1969/70 Guild Slim Jim with Marshall 100w + Marshall 8x10 cab.
It wasn't too much of an issue. As you can see I played fairly close to the amp. Sometimes I used a split lead to play through the Marshall setup and a Carlsboro 100w PA amp driving 2 4x12 PA columns. I placed one column the other side of the stage so bass player could hear meWow, how did you prevent/control feedback with a hollow body and 100 watt stack?!