for sale: A pair of Siemens V275/0 summing discrete amplifiers manufactured in the early 70's. Very good quality with Haufe transformers in and out. Very good sound either. They are coming in original condition, working when pulled out from dismantled desk some years ago, sitting here since thenand waiting for a project which never happened. May need recapping (Frako caps). If you plan to built your summing box, there is nothing better buy. 200 EUR per pair. Very good optical condition.