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Meandering Pitch, Where’s The Problem?

As I’ve mentioned in other posts, I’ve been modifying a Thorens TD 160 MK1. It is and will remain a dedicated mono table. Currently, I’m using the original TP 16 MK1 tonearm with an AT 33 mono cartridge. I will eventually replace the TP 16 with an Origin Live tonearm and EMT mono cartridge. I still however like playing records while in it’s current state. What I’ve experienced with a number of classical records is pitch instability. Primarily when playing piano recordings. There are certain passages that are a problem and I’m not exactly sure the cause. My cartridge is aligned using Baerwald. I understand that with some records, especially very old mono vinyl, that the pressings could be off but if that were the case, then the entire album would be an issue. I do need a new belt but I’ve still had this issue with a brand new Thorens or Origin Live belt. Just wondering what others think and if there’s an antidote? Thanks!

goofyfoot

Showing 1 response by fusian

fusian
129 posts
 

On my off-Centre records, the pitch instability seems to get worse as the stylus gets to the innermost groove area. Does yours do the same? If it is an off-centre pressing, you will see the cartridge meander back and forth.

I imagine many of your mono recordings are old - or perhaps they were cut during the stereo era on an old lathe and it had speed problems? That would bake the wow and flutter into the vinyl.

I imagine you have checked the motor, and the condition of the pulley and belts?

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