Tektronix 475 Possibly DM or other optional board ???

Craig Cramb
 

Does anyone have the parts details on a A9 board possibly in a 475 series that calls out the Part #670-2239-24. All the 475 manuals I have stop at extension -12 and don't indicate this specific board extension -24. as to what is specific about it. This is a Tektronix built board replacement board in a package not out of a scope.

Craig

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