On 06/08/2013 09:19, Jens Herrmann wrote:
Hello,
the source selection on the front panel of the Pioneer A-331 has 6
switches of which 4 are temporary switches (source) and 2 are permanent
switches (tape monitor). They have stopped working properly and I was
not able to fix the problem with contact spray this time. Now I want to
replace them but cannot identify the brand and model.

Take a look at
http://img3.fotos-hochladen.net/uplo...woivr6zn0p.jpg
The footprint on the bottom side is a 2x6 dil - 12 contact pins. Note
that it is not possible to use a random model switch with the same
footprint as there is a release mechanism which then would not work
anymore. Thats why the blue knobs have the shape they have.

Regards
Jens

Even robbing a salvaged one is problematic as the plastic body of those
sort of switches can only take the bare minimum of soldering heat before
they start to deform. Can you wire in switches to somewhere that has
more space and can take more conventional switches , assuming you cannot
find an exact replacement. I've burrowed inside similar switches and I
would say they are next to impossible to rebuild, even if you can safely
get them apart with their sub-mm parts