They were big and loud. The pre-amp head weighed next to nothing. There are plans online that can recreate the basic head in a foot pedal.
One thing that I didn't realize until too late - turning the volume knob down didn't stop a signal from going to the speaker. My old band did the typical dimed out finish, and then leaned the guitars against the amps as they fed back while we left. One night, instead of turning the amp off, they turned down the volume knob. 2 minutes later, as we were starting the encore, I looked back to find the speaker exploding into flames. I thought someone had thrown something in my amp, until my repair tech told me what he found.