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Beogram 8002 background noise

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ouverture
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ouverture posted on Mon, Sep 9 2019 8:04 PM

just had my 8002 serviced and set it up with my excellent Graham Slee phono pre, listening away to some of my favourite LP's yesterday night and in between tracks I can hear what sounds like a window wiper noise that you would get in your car, I then got my AKG headphones out, and I can hear it even clearer with the headphones, and even during the track, so it is there all the time throughout playing the record, its the same with every record I play, maybe scraping the platter or bearings could be causing it  ?

I read this just now on the site

https://www.beoworld.org/prod_details.asp?pid=307

Have also learned that the 8002 does not have a central bearing like belt driven players, it drives the platter not by a conventional motor, but by a unique tangential-drive system that has no moving parts and no physical contact with the turntable.

Has anyone in the past heard what I'm hearing, and if so how did you fix it,, it's driving me nuts :-) 

 

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sonavor
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Is the floating suspension fully free? By that I mean are all three floating suspension locking screws completely disengaged?

If they are then I would check the subplatter and make sure it isn't rubbing against something. By your description it has to be something related to the platter rotation.

The platter breaking on the Beogram 800x is electronic so if that is somehow a culprit then the fix there is electrical.

-sonavor

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sonavor
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Is the floating suspension fully free? By that I mean are all three floating suspension locking screws completely disengaged?

If they are then I would check the subplatter and make sure it isn't rubbing against something. By your description it has to be something related to the platter rotation.

The platter breaking on the Beogram 800x is electronic so if that is somehow a culprit then the fix there is electrical.

-sonavor

ouverture
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I

have found out that the Beogram 8002 doesn't use a conventional motor with bearings and a shaft.  It has a tangential drive system.

The base platter as shown in the first picture is actually the rotor in the system. 

The transformer looking thing that the rotor circulates around is the stator, so the motor doesn't have any moving parts, clever :-)

NB the base platter (rotor)  can be removed as shown in the second photo, you see the circular compartment for the main bearing, to remove it you loosen the screw that holds the sensor assembly (this sensor reads the tacho disc) and then carefully rotate the arm away clockwise

ouverture
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yes, it is fully free, and subplatter spinning fine, the repeatable nature of the noise does point to platter rotation, let me look at that first

sonavor
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In the photo with the subplatter off you can see your hub unit. The device next to it is a photo sensor that reads the tacho disk.  While you have the subplatter off can you manually (do not run the Beogram 800x turntable with the subplatter removed) rotate that hub and see if anything is hitting? The tachodisk should pass through the sensor without any contact.

-sonavor

ouverture
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Hi John, yes it turns around without any issues, but does not spin as fast as I used to remember, is that a concern do you think, can anything be done to make it spin a little more freely ?

sonavor
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That center hub should spin very easily. Perhaps something is gunked up inside the bearing tube that the center hub shaft fits in. The Beogram 800x Lubrication Chart says for the Turntable Bearing: M4 Oil (modern synthetic is fine) applied to the shaft point and streaked along the length of the shaft. That is sufficient.

You might check out Beolover's blog post from a few years back where he had a problem with a scraping sound on a Beogram 8002.

-sonavor

Dillen
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Dillen replied on Tue, Sep 10 2019 2:03 PM

If the center hub bearing inlay (white nylon part at the bottom) is very worn (or broken - I have seen that), the hub
rides too low and binds inside the bearing.

Martin

ouverture
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its spinning very freely now after I added a little 0.4mm circular shim as per Beolovers blog post, even though I could not hear that my sub platter was scraping, using the shim has allowed me to spin the platter very freely - there is no drag now and it carries on spinning for a long time

sadly the noise is still there in the background, a sort of clunk every second, I will try and record it and put on youtube

 

ouverture
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so this is a quick recording between two tracks, it sounds a bit like your window wipers in the car, hard to describe having a hard time trying to pinpoint where it is coming from, it could still be something not right with the platter

7 second You Tube Clip    https://www.youtube.com/watch?v=oxh-tJ5opHE&feature=youtu.be

 

sonavor
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Interesting. I was half way expecting to hear the sound the platter braking can sometimes make but your sound is more of a scraping. 
What do the stylus and cantilever look like while the record is playing...regarding the suspension of the cartridge?  Do the stylus and cantilever stay firmly above the vinyl or do they appear to bottom out occasionally?

-sonavor

Dillen
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Dillen replied on Tue, Sep 10 2019 6:32 PM

Is the sound consistent with the carriage motor operating?

Martin

ouverture
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the cart should be OK, it has only 10 hours on it, I bought it from Soundsmith, it's an SMMC2 in the wooden box, it looks normal, no bobbing up and down, just to make sure it was not the cart I swapped it over for my hardly ever used MMC1 (for special occasions) , and it is the same background noise, like the wipers are on in your car 

ouverture
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I played a record with the volume knob really low, and I am pretty sure it is the platter slightly coming into contact with the sub platter rotor, I am going to take it all off and put it all back again tomorrow, it seems I was not diligent enough with this in the very beginning :-) 

sonavor
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Yeah, it sounded like scraping.

I would operate the Beogram when you have it in the service position. You will be able to see things better from the sides. The suspension won't be suspended so just make sure you are on a good, sturdy surface that won't get bumped. You can run the Beogram platter motor with the platters in place or just the black sub-platter to check the rotation. Just don't try and operate the platter with the subplatter removed (i.e. only the hub). It doesn't like that...you can blow a fuse.

-sonavor

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