[matador]

Hi Guys,

This Beosystem 72-22 thing  did grew up into my mind to the point I got a pair of 8000 to make my own one.

The recent old forum being still unavailable I would like to know if ALL BL8000 are prone to foam rot or if like the 4000 the did change the foam for a better one that do not disintegrate at a certain point? Mine are 12xxxx so 1997 I believe.

Then is there something you can do appart from changing the foam,  I was thinking to insert a fine shit of plastic or whatever cut ti the shape to avoid acid dripping on the electronics.

I know the way to go may be changing the foam but right know I dont feel like opening the speakers.

Thank you for your advices.

Topic

[matador]

Perfect, all I wanted to know.

Thank you Kolfmaker.

I Will update the forum when I’ll do it.

[KolfMAKER]

Don’t worry about de-attaching the front panels and the glue strips holding them.
Obviously, you will first have to remove all screws. After that, the glue strips will hold the speaker driver panel and the PSU/AMP panel in place. The glue strips function as gaskets.

Nevertheless you can push a flat hand screw driver (actually & literally with a flat head), just underneath the panel, and push it up a bit. Do it slow, and as soon as it comes a Biot loose, move the flat head down a few centimeters, and so on.

“In the meantime do you know if not using them will slow down the process (less heat) or as this nothing to do?”

The heat inside the cabinet makes the foam deform. As Long as you do not use them, the process will of foam rot will not continue. Be aware though that the damage might already have been done. Some times, some of the copper tracks on the PSU PCB are eaten away. And sometimes that’s even hard to see with the eye. But this is easy to solve with some by-pass wires.

[matador]

Thank you for the comprehensive answer. Obviously note the one I was wishing the most!

I’m good to open them and what I fear is the glue the seems to hold the front panels.

I’ll do it as soon as I get or make new foam. In the meantime do you know if not using them will slow down the process (less heat) or as this nothing to do?

[KolfMAKER]

Hi Matador,

Foam rot is a serious thing as it can damage the pcb and electronics, causing malfunction, etc.

I am not completely sure about which serial number has the improved foam, but I think 12xx xxxx might still have the old foam.

My advise for proper action is not to apply self cut pieces of plastic. This will not help, because when foam rot is there, it is already damaging the pcb and components. The only way is removing the old foam and thoroughly cleaning the pcb and components.

 

 

 

[Author]

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