What cartridge is it, how old is it, have you tried it on another TT or have you tried a known 'good' cartridge on this BG4002?  Suspension failure is a known problem on MMC cartridgesand is possibly the problem.  Sibilance issues have been recently discussed and shown to be just this issue with the cartridge - not the actual BG itself.

Dave.

To me, what you describe is the dull sound of a worn-out cartridge. 🙁

Thank you guys. Cartridge is MMC20EN and was sent to me as a replacement for cartridge destroyed  when shipping TT to me, so I do not know how old it is or if it works correctly on different machine. Also I never heard my TT with another cartridge.

BUT I really think the cartridge is not the problem since it really starts OK and then it gets worse and worse. I will try what Lee is suggesting and let you know.

Thank you very much. 

libor wrote:

BUT I really think the cartridge is not the problem since it really starts OK and then it gets worse and worse. I will try what Lee is suggesting and let you know.

I have an MMC3 which does this.  If it happens to land just right on the vinyl, it plays great for a short while and then behaves as you describe.  Other times it's bad all of the time.  If I put a known, good, retipped cartridge from Axel on the same TT it plays perectly with no issues.  The bad one obviously has a suspension issue as I can see the cantilever moves too freely about its axis.

I can 99% guarantee that it is the cartridge.  Don't mess with anything else unless you can show otherwise or else you risk creating even more problems.

A similar thread recently about sibilance went the same way.  We all said 'it's the cartridge' but the OP would not accept the knowledge/experiences of people here. The TT was checked at Lifestyle AV and the cartridge was indeed the problem.  It's up to you whether you listen to the advice given here but I suggest you consider it.

Dave.

Agree with above - it is the cartridge! 🙂

Thank you again guys. I am here to listen and I believe you, but I would like to be 100% sure before I accuse seller of sending me faulty cartridge:) 

I have been testing it for four days and I have tried many records and first track is always almost good, middle tracks are bad and last track is just terrible. Again always, no matter if I put the record on, go to the last track, play for a while and then go to then first track. Always in any combination it is the same.

Dave writes:

"If it happens to land just right on the vinyl, it plays great for a short while and then behaves as you describe.  Other times it's bad all of the time."

In my case it is never bad all of the time and it doesn't change after a short while. It is always good at first track and terrible at last one. 

This coherence just makes me uncertain. If it was as Dave wrote I would send it for retipping immediately.

So after reading this, are you really sure it is the cartridge? No doubts?

Thank you for your time and excuse my terrible english:)

Sure your records are undusty? I had similar symptom, and reason was clearly dust buildind up during play 😉

Nope, it's not dust, I bought brand new LP yeasterday, same problem. But thanks indeed:)