@rauliruegas
The answer is 45rpm 7’inch vinyl records, those records are small jukebox format, there are ONLY about 3 minutes of musical information on each side and the best alignment to reproduce this information is Stevenson alignment. Some of the rare singles released on 7’inch vinyl (aka 45s in collectors world) has never been releaeed on LPs, which make them unique and highly collectible. There are millions of records released in the USA on idependent labels ONLY in 7’inch (45rpm) format in the 50s, 60s and 80s. Even if the LP with the same track exist, the single (45 rpm / 7’inch) most likely will be a different take and different version, sometimes much better than LP version. Those signles made for radiostations, for dj use and for jukeboxes. But i will repead again that most of the 45s has never been released (originally) in any other format such as LPs or 10’inch for example. This phemomena is well know for Jazz, Soul, Latin, Reggae music lovers and collectors. Stevenson alignment is the best for 45s (7’inch records)
more info here: https://forum.audiogon.com/discussions/time-to-choose-baerwald-lofgren-stevenson
For me it does not make sense sacrifice 20 minutes of the recorded LP surface in favor of the last 5 minutes especially because over those 20 minutes the distortion levels goes really higher against Löfgren A or B.
The answer is 45rpm 7’inch vinyl records, those records are small jukebox format, there are ONLY about 3 minutes of musical information on each side and the best alignment to reproduce this information is Stevenson alignment. Some of the rare singles released on 7’inch vinyl (aka 45s in collectors world) has never been releaeed on LPs, which make them unique and highly collectible. There are millions of records released in the USA on idependent labels ONLY in 7’inch (45rpm) format in the 50s, 60s and 80s. Even if the LP with the same track exist, the single (45 rpm / 7’inch) most likely will be a different take and different version, sometimes much better than LP version. Those signles made for radiostations, for dj use and for jukeboxes. But i will repead again that most of the 45s has never been released (originally) in any other format such as LPs or 10’inch for example. This phemomena is well know for Jazz, Soul, Latin, Reggae music lovers and collectors. Stevenson alignment is the best for 45s (7’inch records)
more info here: https://forum.audiogon.com/discussions/time-to-choose-baerwald-lofgren-stevenson