it is a 900K - it has the built in speakers (I also have the external speakers for the M model as I thought they might improve sound quality on mine)
I am getting very good stereo repro which definitely changes to mono when I press the mono button
when I initially plug in the unit and select the fm button the green stereo light comes on for about five minutes then it goes out - then I cannot get it when selecting tape, fm or phono - weird or what?
I am getting good reception with the inbuilt fm aerial (two leads from lh socket go inside the set as per other blog pics)
thanks for your help