6DJ8 balanced for your RM-9 MK1 and MK2. These go in the V1 socket.
Your choice of Yugoslovian (EI) or Russian tubes. We have found that Yugoslovian tube stays quiet longer, while the Russian tubes are more quiet to begin with but don't stay quiet as long.
Our Low Noise tubes are a superior tube especially tested for today’s quality line stages. Only 30% of the tubes we test perform well enough to be considered Low Noise.