Hello, My MiniDisc recorder Sharp MD-DR470 has a four-pin headphone socket and came with an adapter to connect three-pin headphones as well. If I measured this adapter correctly, L- and R- are connected to GND. This is exactly what I expect to happen if I connect a three-pin headphone directly...

Hello, My name is Gunther from Germany and I have already looked at this amazing forum many years ago (back then I was heavily into portable amps, and I still have six from that time). I have now finally created an account to participate.