Thanks Extreme phono for your useful comments. I am
using SME 309 with my Koetsus and wonder what bias to dial in. Using a test record does not seem to produce the best sound. Both of my cartridges are old- an
original Onyx and a more recent red K sig. It is quite
likely the suspensions have become weak but the diamonds are still (according to Expert Stylus Company who inspected them recently) servicable..