Out of curiosity,you all act like its impossible and unusual thing to do,yet Keysigt,Lecroy,CIC and others make large number of various high voltage probes for oscilloscopes,not only that,there exist commercialy avaliable high voltage RF amplifiers,they make them blindly without measurement? My question is,what are these numerous HV RF probes supposed to measure if you say they cant measure my HV RF amp?
You write that HV and high frequency is problem,but why do they bother to make them flat to hundrets of megahertz,why would company spend R&D money to create useless HV RF probe? And these high voltage low current RF amps,since its impossible to measure ,then I guess all the specs of distortion and noise must be lies since they cant test them.