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I'll repeat my earlier recommendation to recycle the old amp.
In all but the most rosy of scenarios, it will cause you nothing but grief. You don't know ANYTHING about it's technical parameters and you haven't even established an actual need for any amplifier. It was likely designed for use by installation professionals in large cable TV systems, probably in apartment or hotel buildings several decades ago. It is unlikely to be a fit for your particular situation.
My recommendation is KISS.
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