What is the best way to drop out a background to white?

I have several quite old architects drawings to reproduce. The problem is that with age, the original paper has yellowed and foxed. Can anyone suggest a good way of dropping out the background to white so that the image will look nice and clean when I print it, please? Normally I would bring the white point slider up in Levels and sort of burn it out, but I was wondering if there is a more subtle method of doing this. The trouble is I don't want to loose detail in the fine pencil lines at the same time.
Thanks everyone - Brian.

Thanks for that, I'll give your method a try.
No no, I don't mean an insult - you read it wrong! Last thing I would do when asking for help... No, I mean that just 'turning up the white level' is crude, in that it looks like its been blasted by an atom bomb and looks awful, and I was wondering if a more scientific approach might not be applicable. For example, I've tried putting colour sampler points in the image and then independantly adjusting the R, G, and B levels etc until they match at 255 each, but it still looks blown out, but that's what I meant by being more 'scientific', ie perhaps using some of Photoshop's ability to measure colours to enable me to drop them out, for example.
I found a previous thread along the same lines as this and one suggestion was to use some special filters, but they turned out to be mac only.
The 'forensic' reference was to the Color Deconvolution filter, it was designed for police forensic departments as an aid to help spot where two different colours of ink have been used on a document, for example.
By the way, the drawings I'm working on are not all B/W only, some have colour washes on them too...
Perhaps the only way is to try and select the background areas first and then to drop them out.

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