interesting. I use a PF500/115HE rig and have been considering a VT Bass Deluxe as a DI and to get an more predictable tone from backlines, but not to use in front of my PF500. What do you feel that you are getting when you use the VT in front of the PF preamp section. I mean, the PF series already delivers a pretty convincing traditional Ampeg tone, how do you think the VT adds to this ? is it like 2x the Ampeg goodness ? Also, it is my experience that the PF is not a particularly "flat" sounding amp at all, it has a very distinct Ampeg/Baxandal sound baked in ( I mean this in a good way BTW).
just curious.