well, you certainly need a strat and a marshall. but in fact i'm not sure about the other things..
uli jon roth, paul gilbert, eric johnson, and others i'm sure, can get this singing violin like tone from strats - and i'd love to know how too.. i don't think its just the DOD250 which is the secret, since Roth and Johnson don't use one - maybe it really is a flatout master volume.
vibrato is really important for sure.