I have a Melody 12A3 integrated amp, and bias is on each side, two tubes per side. There is a one opening for the ground probe of the meter and separate holes for each tube for the positive meter probe. There is a hole with a small flat head screw inside between the ground and positive holes and the desired voltage is printed on the sides as well. Just turn the screw until the desired voltage in DC volts is reached on the meter and you're done. Don't know if yours is designed the same way.
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