you should define your working ways of TWT,if it is single pulse,then you can buy it from RUSSIAN,its kind is relative TWT,about 1GWof single pulse ,or the pulse repetive frequency is about 100Hz,if you find CW TWT about the 8000KW,that is impossible
8) Hi cdlonesome,
Confirm is it 8000 kilowatt or 8000 watt,
and if it is 8 megawatt in a continious mode i think it can be used as weapon, something that they show in Starwars or so.
High power is possible only in pulse applications according my knowledge.
and by the way what is your application.