I realize this is way after the fact, but... The headphones in the photo are Beyer Dynamic's ET-1000 which is an electrostatic model introduced in 1976. The N-1000 refers to the adapter box which is necessary to drive the speakers. The N-1000 adapter needs AC power, and speaker power from...

Hello bjackson, I just joined the Head-Fi forum looking for info on the Beyer ET-1000's. I have two complete sets of these headphones along with the N-1000 adapter. I also have the paperwork, including a schematic of the N-1000 adapter which I believe has the pin information you need. If...