My son has Marshall guitar amplifier that has a valve in the pre-amp section. The amp works well at home but when he uses it at a friends house it emits a loud buzzing which I assume is due to noisy mains. Would a product like the C2 - Smart Filter Duo be likely to reduce this noise?.....(suggested to try and see)
Just to let you know that the C2 seems to have done the trick of removing the buzz (though I haven’t been able to compare the noise with and without the filter but my son is most happy).