I originally posted this question in the vintage section with no response, so I'll try here.  I picked up a Master Stereo 600.  I can listen to my tape and cd's in stereo as long as the "stereo" button is depressed.  However, when listening to FM, I cannot depress the "stereo" button, or the audio cuts out.

 I am guessing that means that the mulitplex module/unit is not installed?  What is it?  Can one get it?  I like to listen to FM, and would prefer to hear it in stereo, if possible.

Any advice apprciated!

 

Guy

Guy,

The module was available as an option for those who were able to receive stereo signals (and could afford it).
I don't think I have any spare modules and be prepared to pay a nice little sum if you find one.
Not surprisingly, the owners don't want to part with them.
Note that there are two basic types of MPX modules.
There are exceptions but generally one will fit both
the Beomaster 900 (Master 610) and Beomaster 1000,
the other will fit the Beomaster 1000 but will only work in some Beomaster 900's.

Mounting is fairly easy.
Two large solder points, three screws, one holding a transistor on a heatsink,
one plug out and another in and,
depending on the version of Master 610, also a socket and a lamp is needed (check if the stereo lamp is on when playing tape/phono).

Martin

 

Thank you Martin.  I guess I'll have to do with it the way it is.  I've only once seen a Beomaster 1000 or 900 over here in Canada.  My chances of finding one "beat up" is slim.

 

Guy

So the 610 you have is actually the predecessor of the 900 ?

Yes, the Master 610 is what was later named Beomaster 900K, or at least a very similar build but
I suggest that Beoguy confirms how much is present in his radio first, I am thinking about
the stereo lamp and socket and last but not least the plug for the
stereo decoder. It's a valve socket sitting on the main PCB towards
the right, most likely a pre-emphasis plug is currently mounted
holding only one or two components. Watch out for the tiny coil wires in that area.

Martin

OK: Guy, if you check this out and if it seems a donor BM900 could work i'm almost sure i have 'dead' one somewhere here :).

Thanks guys! 

 

Thanks ipaul!  I wish I could post a pic, but I don't have the equipment right now.  I'd be hard pressed to tell the difference between it and the Beomaster 900k!  I'll take a look inside and let you know what I find.  You name your price for the module, and I'll send it to you!  There's very little chance of me finding one over here in Canada!

 

Martin, I'll check out the PCB board and see what I find. 

 

Guy 

Guy, i'll try to trace the broken 900 and take&post some pics of it's inside so you can compare.

I happen to have a copy of the circuit diagram for the decoder for both the Beomaster 900 and Beomaster 1000, would they be any use??

Thanks for the offer but i think i also have that somewhere...i'm just ending a ''massive'' clean up at home so one of these days i'll have a look but actually one needs the diagram of the 610 decoder also to compare....

Ok...I found some time today to have a look at the guts!  I couldn't fiqure out how to get the back off.  However I did take the back of behind the speakers.  Full of insulation.  I've decided that if I can not fiqure out how to get inside...I have no business being there.  So thank you all for your advice, and I'll enjoy FM without stereo!

 

Guy