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This looks like an interesting show: https://en.wikipedia.org/wiki/Salvage_1
. Never heard of it.
Unfortunately, for something this old (70s), assuming there's never been re-runs (and it doesn't look to have any), you're at the mercy of 70s Betamax/VHS users (not many in those days), film stock copies, or nth generation VHS/etc from it. Sadly, DVD releases are often your only hope here.
Been there, done that ... many, many, many times.