Diezel's have probably the best master volume of any amp out there. The feel and tones with the master down is nothing short of fantastic. Portable Diezel head would be cool as all their amps are super robust with their massive transformers - however I think that's the key to big tones. I've yet to play any amp with smaller transformers that sound even close to big iron. Hard task for sure to make a smaller wattage amp that sounds like the big brother - only one I know if is the Wizard MC25 - but if Peter is thinking of making one, then it should be awesome.