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Beogram 4002 Bad Sound Quality

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libor
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libor Posted: Wed, Mar 11 2015 10:09 AM

Hello guys, my beogram is almost ready to rock, after replacing bulb in detector arm, cartridge and so on, but there is one last thing. Sound quality - in bass it is great but in treble and highs it is not. It is noticeable in women voices where I hear rattling and it is just not clear. 

Now the strange thing. At the start of the record it is almost good and then it is becoming worse and worse and the last track sounds like badly tuned radio (bass still good though). I tried many records, reconnected cartridge many times and adjusted aperture position but it is always the same.

I have to say that tonearm is not going unparalleled to detector arm as the record progress, distance between them is roughly the same whole time.

Any thoughts?

Thank you very much.

 

Dave Farr
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Dave Farr replied on Wed, Mar 11 2015 10:18 AM

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.

Lee
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Lee replied on Wed, Mar 11 2015 11:12 AM
Sounds like the alignment is off. If it starts good and progressively gets worse. How is the aperture adjusted?

Remove the platter belt and place a record on the turntable and cue the tonearm to the middle of a track.... When you press play the tonearm should land and stay where it is for the first 2 revolutions of the record, the servo should then run and turn once for each further full revolution of the record.

Lee
chartz
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chartz replied on Wed, Mar 11 2015 12:04 PM

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

Jacques

libor
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libor replied on Wed, Mar 11 2015 1:05 PM

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. 

Dave Farr
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Dave Farr replied on Wed, Mar 11 2015 2:05 PM

libor:
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.

Peter
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Peter replied on Wed, Mar 11 2015 3:29 PM

Agree with above - it is the cartridge! Smile

Peter

libor
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libor replied on Wed, Mar 11 2015 3:53 PM

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:)

Orava
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Orava replied on Wed, Mar 11 2015 4:03 PM

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

 blah-blah and photographs as needed

libor
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libor replied on Wed, Mar 11 2015 4:52 PM

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

Ben_S
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Ben_S replied on Wed, Mar 11 2015 5:06 PM

Another vote for the cartridge here. I've had numerous issues with various MMC cartridges over the years, suspension failure is pretty common.

Ben

Peter
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Peter replied on Wed, Mar 11 2015 8:22 PM

Where do you live? If in the UK, I'll lend you a decent cartridge to try instead.

Peter

Dave Farr
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Dave Farr replied on Wed, Mar 11 2015 9:04 PM

Peter:

Where do you live? If in the UK, I'll lend you a decent cartridge to try instead.

Very generous Peter and to the OP, this should be the first thing you try before doing anything else that could compromise the TT further.  Once the cartridge is ruled in or out, the rest can follow.  If Peter's cart works, it's yours that's the problem and you can return it to the seller.  If the problem persists, there is a fault in the TT and further investigation is necessary. 

Dave.

libor
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libor replied on Thu, Mar 12 2015 6:10 AM

You are really amazing guys. Peter, I am sending you PM.

Thank you.

libor
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libor replied on Thu, Mar 12 2015 6:10 AM

You are really amazing guys. Peter, I am sending you PM.

Thank you.

libor
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libor replied on Thu, Mar 12 2015 6:10 AM

You are really amazing guys. Peter, I am sending you PM.

Thank you.

libor
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libor replied on Thu, Mar 12 2015 6:40 AM

Sorry for the triple post, I do not why it happened.

Also I can't send PMs for some reason, so, Peter:

I really really appreciate what you are offering, it would really help me out. I live in Czech rep. which is in EU thankfully. You do not have to worry, we are not Soviet country anymore and our post is quite good actually:)

I will of course pay for all post expenses and I am more then willing to send you some deposit via paypal or bank transfer.

 

Thanks again.

Peter
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Peter replied on Thu, Mar 12 2015 7:45 PM

Nothing so far - email me -  your address - I'll dig something out! I will want it back sometime!Smile

Peter

libor
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libor replied on Thu, Mar 19 2015 1:35 PM

Hello everybody,

I would like to close this topic and say that you were all, of course, right:)

The problem was cartridge which was clear right after I installed new cartridge and hit play.

Thank you all for answers and mainly Peter, who sent me (without any deposit or anything else) cartridge to test it. And not just any cartridge, he sent the top of the line MMC20CL.

Rally amazing this B&O community is:)

 

Thank you and have a good day. I'll surely have - listening to my -now finally fully functional- 4002:)

Peter
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Peter replied on Thu, Mar 19 2015 3:26 PM

Very pleased to hear it is working. I would suggest the best way forward is to use the 20CL I have sent but consider getting Axel to repair the cartridge you have - you can get it made into effectively whatever you want - I favour the Shibata tipped version which, dare I say it, is even better than the CL. Once you have a new cartridge to your liking, you can send the CL back but no rush!

Peter

Rich
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Rich replied on Thu, Mar 19 2015 5:09 PM

libor:

The problem was cartridge which was clear right after I installed new cartridge and hit play.

Congrats on figuring out your problem.

Peter, very cool of you to lend a hand...er, cartridge!


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