The Ebtech Hum-X does work as claimed, but whether it works for your system problems specifically is highly situational, and there's no reliable way to know for sure until you try one or more. You can use a cheater adapter as a cheap advance trial, as described by Newbee, to predict efficacy of the Hum-X in a specific situation, but you may still be wrong.
I have two in each of my systems, on the monoblock tube amplifiers. They eliminated some remaining ground loop noise for which no other practical and safe solution worked but some unsafe and impractical ones did, after other chasing of ground loops produced no further results. Fortunately the Ebtechs are relatively cheap.
Phil
I have two in each of my systems, on the monoblock tube amplifiers. They eliminated some remaining ground loop noise for which no other practical and safe solution worked but some unsafe and impractical ones did, after other chasing of ground loops produced no further results. Fortunately the Ebtechs are relatively cheap.
Phil