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That gave me an idea, I have some old 78s -- could I play them at 45 and then use Audacity to speed them up by 173%?

Audacity wiki (which is the official documentation and not something you can request an account for IIRC) has a page for that: https://manual.audacityteam.org/man/recording_78_rpm_records...

Just make sure you invert the equalizer / preemphasis before you change the speed.

Yes.

Or play them at 33 1/3 for better resolution.