I caved in to the commercial route and sold out to a manufactured product, the Onkyo A-9050. You might wonder why. I certainly did.
The chain of logic is that I needed to fix the power amplifier situation and I don’t have the bandwidth to design and assemble a power amplifier… so I started looking around for options. I am cursed with the knowledge of what is audible, so I don’t fall for the audiophile stereotypes of what is needed… class A, Tube, etc., etc.
It then boiled down to what would serve the duty and fit in the physical location. I looked at many amplifiers, but focused on integrated because there are so many more integrated than single function amplifiers. My biggest constraint was depth!
So i jumped on the Onkyo A-9050 from Crutchfield. $400 and no tax, no shipping. Sweet, and it has a built in DAC which I will check out.