They had "12 sine/square wave generators (Jason) associated with keying unit and adjustable decay unit (workshop construction)."
We had 12 Jason oscillators which were bought at places like Laskys or Radio Shack or whatever. They had a complete sort of 'sweep' knob, and it's all very floppy and flexible and it didn't bear any resemblance to the readings on the dial, you had to mark the dial with a chinagraph pencil, put the same note on in different places on all of them.
I did the Dr Who theme music mostly on the Jason valve oscillators. [...] There were 12 Jason valve oscillators, with 8 electronic gating circuits, built in-house. [...] The Jason was just swoopy, you know Dr. Who swoopy.