Thanks to you all for the advise.

I have tried the Ariel; no change.

So the next step is to spray the transformer: where about is it? Do I need to remove it or can I spray it in situ? And is there any particular lacquer that I need to use?

Phil

Phil,

My last post in response to your comments got lost in the forum running out of capacity, so I will re-state my answer.

The area you say is buzzing is also the area of the power supply and EHT transformer (Extra High Tension) and the buzzing is normally caused by what is known as Eddy currents which are around all magnetic devices such as transformers. The buzzing you are hearing is caused by something loose and so the eddy currents vibrates whatever is loose. In older transformers there was a lot of thin steel plates bolted together to make the laminations and these would come loose and buzz.

When others suggest spraying a transformer, I would suggest this is not a good idea particularly the ETH transformer which generates upwards of 25,000 Volts for the tube anode and arcing can easierly occur.

Also, if there is nothing apparently loose then this may be the first signs of a potential failure if more current than normal is being drawn via a transformer and taking it outside its normal working spec which would also cause a buzzing.

Are you a technical person with some knowledge of TV's like the BeoVision 3, who with direction could make some checks to define the root cause of your problem ?