In 72, Jerry would have only had a Wah pedal and in March the Blaster would have began being used. So it would make sense since they were creating a 72 show Jeff would have the paired down effects chain. But he still used a Modded SMS Classic, Mcintosh MC2300 and JBL's , pretty much the basics of Jerry's rig up til the end.
Disclaimer: I make and sell Buffers. I also sometimes Modify, Build and sell preamps and amplifiers. My opinions are not intended to be sales pitches. I am a one man shop and prefer to spend time with my wife and family, i work full time on call and love to spend my spare time doing other things. I only make, modify or build things for those that seek them.