I have just created a page on my site dealing with Darryl Hock's Aurora Multi-Standards Converter:
http://taggart.glg.msu.edu/ich/aurora/aurora.htm
The Multi-Standards model covers almost every old TV standard out there, but it is pricey for those interested primarily in 32/30-line mechanical TV. Fortunately, Darryl's Model SC32/30 will do the job at a relatively modest price ($225) considering the technology.
HOWEVER, for the very best results, it is best to drive the unit with a PAL source for generating 32-line/12.5 fps or 30-line/12.5 fps NBTV. See the web page for details.
Ralph