I am looking for a way to get a nice warm tube overdrive (strat) thru my PA (bose LP1) without micing a guitar amp.  Since I loop (EDP) I don't want my guitar coming out of an amp and PA during the recording phase and then only out of the PA in the looping phase.  
Any ideas on how I can get a nice tone from my Strat w/o micing a nice tube amp?  do I need a tube preamp?  My tube screamer sounds great into a tube amp, but sounds really ratty through the PA.  Is there a PA screamer? 
Best,
Adam