Well, I've taken the plunge and ordered the components for a rudimentray DIY filter/spike suppressor. I've pretty much used the design from TNT-Audio, changed the flavour of a couple of components but kept the principle pretty much the same. I'm building it in a plug top box which will also become the plug for a mains strip. Shopping list: Motor run 440V 8uF 1 Y2 cap 100000pF 1 X2 cap 0.1uF 1 HV Res 1M 4 Suppressor 250VAC 1 PSU Box Large 1 Open Grommet 1 With a grand total of c. £13, compared to £40 for an RA silencer - how they'll compare would be interesting to see, but I'm too tight to buy a silencer to find out... Hopefully TNT won't mind me re-producing the image here - I'm in no way claiming responsibility for the design attached!