Beomaster 2400: Bass, Treble and Balance Slide Controls

The tone controls and balance sliders of this Beomaster 2400 felt good and appeared to be okay.  Closer inspection of the Bass control slider revealed some suspicious looking contact attachments.
That being the case I opened up the Bass control slider and sure enough the plastic bridge that holds the contacts had broken tabs.

The failing contact mounts on these slider control bridges are present on almost every Beomaster 1900/2400 unit I have encountered so far.

Fortunately Martin Olsen makes replacement bridges that will fix these sliders. I will use another set to restore this Beomaster.

Here are the original and replacement bridges side by side.

Here are the slider contacts installed in the new bridge and the slider all cleaned up.

The Bass slider control put back together.

The Treble and Balance slider controls still had bridges with the mounts for the slider contacts intact.
I went ahead and replaced those bridges with new ones however so the controls would feel the same.

Here is the Tone Control & FM Tuner board with the repaired slider controls re-installed.

The lamp replacements are the next step.  After that this Beomaster should be ready for a bench test.

Beomaster 2400 Type 2902: Tone controls slider bridge repair

A common failure on the Beomaster 1900 and 2400 receivers is with the tone control slider assemblies. Each slider has a left and right channel contact that slide up and down together on a plastic bridge. The contacts are press fitted onto the bridge and held by a plastic post and bar. Over time the plastic bar breaks and the contact comes loose. That results in the slide control no longer working.

Martin Olsen on Beoworld makes replacement slider bridge kits specifically for the Beomaster 1900 and 2400 units. I have used his kit on all of my Beomaster 1900 restorations so far and will continue with this Beomaster 2400 unit. The replacement bridge parts have a beefier bar for the contacts to mount to than the original part.

Here are each of the three tone control sliders disassembled from the tone control board starting from left to right with the Bass slider first.

As you can see the Bass slider has the usual broken tab but it also has a problem where one of the contacts is missing.  I did not see it anywhere in the Beomaster cabinet so it is long gone.  Fortunately I have a spare.

Next is the Treble slider.

Both left and right channel contacts are present with the Treble slider but its slider bridge tabs are broken.

Last is the Balance slider.

The Balance slider has its slider bridge all intact.  I will still replace it along with the Bass and Treble sliders as this slider control is likely to break in the future.  Martin's repair kit comes with three replacement bridges so I will use all of them.

Besides replacing the slider bridge I clean the metal contacts and the rails.
The repair for all three slider control bridges is the same so I will just show one in detail here.

...and here are all three slider controls re-installed on the Beomaster 2400 Tone Control board.