"Fuseheads" never rest, do they? Proper isolation for a toroidal transformer, however, does make plenty of sense. The egg crate placement is just a low end version of room treatment and may well be beneficial.
Quick and free fuse tweak
I read about this once but tonight I tried it and was very impressed with the result. More pling from piano, more thwak from slapped acoustic bass, increased detail and space around performers.
Wrap a short piece of cream-colored masking tape once around the glass portion of a regular AC power fuse making sure not to touch the metal caps. I left a millimeter gap.
Wrap a short piece of cream-colored masking tape once around the glass portion of a regular AC power fuse making sure not to touch the metal caps. I left a millimeter gap.