The module on the right is for Siemens V/U 2xx. modules....
But I didn't finish it, I was planning to add a 48v switch with protection, a switched -20dB U attenuator, and -40dB U-pad for line use (it was meant for my U274 that can also be used as diode bridge limiter).
I also still have a stereo W 492 EQ module here that I still haven't finished.... I'll send that to you as well Cemal, I won't get to it anymore....... It works, but it needs some wiring for the bypass function.