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The GIA-275 looks interesting, but I'm frustrated by the shortage of reviews and published details. Any pictures of the insides anywhere online? It has more power, but how does it sound compared to the PS Audio Sprout and NAD D3020? Where does it say that the amp is Hypex? I can't find a Hypex-U80 module. What is the opamp buffer chip in it? Is the power supply Hypex too? What drives the headphones? Opamp?, TI headphone chip?, discrete class-A? I'm using 300 Ohm Sennheiser HD-800 headphones, do they work well? BTW, I'm a longtime Adcom fan with two GFP-750 preamps, one stock, the other I modified with Black Gate N capacitors (when they were available).