Transmission System : Brief Technical Specification - and some Interesting Letters

Here we have the far-from brief as advertised specification of the three bolted-together Eddystone aluminium boxes that lurked hideously in the F-block technical cupboard cupboard managing many years of faithful operation next to the emergency 'Technical Reserve' home-brew supplies.  Also the little transmitter boxes that lived for many years in attics and on flat roofs in various states of operation.  Many plus points for the transistor emitter-follower based sallen-key 4.5kHz analogue filter section.  Minus a few million for using a '741 hop-amp on a limited supply as a clipper, but then perhaps I'm being picky when you see the date.  1978, fair doos:}  I've no pictures of the units in-situ but as ever, I do plan some crayon drawings of the depths.

There follows some letters which seems to outline a post-1978 update for the main studio, which looks like pretty much what I found when I arrived.  There's plenty of old names to wonder at here.













Now, the letters that were in the back of the file:



Always handy in those days to know which transistor leg was which without engaging on a trip down to the campus data book library:}

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