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2) Calculate what bias voltage reading you will set your tubes to (in this case, we will
use 35mV)
3) Place your red probe in the LEFT BIAS jack, and the black probe in the COM jack.
4) Turn the bias potentiometer shaft SLOWLY until your DMM reads 35mV
5) Wait 1 minute
6) Recheck all power tube bias measurements
7) Readjust bias potentiometer shaft if necessary
Note that, the bias above is when SOLID STATE (SS) rectification is selected. When Tube
Rectification is selected, the plate voltages inside the amp will be lower, due to the drop
introduced by the tube rectifier.
However, this has already been compensated, for bias, by a resistor inside the amp that
changes values when you toggle the Rectifier switch. Hence, you do not have to rebias for
Tube Rectifier operation.
A FEW COMMENTS ON BIASING
Due to the nature of vacuum tube amplification, there are inherent risks when biasing your
amplifier. Extremely high-voltages are present, and vacuum tubes reach high temperatures
during use.
The risk of electrical shock and/or skin burns should ALWAYS be kept in mind. Therefore,
bias at your own risk, and only while paying attention and taking all precautionary
measures.
Biasing should only be done on a clean workbench with no distractions. Do not wear loose
clothing or any jewelry. Take your time, and think carefully before each step.
Again, bias at your own risk. Ceriatone Amplification is not responsible for any damages or
injuries resulting from user biasing.
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