sonavor wrote:

 

CAUTION - This post contains images that some people may find disturbing

Here is the ugly reality.

Indeed shocking and I understand your frustration, doing a perfectly good job, and then a setback like this. But we never give up. Here my idea to retract the plastic tap

Heat the point to about 400°C press it into the plastic, let cool, pull out the tap, heat again pull off the tap and clean the tool

Dillen wrote:

Dip the tonearm tip in boiling water and pull out the remains of the broken socket.

Martin

That will loosen the bond so the plastic mount will come out? So I can do that with a spare arm (like from a beat up 4002 or 4004) to get a replacement mount?

Wow...bummer! This is a sad setback! I have a 4004 where the connector is loose, so it definitely can come out. With regards to reproducing this, I think it is challenging. Maybe a combination of a printed part with a small circuit board that has the right thickness and the 4 connectors on it might do it...I am wondering if one can bend FR4 to the right angle when heating it...

Rudy

Working with the Beogram tonearms removed will require special care to not break the phono cable from the arm to a small board on the tangential arm transport. When I'm ready to remove the tonearm and try the hot water treatment, I'll have to unsolder the wires and pull them through.
Here is where I have traced the phono signal to on the transport board.

A few days back I was complimented on doing a good job on this Beogram project. I mentioned that I couldn't do it without the help of the Beoworld folks that help guide me along the way. Yesterday and today are perfect examples of that. Last night I was stuck trying to figure out the problem with the tracking adjustment when, Jacques sent me a message about it being a belt problem. Sure enough, that was the problem.
Today, I seemingly ran into a giant road block with the tonearm cartridge mount.  Martin stepped in and gave me an amazing tip on removing the plastic cartridge mount insert from the tonearm. Amazing!  ...and a huge thanks!

I had messed around with a Beogram 8000 turntable last year that had a broken phono cable. The plan was to replace the cable but I was stuck with the removal of the plastic cartridge mount. So today, I used that arm to try out Martin's amazing repair tip. Sure enough, after submerging the arm (remove from turntable first 🙂) in a pot of boiling water for a minute or two, I was able pop the cartridge mount right out (using a long screw driver to push from the opposite end).

Here is a picture of the Beogram 8000 tonearm and the cartridge mount removed. I can probably use that piece as a replacement for the Beogram 4000 tonearm or I also have a Beogram 4004 parts unit I could use.

Awesome!! Never give up! What a nail-biter!...;-)

Rudy

I always seem to run into some technical drama on these projects. I guess that is what makes it fun.

Here is a better picture of the Beogram 8000 tonearm cartridge mount. I will try to carefully get the broken one out of the Beogram 4000 later to compare. The mounting assembly is really two pieces.  It looks like it could be a candidate for a 3D part substitute in the future.

Here is the Beogram 8000 cartridge mount opened up into its two, clamshell pieces.

Removing the Beogram 4000 tonearm should be a little easier than I originally thought. Flipping the tangential arm transport over, the cable from the tonearm tranfers from the tiny phono wires to heavier wire for routing out to the mute relay and out to an amplifier. So I can un-solder the tonearm wires there and detach the tonearm from the pivot mount. I will try not to break the phono wires so I can re-use them. It might be inevitable that I will need to change the wires though as it is going to be tricky not damaging them when I push the cartridge mount off the tonearm.

Here's a more detailed shot.