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+1 to steel/soft iron shielding .When I was over mixer engineering for Peavey last century, we had lots of powered top box mixer with reverb tanks inside pretty tight packages. Tweaking the power transformer orientation and the tanks for best hum noise result was routinely done. Be aware that tanks are designed to be used in specific orientation wrt spring sag so be careful springs don't bump anything that they shouldn't if used incorrectly. Later when the springs were replaced by digital efx boards, that simplified the hum pickup aspect of the top box designs.JR
+1 to steel/soft iron shielding .
When I was over mixer engineering for Peavey last century, we had lots of powered top box mixer with reverb tanks inside pretty tight packages. Tweaking the power transformer orientation and the tanks for best hum noise result was routinely done. Be aware that tanks are designed to be used in specific orientation wrt spring sag so be careful springs don't bump anything that they shouldn't if used incorrectly.
Later when the springs were replaced by digital efx boards, that simplified the hum pickup aspect of the top box designs.
JR
