Delia Derbyshire in 1986, in a picture from Clive Blackburn.
Ron Grainer, composer of the 'Doctor Who' theme tune.
The mixing desk in Room 12. The quadrant faders shown here were replaced by carbon sliders by the mid-seventies. Note the metal gangers for linking the faders. To the right are preset level controls, echo select, echo mixture and group switches. To the left are four PEUs. In the centre are remote start facilities (not used later on), cue light, talkback and line-up tone keys, as well as a standard mono Peak Programme Meter (PPM).
A sideways view of the mixer in Room 12.
Brian Hodgson presses a key on the keying unit and checks the frequency of the signal produced by the appropriate Jason oscillator. Every oscillator had to be tuned by hand. To his left is the wobbulator. The long box above the oscillators is a simply a power distribution board fitted with special E&S mains power plugs, used by the BBC because they were less likely to be stolen.
Circuit diagram for the protoptype keying unit.
Interior of the prototype keying unit, complete with sets of input and output transformers.
This keying unit isn't the one used by Delia Derbyshire for the 'Doctor Who' theme. In fact, two final units were built, one by Dave Young, the other by Bob Windsor of the Film Unit. The one shown here is connected to a set of Advance N1 oscillators.
Room 13, with prototype keying unit connected to seven Advance oscillators. The wobbulator is to the right. According to the calendar, it's September 1963.
Controls on the keying unit for setting the attack and decay times.
