You might talk to a local service company, or see if www.matco.com can help you.
: I want to build a tube operated test load
: I am tageting specs such as 500V-500W and i'd like to incorporate dynamic capabilities to mesure current surge potential
: Who could put on on the track either of schematics or suitable tubes (cheap + easilly available +parallel operating capabilities)
: I appreciate any help
: Mike