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The included files are annotated versions of the main (non-power supply) section of the
Keithley 225 Current Source. Both files include layers which will allow you, in a suitable
program, to hide or show the annotations as appropriate. Also included in the schematic are
some notes on suitable replacement parts for the original transistors, most of which
are no longer available.

More information on the repair effort that led to this annotated schematic can be found here:

http://www.eevblog.com/forum/repair/keithley-225-(current-source)-repair/

Matthew Humphrey
[email protected]
EEVBlog User Name: motocoder