Hey , Ive got a Marshall Jcm2000 DSL401 . I know that replacement valves are cheap (EL84) but how much in €'s would it cost to get the amp biased when new power tubes are bought?
you can do it your self you need something like this http://www.thomann.de/ie/tube_ampdoctor_biasmaster.htm and you're away on your own all you need is the values which can be found on the web
Varies greatly per tech. Mine asked 60 euro, but he also diagnosed the entire circuitry for weak welds etc.