There is something called mu-metal, which is used in shielding magnetic fields and should also work against electrical fields. You can probably find sellers if you perform an internet search. For full effect, you may want to partially wrap one of the components in a sheet of this relatively soft metal, rather than just put a sheet between the amp and preamp. If you wrap, don't forget to provide for component ventilation. Alternatively, for electrical insulation (versus magnetic), a sheet of copper attached to a ground might be adequate and easier to obtain. I have seen some lab applications where a grounded copper screen has been effective, allowing air flow and visual transparency. Good luck.
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