7.5 to 8.7 volts on a new critical g2 cx1 and cx2. Standard needles and tubes.
I asked about this on the swash facebook group and Tony Oliver said it's probably some sort of oscillation in the swash plate. (Gen 8 adjustable cutback) I then asked if it was normal to which I received no reply.
I should probably email him and Im sure I could get a good answer, they have been awesome with all of my other questions.