I too must proclaim my intense and undying love for Diezel amps. My schmidt is a beautiful peice of technology and my VH4, despite blowing tubes fairly soon after I got it - is godly. I will admit, I'm a little aprehensive to retube and bias it, as it would be my first attempt doing so, but hopefully the tutorial is a resonably accurate representation of what it's like to bias the VH4 with newtubes .