If you use SS rectifiers and a full wave bridge, you don't need the center tap, but you will need a much lower voltage transformer.

You can simulate it pretty closely, The Duncan Amps power supply designer is pretty easy to use and if you specify things using actual values, it's pretty darn close.

http://www.duncanamps.com/psud2/index.html

This is also really helpful, Hammond's rectifier design guide. It shows solid state diode, but the principles are the same. Mostly the full wave and full wave bridge. A typical vacuum tube rectifier is full wave, that uses the center tap. Totally applicable with SS, but going to full wave bridge with the same trans will give a lot more output voltage, as in nearly double.

If you already have the transformer, you can go with SS, center tapped full wave, but your voltage will still be higher, the diodes drop much less voltage than a tube.

www.hammfg.com

Transformer Voltage: A transformer's required secondary A.C. voltage varies greatly with the type of rectifier chosen and filter arrangement. Use the formulas below as a...