The Miller Integrators that I have in the parts mule 7B53A are 155-0028-00, but I also have a 5B10N parts mule in the right serial number range to be using a 155-0042-03 part. My notes say "the main selector switch needs cleaning, entire blocks of sweep speeds no working" which suggests that some sweep speeds are working, and hence that the Miller integrator is working. I can double check that instrument to be sure that it is working.
-- Jeff Dutky
