Stumbled upon this little bad boy because of the exact same reason as you. I was searching for fully balanced portable amps. Which there aren't many of. It boggles me why there isnt any information about this amp on the internet? - As much as it did you, it seems. Did you try taking it apart? I'm familiar with that type of case from my 8x TDA1387 DAC/AMP. Usually if you unscrew the 2 bolts on the backplate, you can slide the font end out by pulling the potentiometer. If you're up for it, I would love some hi-res of the internals of this weird fellow. Either way, thanks for the review!