![]() ![]() This results in the voltages shifting and forcing the output tubes’ bias point to shift off target, oftentimes causing the tubes to shut off. ![]() As the components start to heat up, they drift causing audible volume changes that are caused by the components as they drift in value. The longer the amplifier is played, the more the heat builds up. The issue that causes the bias to drift is related to several factors: The type of components (resistors) that were used to populate the board and how they respond to heat, and the routing of power traces near sensitive components. It’s been discussed at length on countless fan forums and since around mid-2004 the issue was resolved in manufacturing by Marshall. The early versions of the JCM2000 were prone to an issue that has been coined the “bias drift” issue. Both models offer 100W (watt) and 50W versions, available as a head or combo. The Marshall JCM2000 has been released in several configurations: the Dual Super Lead and the Triple Super Lead.
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