UPDATE: I talked with Al on the phone today (Saturday). The Flot-A-Tone is not a replacement for his regular gig rig, a Bandmaster clone by Mission Amps. He recently bought the vintage amp from a friend and wanted to try it out in a gig setting. The "Q" is small so it was a suitable venue for the 20-watt Flot-A-Tone.
I am partial to 6L6 combo amps with a 12-inch speaker, like Al's Flot-A-Tone and my 5F2H. They have a nice honky tone with good definition, and good crunch when you want it. Lately many harp players clamor too much for huge bass tones from monster 4x10 amps. Little Walter never sounded like that.