographs/bbc_monograph_46.pdf
This particular paper details the use of transistors in many items of Broadcast equipment - and shows circuit diagrams of microphone amps, line sending and receiving amps and PPM drive circuits. It is dated 1963:
http://www.bbc.co.uk/rd/pubs/archive/pdffiles/monographs/bbc_monograph_46.pdf