What is an RP10SE? Well it is The single ended version of the RP10B. It was produced before the RP10B. Of cousre if you don't know what an RP10B is, then I haven't really explained anything. This was Rudi's top of the line a few years back. I bought it from fellow Head-Fi'er Decur. It is in excellent shape as you can see from the pics. This is one of the best amps that I have used with Sennheiser HD800s. My reason for selling it is that I have too much stuff and too many bills. So something has to give. I am also using speakers more often than not. I will absorb PayPal fees and pay for FedEx ground shipping to the CONUS. At this time I am only considering offers from the US. Please contact me with any questions about this fine headphone amp. Thanks for looking.