Planar2 ABCD Voltages Inconsistent Per Channel

Just picked up a Planar2 and noticed the D channel LED isn’t as bright as the others at maximum. I tested the voltage level and noticed that while channels ABC output from 0V to 10V approx., D only ranges from 0V to 9.2V. I returned it for another but it has the same behaviour.

Can anyone confirm if theirs behaves the same?

That is within the acceptable range of variation for Planar 2’s ABCD outputs.

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Fair enough, thank ya