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    Building, troubleshooting and testing of these amplifiers should only be
    performed by someone who is thoroughly familiar with
    the safety precautions around high voltages.

working out Z out for tube with IXYS IXP10M45S plate load

Hi There
I would like some guidance as to how to work out Z out of a tube with its plate load being supplied by the IXP10M45S.
I have read the article at [email protected] and I figure It probably should be MU follower formulas given the output is taken from the anode of the driven tube.
Given the Current regulator does not have the plethora of caps and resistors though, I am wondering if it may be accurate.
I would appreciate any help
Thanks
Nick