[sdiy] transformer question . . .

[rkmoore at memphis.edu]

Hello again,

I'm looking to replace the power supplies in my paia 4700.  Just simple
regulated power supplies will be fine
(transformer-rectifier-caps-regulator).  I am having difficulty
selecting a transformer, though.  I will have three voltages, +9V, -9V,
18V (and a ground, of course).  This seems like it would be easy enough
with a couple of center tapped transformers, one for the plus and minus
9, one for the 18.  Transformers of this type seem common and cheap from
mouser.  

The thing that I don't understand is the units that they use to describe
the output.  They give the output in V.C.T.  What is this?  Is it
coil-turns?  I'm used to just seeing a turns ratio to describe
transformer windings and a VA or KVA rating for the power handling. 
Also, are the output votlages given in the mouser catalog peak, rms, or
something else?  

I won't need much power.  500ma per line will probably be more than
sufficient.  I'll have to go through and add up the surrent draw of my
modules again (where did I put that piece of paper . . . . )

Thanks,

Richard Moore