what is value of two toroids for topload?

["John Morawa" <morawaj-at-interaccess-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Hello,

When changing the topload from a one toroid to a two toroid configuration
(small toroid on bottom, large on top) how do you calculate the total
capacitance?  Does it go down (caps in series) or does it actually increase?
I want to know so I can adjust the QTC.XLS spreadsheet appropriately.

P.S.  Thanks everyone for all the input about increasing primary tank
capacitor size.

Thanks,
John M.