Granite City 2 ==> tek 1101
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This is a Tektronix type 1101 accessory power supply. I have no idea
what is it that it supplies with power. The unit powers up. It has a
very important flaw: the power switch has a lever that broke off.
So you can move it with a screwdriver or something. Could not test the
unit further because I have no idea what it is supposed to do.
:SATISFACTION:
(Click on the thumbnail images to enlarge)