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I just did a goodle search for "tektronix 453 manual .pdf" (without the quotations).

I did the same search for the 2230 and didn't find one one the first three pages, but that doesn't mean it isn't out there for free somewhere.

On this page, I found some 22xx different versions, which might be close:

http://bama.sbc.edu/tektroni.htm

There are TONS of Tektronix manuals on there.
 

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