terry, snip>>>> My "pals" at Jennings could sell me vacuum contactors at $2000 a piece but that is kind of rough even for me. snip..... you may want to check out fair radio www.fairadio-dot-com they have some Jennings relays listed in the with multi KV ratings in the MHZ range ... I am not sure if these are what you were referring to but I thought I would mention. Robert Cressler