Been using the Mesa Mark V 90 for the past few days. Yesterday I hooked up the slave out to my BluGuitar poweramp and that worked nicely to adjust the balance between Mesa combo speaker vs 4x10.
I would have used the Fryette PS-100 but it's malfunctioning again. It works but there's a ton of hiss even with nothing connected. I'm guessing there is a cold solder joint or a failing component that for some reason worked before.