You can use simple LC PS, "Guinevere" style, you`ll need about 500-0-500V secondary (depends of the output tubes), current capacity of the transformer and a choke again depends of the output tubes. For rectifier diode(s) there`re various options, for example GZ34. For more (details, possible group buy, etc.) try "Group Build". Doug built the prototipe, and I`m sure that he`ll answer your question in more detail...