On the back of every Mesa Engineering Dual Rectifier, there are 2 switches to select options for the power supply. One of these is to select Bold and Spongy and affect overall voltage to the amplifier, with Bold being full power and Spongy reducing power by about 20%. The other switch is used to select the rectification: Silicon or Tube. Selecting Tube reduces power by nearly 10%, since the tube has losses when it conducts. There are 4 options for running the power supply:
- Bold and Silicon
- Bold and Tube
- Spongy and Silicon
- Spongy and Tube
Before I get to decisions for selecting power supply options, we should cover some facts and history. Along the way, we’ll learn basic information about the differences between these options. (more…)
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