Expressimo RB 250 mistracking issue


I have a mistracking issue with my Expressimo RB250 / Shelter 501 MK II combo.

I was away for 6 months and wasn't listening to my vinyl rig, now when I got back I noticed that my cartridge started to mistrack a couple of LPs I own.

Those LPs are Direct to Disk editions that have a few very dynamic passages recorded but the cartridge was tracking them fine before. Now it mistracks them (you can clearly hear it on a drums solo when a drummer hits snare drum). Also on a Hi-Fi News Test LP I can only successfully track tracks 6 and 7, but not 8 although I was able to tack #8 before.

So what could've go wrong? I tied to adjust anti-skating, but I increased it all the way to the top limit and it still mistracks. I remember before I had anti-skating set at around 1.4 - 1.5 on the scale from 0 to 2, now even if I move it all the way to 2 it still mistracks.

I'd highly appreciate if anyone could help/recommend what can be done to fix this? Is it a tonearm settings or cartridge problem or something else?

Thank you in advance.
jimtyrro
Mistracking is just a skip that didn't quite make the jump into the next groove. We're talking about differences in degree, not in kind, so any possible explanations apply to both.

I haven't had a Rega style arm for several years (and never had this problem when I did) so I can't advise specifically on where to look. In general, check where the arm wire exits the arm wand and moves past the bearing. Check it at all points across the arm's arc of travel for any pressure or binding. Perhaps Maktheknife or another Rega owner can be more specific.

Good job that you remounted the cartridge. You said your stylus is clean. May I ask what you've been using to maintain it, and how often? I have rehabilitated over a dozen supposedly faulty cartridges costing from $300 to over $5,000 simply by cleaning the stylus properly. The owners all claimed they had done so, but their methods proved to be inadequate.

Just fishin' for ideas that might help...

Doug

P.S. Have you changed or altered your phono stage since these tough LP's last played cleanly?
OK, I'll ask Maktheknife about wire.

Well, I've never used any liquid solution to clean it, just zerodust and a soft brush. What would you recommend?

As for the phono stage I didn't change a thing.
Zerodust and a dry brush are not adequate for long term stylus cleaning. Many of the cartridges I've rehabilitated, as discussed above, were maintained using exactly that.

Do a search here or on Vinyl Asylum for "Magic Eraser" or click "Threads" beneath my signature, or PM me and I'll send you a document if you like.

I asked about phono stage changes because "mistracking" sounds on dynamic peaks are often not mistracking at all. The identical distortions can be caused by phono stage overload. Since yours hasn't changed, however, that explanation seems unlikely.
Oh, I forgot about it, yes I use your 'Magic Eraser' - just forgot about it. It's in the same 'dry cleaning' group.