The 6P6S (6П6С) output beam tetrode was designed for amplification of low frequency power. It is direct replacement for the 6V6GT or 6V6 from the former DDR. It replaces also the chinese 6P6P normally (without any mechanical adjustments). All of the available tubes are NOS and tested. Produced in the 70's and 80's by Reflektor, Saratov.