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Wierd. Well, my PB1 definitely has a continuous phase adjustment knob. If I knew how to post a picture of my amp, I would. But the amp in that picture Johan linked to is very much different from my amp. From left to right, my amp has gain knob, phase knob, auto on/off switch and crossover knob...

Good write-up. Although I am unsure why you describe the PB1-ISD (now PB12-ISD) as not having a continuous phase control. My PB1-ISD has a continuous phase control from 0 degrees to 180 degrees, not the flip switch you describe.