I will mention here that part of Andrew's motivation was to have a dependable portable receiver to take along with him. His design makes use of the newer miniature tubes (the term "new" is relative, of course.) and he has also designed a Pullen mixer into his Regenerodyne.
The link below will take you to his site. Take a good look at those pictures. This is what homebrewing is all about, gang!
Click here for Andrews's Page, then click on the link to his Forty Meter Regenerodyne.