Mechans,
My partner and I do tweak VTF at least daily and in certain listening conditions I've been known to tweak it more often, including sometimes to the individual LP level.
No matter what the specs may say, some cartridges do perform best very near the threshold of mistracking, (ie, near the light end). My guidance for users of the original ZYX UNIverse (for example) was always to play it so and many found that to be best. With that cartridge, the optimal VTF range is less than .01g, below the useable resolution of most scales. I fine tune by listening.
With a cartridge that sensitive, an LP that's easy to track does have a different mistracking point than one that's difficult to track. Thus the opportunity (need?) to tweak from one LP to the next.
Of course this all assumes that you adjust with your ears. With highly sensitive cartridges one can't rely on specs or mechanical measurements for anything more than getting in the ballpark.
My partner and I do tweak VTF at least daily and in certain listening conditions I've been known to tweak it more often, including sometimes to the individual LP level.
No matter what the specs may say, some cartridges do perform best very near the threshold of mistracking, (ie, near the light end). My guidance for users of the original ZYX UNIverse (for example) was always to play it so and many found that to be best. With that cartridge, the optimal VTF range is less than .01g, below the useable resolution of most scales. I fine tune by listening.
With a cartridge that sensitive, an LP that's easy to track does have a different mistracking point than one that's difficult to track. Thus the opportunity (need?) to tweak from one LP to the next.
Of course this all assumes that you adjust with your ears. With highly sensitive cartridges one can't rely on specs or mechanical measurements for anything more than getting in the ballpark.