>i'm also nearly nearly certain it's a square or pulse wave used for themodulation.
Quoted from my friends email:
"....(from Brian Hodgeson, who actually did the Tardis, so he should
know), it was a Post Office ring modulator they used, along with
a BBC PEU/1 passive EQ (a big grey box with switchable low
pass and high pass filters). The original ring mod was lost when
it was borrowed by BBC Television to do some extra bits of Dalek
voices, and they mislaid it permanently. The VCS3 proved able to
do an adequate job instead. Note that a triangle wave was used
as the other input to the ring mod, not a square wave."
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