I feel such a fool!!
On closer inspection i now realise that the noise is coming from the tape player.
When the Bs 7000 is powered up the noise starts for about 5 seconds before the CD or other source is selected is selected.
When tape is selected the noise is continuous.
The tape drawer opens and closes perfectly,but the tape wont play , there is the continuous whirring and the clunking noise as if the tape was about to engage and play but nothing happens the whirring continues though (i have tried other tapes)
When the BS7000 is powered down the whirring continues for about 5 seconds even after the rest of the system appears off and all the lights are out.
Any other help / advice appreciated
Thanks
Fil