I recently sold my DAC-AH to a fellow HC'er. It arrived in good shape, but he had the following issues with it:
I received it back today, again in good shape. I briefly powered it up without making any audio connections and there was no tingling or any other feeling of electricity. I touched the case in multiple places, including the RCA sockets. When I was using the DAC, I never had any electrical problems. One difference is in how we used it. The buyer used an optical connection between his source and the DAC whereas I always used a COAX connection.
I'd like to debug this without electrocuting myself. I have only very basic electric circuit knowledge and definitely need some help. Could anybody suggest what is happening here? Why did the buy have problems, even after changing power cord, electrical socket and RCA interconnects?
Thanks in advance for your help.