old school.
He used the Reel To Reel Tape Recorder for delay and it's overloaded input as a boost. Marshalls are 200 watters but modded with a MV.
Definitely Treble Booster in there (used his entire career)
He used the same rig when I saw him the following year at Rainbow's first two US shows...
I played it all morning. What a great sounding.Strat.
Once I tweak the set up my own specs, it plays great. There’s something about that big fat baseball bat neck, and those big frets.