Tardis Interior Hum 1963-1969 

Wait really? You were born in 1969?

1958 would have been better because you would actually be able to see it air for the first time on November 23 of 1963.

This was used til Planet of the Daleks in 1973

There’s more ‘texture’ and variation in subsequent ‘70’s and ‘80’s ‘humming’; this is closer to a monotone.