[Amps] Output Impedance 4-572B's in Parallel

[R.Measures]

>Sorry if this has been asked & answered before; just searched the
>archives and couldn't find it.
> 
>What is the load impedance of four 572B's in parallel, 

**  RL is a function of the anode supply V..

>Taylor's not
>Svetlana's, as in a Clipperton-L?  Can't find the data.  Thanks in
>advance.
> 
>73, Tim, W2UI 
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