one large cap, or a few added up?

You might want to be a bit more civilized. Try this:(http://phonoclone.com/diy_rack.html) Read the last line, as you will be dealing with non-polarized caps(forgive his spelling).

An excellent source for high quality caps, and Michael will also match your caps to within 1%: (http://www.percyaudio.com/Catalog.pdf) I've used DynamiCaps in Maggies with great results. auriCAPs are also an excellent cap: (http://www.partsconnexion.com/t/catalog/CapacitorsFilm.html) Whatever caps you use, be certain to observe proper lead(outer foil)orientation: (http://www.audience-av.com/capacitors/a_applications.php) Another service that Percy offers is marking the outer foil leads on the caps he sells. Keep in mind that when you first replace the caps, and fire the system back up; it probably won't sound great. It takes a while, with operational voltages, for the dielectric in a high quality cap to "form".