I use a REL with a tube amp and lifted the ground on the REL (This model, Q150E, has a switch for that). Humless! I also use a PS Audio Humbuster III on my power amps, so there's that.
Lifting the ground is using a two-prong adapter on the end of your power cord that 'disables' the ground plug. Also, try using a Hum X by Ebtech. You could also try attaching the REL ground wire directly to the chassis of the amp instead of the speaker post.
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