A great site for old test equipment is
<http://www.logsa.army.mil/etms/find_etm.cfm>. If the US
Military had
it as a standard piece of equipment they will have the
manuals on-line.
Both TM 11-6625-2735-14-1 and TM 11-6625-2735-24P-1 are on line and
cover the Tek 475. Good luck gathering the smoke...
They also seem to have Tek 2645 stuff online,
but, unless I'm doing something wrong, it
wants a login.
Antonio
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Antonio Carlini arcarlini(a)iee.org