Hi milkplus, and welcome from across the globe in Washington State, US!
Fire away with questions you have. I may not know the answers, but someone here likely will.
I've not had Decware amps, but have had Dennis Had Inspire amps that have similar designs. Mine were 6-15 watts, depending on the power tubes. My SAM's were a great match at 95db sensitivity. I've tried a range of amps and found Class A designs are a better match than the others. I currently run a ~1978, Japanese made, Pioneer M-22. All Class A, 25 wpc. Best I've had, ever.