Hi Dan

Welcome to Beoworld.

I have a 7700 in my living room that I rebuilt from parts from 3 others, so I know them pretty well.

This may be stating the obvious, and if so I apologise, but is the scale on the counterweight telling the truth? Get the arm to balance, and turn the counterweight scale to 0.  Then adjust the whole assembly so it reads 1.2  

If you know all about this business, then ignore the above.  Perhaps a photo of the pivot assembly and the arm carrier that sits underneath might give me a clue - maybe something isn't quite seated right...

Hope this helps...

To zero/balance your tonearm look at THIS THREAD - it is for a Beogram RX but the method is exactly the same.

Chris.

Thanks Chris. 🤒

Hi Rayfenwick,

Thank you for replaying so quickly.

This is my first B&O and I am quite an amateur in the world of mechanical techniques.
I bought my 7700 from a 86 year old person who had it from new (1986) but the last 8-10 years he had only used the radio. Maintenance-service has never been done on it. But he claims that the turntable worked fine until he stopped using it.

The issue is that when I try to turn the counterweight, the silvery thing with numbers on it on the tone arm, I can turn it, but when I let it go, it moves back to its original setting ( like it is spring-loaded ). No matter if I move it counter or clock wise.
When I hold the counterweight (the black part) and at the same time turn the silvery dial, then I can move it with some force to any numbers.
Could there be old dried up lubricant that needs to be cleaned out and replaced? Is it possible to take the counterweight apart and clean it?

When I adjust it to +-0, I suppose that the tone arm should be hanging free in a horizontal level. This is not the case, the needle always touches the record. When I try to play a record, there is always the issue that I need to add extra weight on the pick-up and to lightly tap it to stay in the track.

Also many thanks to Chris for the link to an earler thread "balance / zero your tone arm".

/Dan

Hi Dan

The arm on these is quite an interesting design...  the bit of the arm behind the pivot that the counterweight screws on to is actually not the same piece of metal as the rest of the arm - behind the pivot the arm thins dramatically, and the bit of arm that the counterweight goes onto is actually a separate tube, insulated sonically from the rest of the arm by 2 rubber bushes, one inside the rearmost tube, and the other just visible as that black line just behind the pivot point.  I think what's happening is that the lube has dried on your assembly, so that when you try to turn the counterweight you're actually turning the rear of the arm on its rubber bushes.  Same story as for why you can't turn the silver scale against the black weight.

I've done a quick drawing of the assembly.  It's rough, but should give you an idea of how it's put together:

My assembly had the same problem, and I ended up having to rebuild it, as the 'tube' fell off the back of the arm because of bad packaging, and the rest was gummed up with old lubricant.  The unfortunate thing is that I don't have the photos of the procedure anymore...maybe some fellow Beoworlder has a link to some..? 

If you get stuck with it, I can take some photos of mine tomorrow - it's on a shelf and would require relocating to give me rear access, so I can't do it tonight...

Hope this helps

DanP wrote:

Then with a light tap on the tone arm / needle with my finger it "popps" down and stays in this position thru out the whole record, it doesn't skip and the music sounds great (at least in my ears)

This is a classic symptom of a deteriorated stylus suspension - a very common problem with those old MMC cartridges.  You'll either need to have it repaired (e.g. link)  or obtain a replacement (e.g. ).   Or just keep pushing it down till it snaps into place.  But it will fail completely sooner or later.

Hi mediabobny

I don't think it can be stylus suspension preventing the whole arm from 'dropping down'  I'm wondering if the arm isn't correctly seated in the carrier (the grey cradle under the arm that lifts it).  A photo would definitely help, DanP :)

I've had the same problem.  The arm lowers as it should but the stylus remains in its drooped, failed state.  Press down on the tone arm and the stylus will 'pop' into its higher, correct position and play properly.

Thank you for all the information,

I hope these photos show more than i can explain.

To start with: This is my Beocenter 7700. The speakers are two s45-2. All in good condition.

The Problem:
This is the the cartridge with extra weight and before i lightly "tap" it.

This is after I have lightly "taped" the cartridge:

The "Cradle":

The counterweight was stuck... and this what happened today... yes it came lose. Is this good or bad?