Question about 12/18/73 Purported AUD from on-stage mics

[Uliteute]

well mics on stage can result in fine aud tapes..esp in early times when equippment to record with wasn't as great as today > the mic picks up the monitor-mix  and that might be better than a distant recording with lots of talk and other noise
whether the 12-18-73  is one of those i don't know...but jim powell had a fine source for it as i traded with larry slavens too and most of his tapes were worth getting
uli teute