Oh that old post of mine! I had forgotten! The techie was sold thereafter.

I checked every component around that circuit, I even replaced the op-amp, and yes I did play with the resistor too. All to no avail. But you are right, many decks on Youtube do show that defect. At one point I figured this could be an arm lubrication issue, but no, it is not.

Even Martin and Tim could not help, and that is saying a lot!

Wow, still couldn't get to work? Then this definitely a hard one! I will give it a crack and hopefully I can find what is going on. If this circuit worked properly when the table was new it should work properly again. The only thing that could change would be that moving coil or the other two circuits affecting it.

Now that you have used your BG 8000 with the arm dropping the way it is now, have you had any issues with broken stylus or cantilevers due to this fast dropping of the arm? I know it doesn't look good but if it not damaging the cartridge in anyway then maybe it's something I can live with.

I use that one regularly with an SMMC20EN 🙂 

The funny thing is that it doesn't always drop. Sometimes - but seldom - operation is normal. 😕

I just noticed that this schematic in this technical note is different from the circuit in my Beogram 8000 Service manual. Mine has R61 10k ohm resistor between R58 220K resistor and pin 6 of 1IC1. Also the supporting circuit is a little different too. So there seems to be different revision schematics and PCB's.

Well, the technical information brochures are very early versions of circuits. The various service manuals I've come across show the same values as in the production models.

You should not worry too much here.