Jerry Garcia’s McIntosh amp


Does anyone know what model McIntosh amp it was that Jerry used when he played live onstage?  He sure seemed fond of it and I might like to play my guitar thru one as well.  Thx,  Gordon
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It’s not that I want to sound like Jerry, I have no illusion of anything like that.  Nor do I have the skills.  I was just curious of what amp is was behind him that he would adjust from time to time.  I’m gonna buy that book that was suggested earlier in this thread when I get back to SF called Grateful Dead Gear.  
But I must say, John Mayer sounds very good with Dead & Co. and he takes me back to the good ole days sometimes.
Great timeline of Garcia's guitars, also discusses his amp setups over the years. 

http://dozin.com/jers/guitar/history.htm

My favorites were Wolf and the Gibson SG.