I have a friend in Hull with a Mesa Baron power amp that takes 12 x 5881 tubes - bit of a beast and it actually sounds very good. I believe it was modded at some point to run 100% in triode mode (in its unmodded state each push-pull pair is switchable between triode and pentode).
He's just retubed it and getting issues with the bias meters not apparently being able to be set correctly.
Anyone or any suggestions of who can help with this, handy for Hull or the East Riding generally? Really need someone to take take a proper technical look at it and repair if need be?