hi folks, thanks for the reply, I appreciate all the info.
here is an article where brad talks about using a boogie iic
http://www.guitarplayer.com/artist-lessons/1026/whammy-bar-pyrotechnics/14532
“The ‘Sister Christian’ solo was me playing in the control room with long cord out to my Boogie Mark IIC, which was cranked up in the live room and playing back through big, huge monitors in the control room, super loudly. I had a feedback loop going and was able to carry those notes.”
I would think it was a C+ based on the timing of when the NR album was recorded/released. thoughts?