What type of capacitor is this and ...?
It is definitely a 33nF Capacitor: http://www.csgnetwork.com/capcodeinfo.html

And you should be able to replace it with a ceramic one with similar characteristics, just make sure to select one with enough voltage overhead.

Electrolytic capacitors do have better performance but they come at a higher price, and at that power stage you won't require such thing.
I refer to this Application Note when I have that kind of doubts: http://www.intersil.com/content/dam/Intersil/documents/an13/an1325.pdf