Peavey 5150 Signature Fx Send or Preamp Out

You mean going straight to a mixer/interface/preamp from the preamp out? Well, it's not that good of a sound.
I tried the preamp out of both a 5150II and an Engl Savage SE, and they both suck. Preamp outs can be useful for monitoring in some situations, but I wouldn' record them.
Just stick a 57 in front of the cab...
 
You mean going straight to a mixer/interface/preamp from the preamp out? Well, it's not that good of a sound.
I tried the preamp out of both a 5150II and an Engl Savage SE, and they both suck. Preamp outs can be useful for monitoring in some situations, but I wouldn' record them.
Just stick a 57 in front of the cab...
I think he intends to use an impulse afterwards.