I could not find a schematic - do you have one? (I
realize it's a straight
forward switcher, but I like a picture :-)
Here's a scan from the 11/45 engineering drawings which includes the H744:
<http://www.mainecoon.com/classiccmp/PDP-11-45/PDP-11-45%20system%20ED%20(H744-45-46-54%20&%20G772)%20part-g.tif>http://www.mainecoon.com/classiccmp/PDP-11-45/PDP-11-45%20system%20ED%20(H744-45-46-54%20&%20G772)%20part-g.tif
--tom