Hi All, I was wondering if someone could give me some advice. I was stupid enough to connect the RCA outputs of this DAC to the OUTPUTS of a preamp in a headphone amplifier. The result is that while the headphone amplifier seems fine, the DAC (in the pic) is powering up, but not working anymore. I've inspected it for visual burns, blown caps etc but couldn't find anything. What do you think would be the most probable cause of damage? Could it be the DAC chips (which are 8 in parallel, all removable - good old Philips TDA1543 on 8 legs in the second pic). I'm not well versed in electronics, but have a multimeter and soldering equipment. Is there something I could check for failure? Any advice would be appreciated..