OK, we dropped the bias to 76 and I am trying 2 NOS tubes from a friend. I am running a Telefunken ribbed plate in V1, a Tung-Sol reissue in V2 and a Raytheon black plate in V3. I was told to try the Raytheon in V2, but it was very trebly sounding. I have not yet purchased a Brimar. The amp definitely sounds better, somewhat warmer. However in the long run I may end up just selling the Marshall. What is your opinion of Splawn amps? thx!