This time, i hope I can help you in your search; Me too I search the technical manual ( 240 pages ) for my airstream 71.
I've seen, when I was seaching my converter 220 50hz / 120 60hz, there was for sale, copies about models 1975 / 1976,
Even I 'm not an expert, i think the great lines are availables for airstreams with littlle differences in issue date or lenght. if you can find the exactly date for your A/S, certainly you can take the copy to begin works on it and understand the mechanism they use ;
So the site is from germany ( thank you Newstreamer )/