The Internet Archive has digitized 25,000 78rpm Gramophone records
The records I clicked on have this noticeDigitized from a shellac record, at 78 revolutions per minute. Four stylii were used to transfer this record. They are 3.8mm truncated conical, 2.3mm truncated conical, 2.8mm truncated conical, 3.3mm truncated conical. These were recorded flat and then also equalized with NAB.The preferred version suggested by an audio engineer at George Blood, L.P. is the equalized version recorded with the 2.3mm truncated conical stylus, and has been copied to have the more friendly filename.I'm trying to guess but can't imagine what the reasoning for this is. I've tried A/B/C/D testing a few tracks on some crappy speakers and can't discern any difference.While it's certainly admirable to try and digitize it as thoroughly as possible, I just can't see how a difference of 0.5mm in the stylus width is worth increasing your work load 4x times over (having to record each record 4 times rather than just once).