Definitely try all of the simple things you can first. TWL's suggestion is great. I recently solved a grounding problem with my phono stage by simply plugging it in to a different AC source. In my case, it was a bad ground on one of the analog source outlets on a power filter that I use mainly as a gang box for my sources. Through trial and error I solved my issue by plugging the phono into the same AC outlet as my main amp. The difference was amazing.
Of course this happened after checking all of the ground path from the cartridge to the phono stage.
Happy hunting,
Dan
Of course this happened after checking all of the ground path from the cartridge to the phono stage.
Happy hunting,
Dan