This is off topic, but I'll post it here rather than contacting you directly because other people may also be interested.
You sound like someone who may be able to answer this question.
I recall Delia Derbyshire's original Dr Who theme having a much warmer and subtler oscillator timbre than any of the later versions.
I don't have a copy of the original theme, but I've tried synthesising the timbre as I recall it, and I've never quite got it. I'm presuming it's an old valve oscillator, probably well warmed up by the time it was committed to tape. The synth oscillators and test-tone oscillators I've tried aren't the right sound, and processing still can't quite get it. I've even tried adding sine waves at different frequences to get the effect of a basic tone plus harmonics, but that didn't quite do it either.
There are a lot of test tone oscillators about, but I suspect I could buy dozens, maybe hundreds before finding one with that tone.
Do you know if there's a sample recording somewhere of the basic oscillator sound Delia used? Or if you have any information on oscillators that have that particular richness, I'd be interested.
- thanks