[sdiy] Reverb picking up power supply hum

[Scott]

If I mount my power supply (power-one 3 amp) inside my synth cabinet, I pick up some hum in my reverb (tellun neural agonizer).  I've tried grounding the power supply frame to earth.. the reverb tanks to earth..  various grounding schemes using the synths neutral line, etc.  

Is there anything I can do?  There isn't a lot of room but I might be able to fit the p.s. inside a cage if that would help.

I know building a little case for my power supply and leaving it external would work, but that is definitely the last thing I will do.